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1Z0-540 Oracle VM 2 for x86 Essentials

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1Z0-540 exam Dumps Source : Oracle VM 2 for x86 Essentials

Test Code : 1Z0-540
Test denomination : Oracle VM 2 for x86 Essentials
Vendor denomination : Oracle
: 80 true Questions

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After trying several books, I was quite disappointed not getting the prerogative materials. I was looking for a guideline for exam 1Z0-540 with simple language and well-organized content. killexams.com fulfilled my need, as it explained the knotty topics in the simplest way. In the true exam I got 89%, which was beyond my expectation. Thank you killexams.com, for your august guide-line!


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I occupy been so inclined my entire manner yet I recognize now that I had to gain a bypass in my 1Z0-540 and this may defer me approved likely and confident i am brief of radiance yet passing my tests and solved almost everything questions in just75 mins with killexams.Com dumps. Multiple awesome men cant convey a exchange to planets pass however they could simply will assist you to realise whether or not youve got been the precept fellow who knew a pass to try this and i requisite to be recognized in this international and defer my own unique imprint.


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I got a august finish result with this package. superb first-class, questions are remedy and i got maximum of them on theexamination. After ive handed it, I recommended killexams.com to my colleagues, and absolutely everyone surpassed their assessments, too (a number of them took Cisco assessments, others did Microsoft, VMware, and many others). i occupy no longer heard a dreadful evaluation of killexams.com, so this requisite to be the excellent IT training you may presently locate online.


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I additionally had an excellent revel in with this coaching set, which led me to passing the 1Z0-540 examination with over ninety eight%. The questions are true and valid, and the trying out engine is a super/education tool, even if youre no longer making plans on taking the examination and simply want to increase your horizons and enlarge your know-how. Ive given mine to a friend, who additionally works in this Place however just obtained her CCNA. What I imply is its a notable mastering appliance for every person. And in case you scheme to Take the 1Z0-540 exam, this is a stairway to fulfillment :)


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Clearing 1Z0-540 assessments changed into for everything intents and motive unrealistic for the gain of me. The Take a view atfactors were really extreme for me to recognize. However they illuminated my drawback. I illuminated the 90 inquiries out of one hundred Questions correctly. With the useful resource of essentially relating the Take a view at manual in intellect unload, i used to be organized to view the topics well. Additionally the splendid examination simulator fancy killexams.Com 1Z0-540 With fulfillment cleared this check. I provide gratitude killexams.Com for serving the fantastic administrations. A terrific dealfavored.


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Oracle Oracle VM 2 for

Lenovo ThinkServer methods certified for Oracle VM and Oracle Linux | killexams.com true Questions and Pass4sure dumps

research TRIANGLE PARK, N.C. – September 23, 2013: Lenovo(HKSE: 992) (ADR: LNVGY) these days introduced its ThinkServer rack portfolio is now established and certified with Oracle Linux and Oracle VM. Certification checking out changed into performed the expend of Oracle Linux with the Unbreakable commercial enterprise Kernel, which is optimized for traffic software and hardware. With this certification, Lenovo’s ThinkServer rack portfolio is now capable for working mission-essential and virtualized commercial enterprise Oracle applications and offers consumers a versatile, budget friendly, open requirements-based mostly answer.  Lenovo has furthermore done Oracle Linux ready and Oracle VM ready fame through Oracle PartnerNetwork (OPN). "This certification underscores Oracle’s self faith in their ThinkServer rack portfolio and Lenovo’s commitment in serving purchasers’ facts facilities and the inner most cloud,” mentioned Darrel Ward, vice chairman, enterprise Product neighborhood.  “Lenovo ThinkServer along side Oracle Linux and Oracle VM boost a company’s potential to run company-vital functions and enrich tolerable working efficiency.” The certification procedure helps ensure that clients can edge from the pre-confirmed and licensed options. Having achieved the rigorous trying out guidelines as fraction of Oracle’s Hardware Compatibility listing (HCL) software for Oracle Linux and Oracle VM, Lenovo ThinkServer techniques are capable for deployment in Oracle environments. Lenovo additionally plans to view at various and validate its fresh series of ThinkServer rack servers to fulfill purchasers’ stressful performance ranges for running business-classification enterprise functions. “with the aid of certifying Lenovo’s ThinkServer rack portfolio with Oracle Linux and Oracle VM, their consumers capitalize improved self-possession and option within the infrastructure for his or her traffic functions,” referred to Wim Coekaerts, senior vice chairman, Linux and Virtualization Engineering, Oracle. “collectively Oracle and Lenovo provide consumers with established solutions for concurrent statistics centers and clouds.”

For extra counsel on Lenovo ThinkServer methods which occupy performed Oracle HCL certification, search advice from http://shop.lenovo.com/us/en/servers/thinkserver/rack-servers.html

About Oracle PartnerNetworkOracle PartnerNetwork (OPN) really expert is the newest edition of Oracle's companion program that provides partners with materiel to superior improve, promote and allocate in constrain Oracle solutions. OPN specialized offers components to train and back really superior expertise of Oracle products and options and has evolved to esteem Oracle's starting to be product portfolio, associate base and company opportunity. Key to the newest enhancements to OPN is the capability for partners to differentiate via Specializations. Specializations are performed through competency building, enterprise consequences, talents and confirmed success. To discover extra debate with http://www.oracle.com/partners. About LenovoLenovo (HKSE: 992) (ADR: LNVGY) is a US$34 billion own technology enterprise – the greatest notebook maker in the world and an rising workstation Plus leader – serving clients in more than 160 international locations. dedicated to specially engineered PCs and mobile cyber web contraptions, Lenovo’s traffic is developed on product innovation, a incredibly-productive international deliver chain and robust strategic execution.  formed by pass of Lenovo group’s acquisition of the previous IBM very own Computing Division, the enterprise develops, manufactures and markets reliable, splendid, restful and easy-to-use know-how products and capabilities. Its product strains encompass legendary feel-branded commercial PCs and idea-branded client PCs, in addition to servers, workstations, and a household of cellular cyber web instruments, including pills and sage phones. Lenovo, a global Fortune 500 company, has predominant analysis centers in Yamato, Japan; Beijing, Shanghai and Shenzhen, China; and Raleigh, North Carolina.  For extra tips discern www.lenovo.com. TrademarksOracle and Java are registered emblems of Oracle and/or its affiliates. 


Oracle virtualization 101: setting up Oracle VM Server and manager | killexams.com true Questions and Pass4sure dumps

Oracle might furthermore not be the largest virtualization participant, however its enterprise virtualization product, Oracle VM, is essential...

to set up you probably occupy everything the prerogative accessories.

constructing Oracle virtualization with Oracle VM is fairly straightforward, and you'll promptly build a view at various ambiance to try out the platform. Oracle VM is principally neatly-acceptable for organizations that already run Oracle databases, since the platform makes expend of an Oracle database and Oracle administrators can be extra applicable to manage it. Plus, many agencies want to occupy virtualization items from the equal seller.

Intro to Oracle virtualization

Oracle VM, the Xen-based mostly platform for Oracle virtualization, carries three diverse elements. First you want Oracle VM Server, the latest edition of which is 2.2.2. To maneuver Oracle virtualization, you want Oracle VM supervisor. And if you wish windows virtual machines (VMs) to run smoothly in Oracle VM, you requisite the home windows Paravirtual drivers for Microsoft windows visitors.

which you could download everything these Oracle virtualization accessories for a free verify power from the Oracle application delivery Cloud, so long as you occupy an Oracle account. any person can defer an account at no cost.

installing Oracle VM Server

After downloading the Oracle VM utility, you'll occupy two ZIP data, each containing an ISO. One is for setting up Oracle VM Server, the other is for Oracle VM supervisor. burn every to an setting up CD and then start setting up Oracle VM Server. 

The setting up process for these Oracle virtualization add-ons is simple: To install on server-grade hardware, which you could simply settle for everything defaults and finished the installation. just be confident you are the expend of server-grade hardware with enough RAM to run the entire VMs you want to use, and occupy virtualization aid enabled on the CPU.

installation Oracle VM manager

To install Oracle VM supervisor, you want a Linux server. The current edition helps Oracle commercial enterprise Linux four and better and purple Hat enterprise Linux four and higher. On one of these servers, open a root shell and run the installation script from the Oracle VM supervisor setup CD, for you to deploy Oracle VM supervisor and Oracle Database 10g express version (the backend that shops counsel about VMs).

creating server pools and VMs

once everything the Oracle virtualization utility is allocate in, you should install a server pool for Oracle VM, containing a Server Pool master, a Utility Server and a virtual computer Server. which you could expend your Oracle VM Server for everything these roles, so there’s no should install diverse servers for each assignment. as soon as the Oracle VM supervisor software has accomplished, surge a browser and connect to the OCS web page on the Oracle VM server. The default URL for restful access is https://127.0.0.1:4443/OVS. (also be certain to change the IP address to robust your server’s IP address.)

once you’re connected to the net web page, which you can installation a pool of the entire Oracle VM servers on your infrastructure. Oracle VM supervisor prompts you for this stint after gaining access to the web web page for the first time. just click next to start developing the Oracle VM server pool. You now should provide a denomination to the pool, and if you want, consist of a digital IP handle. After getting into that counsel, click Create to create the server pool. Then, that you may add the Oracle VM servers you've got simply installed. After getting into the entire required parameters, click on Create to comprehensive the pool.

that you may then surge growing VMs. First, upload the ISO information to the Oracle VM server, and then choose ISO information on the materials tab in Oracle VM manager. opt for the digital Machines tab and click Create digital laptop to start growing VMs.


Oracle VM three.2 Now obtainable | killexams.com true Questions and Pass4sure dumps

REDWOOD SHORES, CA--(Marketwire - Jan 22, 2013) - Oracle ( NASDAQ : ORCL )

information information

  • Oracle these days introduced the common availability of Oracle VM free up three.2, a key component in Oracle's computing device to records middle virtualization portfolio, offering better operational efficiency with more desirable ease-of-use, and more automated approaches together with full command-line assist.
  • Oracle VM supervisor now presents unified virtualization administration for Oracle SPARC T-series Servers working Oracle VM Server for SPARC as neatly as x86-based servers working Oracle VM Server for x86.
  • more suitable Operational effectivity and extended Flexibility at a Fraction of the can charge

  • Designed for ease of expend and swift deployment, fresh aspects of Oracle VM 3.2 encompass:
  • Broader deployment decisions
  • In addition to x86 virtualization administration, Oracle VM supervisor can now discover SPARC servers and create and maneuver Oracle VM Server for SPARC domains to permit unified and centralized administration in blended records facilities, improving operational effectivity.
  • Oracle VM supervisor additionally includes MySQL traffic edition for expend because the management repository at no further charge. Oracle VM consumers can now decide to expend Oracle Database commercial enterprise version, Oracle Database normal edition or MySQL enterprise version as the Oracle VM supervisor repository when deploying in creation environments.
  • more advantageous automation and ease-of-use, for greater efficiency in large environments
  • Full command-line assist makes it possible for handy automation: Oracle VM manager Command Line Interface (CLI) supports the equal capabilities as the Oracle VM supervisor browser interface. general initiatives can be scripted and fully automatic, saving time and lowering the risk of human error.
  • automated Oracle VM manager again-up: When the usage of MySQL enterprise edition as the Oracle VM supervisor database, the administration repository is instantly backed-up, permitting quick recuperation of the administration atmosphere if essential.
  • Tag objects for quicker identification of key organizations in huge environments: makes it possible for customized tags to be created and used to filter the view of VMs and servers in the person interface (UI), enabling users to prerogative away identify and act on specific subsets of VMs or servers.
  • "Multi-select" of objects:  allows for users to Take motion on discrete objects in one step for faster operations in huge environments.
  • At-a-look health repute: A health fame tab in the Oracle VM manager UI offers improved and summarized fitness and status reporting on VM information such as memory and CPU usage, allowing for quick identification of concerns before they turn into problems.
  • Direct import of virtual machines into an Oracle VM manager environment: Reduces the variety of steps required to circulation VMs into an Oracle VM manager setting up.
  • Oracle has additionally delivered Oracle VM Server for SPARC three.0, featuring a number important fresh elements corresponding to automated secure are vital migration, vigour management, and dynamic aid management, enabling top of the line-in-class cloud infrastructure capabilities with the Oracle SPARC T-collection servers.
  • With Oracle VM Server for SPARC 3.0, clients can reside migrate Oracle Solaris 10 and Oracle Solaris 11 rational domains simply and securely throughout differing CPU forms, the expend of cpu crypto accelerators, to permit zero downtime cutovers of domains to newer era environments.
  • Oracle VM continues be available as a free down load with zero license cost and world-class enterprise help.
  • helping Quote

  • "With the latest unencumber of Oracle VM, Oracle continues to deliver giant cost-of-ownership and manageability benefits to x86- and now SPARC virtualization administrators," eminent Wim Coekaerts, senior vice president, Linux and Virtualization Engineering, Oracle. "the brand new liberate helps clients unify and automate their environments on a bigger scale to obtain the surest effectivity from their infrastructure."
  • supporting elements

    About Oracle Oracle engineers hardware and application to toil collectively within the cloud and in your records middle. For extra suggestions about Oracle ( NASDAQ : ORCL ), talk over with www.oracle.com

    emblems Oracle and Java are registered trademarks of Oracle and/or its affiliates. different names can be trademarks of their respective owners.


    1Z0-540 Oracle VM 2 for x86 Essentials

    Study guide Prepared by Killexams.com Oracle Dumps Experts


    Killexams.com 1Z0-540 Dumps and true Questions

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    1Z0-540 exam Dumps Source : Oracle VM 2 for x86 Essentials

    Test Code : 1Z0-540
    Test denomination : Oracle VM 2 for x86 Essentials
    Vendor denomination : Oracle
    : 80 true Questions

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    It is august smack for the 1Z0-540 exam. With not much stuff available online, Im elated I got killexams.com. The questions/answers are just great. With killexams.com, the exam was very easy, fantastic.


    try these true test questions for 1Z0-540 examination.
    its far exceptional! I surpassed my 1Z0-540 examination the day prior to this with a nearly best score of 98%. thank youKillexams! The substances in the package are genuine and legitimate - that is what I were given on my other examination. I knew answers to most of the questions, and some extra questions were very similar and on the topics absolutelycovered inside the Take a view at guide, so i used to be capable of solution them on my own. no longer best did i am getting an top notch getting to know device which has helped me expand my professional knowledge, but I furthermore receivedan smooth bypass to my 1Z0-540 certification.


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    After trying several books, I was quite disappointed not getting the prerogative materials. I was looking for a guideline for exam 1Z0-540 with simple language and well-organized content. killexams.com fulfilled my need, as it explained the knotty topics in the simplest way. In the true exam I got 89%, which was beyond my expectation. Thank you killexams.com, for your august guide-line!


    wherein will I discover questions and answers to view at 1Z0-540 exam?
    I occupy been so inclined my entire manner yet I recognize now that I had to gain a bypass in my 1Z0-540 and this may defer me approved likely and confident i am brief of radiance yet passing my tests and solved almost everything questions in just75 mins with killexams.Com dumps. Multiple awesome men cant convey a exchange to planets pass however they could simply will assist you to realise whether or not youve got been the precept fellow who knew a pass to try this and i requisite to be recognized in this international and defer my own unique imprint.


    updated and true examination monetary institution today's 1Z0-540.
    I got a august finish result with this package. superb first-class, questions are remedy and i got maximum of them on theexamination. After ive handed it, I recommended killexams.com to my colleagues, and absolutely everyone surpassed their assessments, too (a number of them took Cisco assessments, others did Microsoft, VMware, and many others). i occupy no longer heard a dreadful evaluation of killexams.com, so this requisite to be the excellent IT training you may presently locate online.


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    I additionally had an excellent revel in with this coaching set, which led me to passing the 1Z0-540 examination with over ninety eight%. The questions are true and valid, and the trying out engine is a super/education tool, even if youre no longer making plans on taking the examination and simply want to increase your horizons and enlarge your know-how. Ive given mine to a friend, who additionally works in this Place however just obtained her CCNA. What I imply is its a notable mastering appliance for every person. And in case you scheme to Take the 1Z0-540 exam, this is a stairway to fulfillment :)


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    Oracle VM 2 for x86 Essentials

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    Oracle VM VirtualBox | killexams.com true questions and Pass4sure dumps

    Oracle VM VirtualBox (formerly Sun VirtualBox, innotek VirtualBox and Sun xVM VirtualBox) is a free and cross-platform virtualization application that provides a family of powerful x86 virtualization tools designed for desktop, server and embedded use. VirtualBox can be used on Linux, Solaris, Mac OS X and Microsoft Windows platforms to run virtual machines of any of the aforementioned operating systems, as well as any BSD distribution, IMB OS/2 flavors, DOS, Netware, L4, QNX, and JRockitVE.

    It's portable

    Oracle VirtualBox is portable, requires no hardware virtualization, includes guest additions and august hardware support. It furthermore features USB device support, full ACPI support, multiscreen resolutions, and built-in iSCSI support. back for PXE network boot, multi-generation branched snapshots, remote machine display, extensible RDP authentication, and USB over RDP (Remote Desktop Protocol) is furthermore integrated in Oracle VirtualBox.

    Supports 32-bit and 64-bit architectures

    At the moment, the program is capable of running only AMD64/Intel64 and x86 architectures. By default, when creating a fresh virtual machine, you will be able to select the operating system that you scheme on virtualizing. Ever since Oracle acquired the Sun Microsystems company, VirtualBox is actively developed by a team of professional engineers who implement fresh features and functionality with every release.

    Virtual machines can be highly customized

    Once a fresh virtual machine has been created in VirtualBox, users will be able to change its type, version, boot order, chipset, pointing device, base remembrance (RAM), processors, video memory, monitor count, audio driver and controller, network adapters, serial and USB ports, and storage devices. When talking about storage devices supported by VirtualBox, they can mention that you will be able expend a virtual CD/DVD image file (also known as ISO image) or expend the host CD/DVD drive for running the virtualized OS.

    The most sophisticated and powerful virtualization software

    Support for USB devices is furthermore a controversial feature of this application, because you will requisite to execute some tweaking before it will toil as intended. But everything in all, this is one of the most sophisticated and powerful virtualization software for Linux operating systems.

    X86 virtualization PC emulator X86 emulator VirtualBox X86 Virtualization PC


    Oracle VM 3.2: Unified Management and Improved Automation Capabilities for x86 and SPARC Servers | killexams.com true questions and Pass4sure dumps

    Jan 29, 2013

    Oracle VM Release 3.2, a key component in Oracle’s desktop to data hub virtualization portfolio, is now available. There are two main themes to the fresh release, Adam Hawley, senior director of desktop and server virtualization product management at Oracle, tells 5 Minute Briefing. One main zone of stress is to provide a richer, more diverse set of deployment options for customers. The second major collection of enhancements is around allowing users to more easily and efficiently manage larger environments.

    In terms of more diverse deployment options, a key fresh capability is that Oracle VM Manager now offers unified virtualization management for Oracle SPARC T-Series Servers running Oracle VM Server for SPARC as well as x86-based servers running Oracle VM Server for x86, improving operational efficiency. “Customers that are using SPARC, or both SPARC and x86 now occupy a sole appliance that they can expend to manage their Oracle VM deployment,” notes Hawley.

    Oracle VM Manager now furthermore includes back for MySQL Enterprise Edition as the management repository at no additional cost. For customers’ ease of use, the fresh back for MySQL Enterprise Edition is included as fraction of the automated install, notes Hawley. Oracle VM customers can now choose to expend Oracle Database Enterprise Edition, Oracle Database gauge Edition or MySQL Enterprise Edition as the Oracle VM Manager repository when deploying in production environments. 

    In terms of expanded back for customers that requisite to manage large environments, the Oracle VM Manager provides a full command line interface (CLI) that supports the same functions as the Oracle VM Manager browser-based interface. This enables common tasks to be scripted and fully automated, saving time and lowering the risk of human error. “Everything you can execute from the browser-based interface you can furthermore now execute from a command line. Whether you are using that to integrate another appliance that you already have, or whether you fancy to create scripts to execute repetitive things fancy creating a VM or adding a server to the environment, you can just create a script against that command line,” says Hawley. “That lowers the tedium of having to click through a browser everything the time but furthermore lowers the risk of human error.”

    For customers that prefer to toil everything through the browser, there is now the faculty for custom tags to be created and used to filter the view of VMs and servers in the user interface (UI). This enables users to quickly identify and act on specific subsets of VMs or servers. There is furthermore the faculty to “multi-select” objects, enabling users to Take action on multiple objects in one step for faster operations in large environments - such as starting or stopping a collection of virtual machines or servers everything together, or live migrating VMs from one server to another.

    In addition, fresh at-a-glance health status home page offers expanded and summarized health and status reporting on VM statistics such as remembrance and CPU usage, allowing for rapid identification of issues before they become problems. Direct import of virtual machines into an Oracle VM Manager environment furthermore reduces the number of steps required to shuffle VMs into an Oracle VM Manager installation.

    “Collectively, everything these things defer it much easier to maneuver and much more efficient and automated to manage large environments, and now with the addition of SPARC, everything those benefits extend over to their SPARC customers,” notes Hawley.

    Oracle VM is available as a free download.

    For more details, retract here. 


    Configuring, implementing rational Domains in Oracle Solaris 10 | killexams.com true questions and Pass4sure dumps

    Jeff Victor, Jeff Savit, Gary Combs, Simon Hayler and Bob Netherton, Prentice Hall publishing

    Solution provider’s takeaway: Determining the best expend of domain roles, relationships and resources in your customer’s Oracle Solaris 10 system requires you to occupy a depth of scholarship of rational Domains. Learn what you requisite to know about Oracle VM Server for SPARC in this chapter excerpt.

    Logical Domains (now Oracle VM Server for SPARC) is a virtualization technology that creates SPARC virtual machines, furthermore called domains. This fresh style of hypervisor permits operation of virtual machines with less overhead than traditional designs by changing the pass guests access physical CPU, memory, and I/O resources. It is pattern for consolidating multiple complete Oracle Solaris systems onto a modern powerful, low-cost, energy-efficient SPARC server, especially when the virtualized systems require the capability to occupy different kernel levels.

    The rational Domains technology is available on systems based on SPARC chip multithreading technology (CMT) processors. These comprise the Sun SPARC Enterprise T5x20/T5x40 servers, Sun Blade T6320/T6340 server modules, and Sun Fire T1000/T2000 systems. The chip technology is integral to rational Domains because it leverages the large number of CPU threads available on these servers. At this writing, that number can be as many as 128 threads in a single-rack unit server and as many as 256 threads in a four-rack unit server. rational Domains is available on everything CMT processors without additional license or hardware cost.

    3.1 Overview of rational Domains Features rational Domains creates virtual machines, usually called domains. Each appears to occupy its own SPARC server. A domain has the following resources:

  • CPUs
  • RAM
  • Network devices
  • Disks
  • Console
  • OpenBoot environment
  • Cryptographic accelerators (optional)
  • The next several sections relate properties of rational Domains and interpret how they are implemented.

    3.1.1 Isolation Each domain runs its own instance of Oracle Solaris 10 or OpenSolaris with its own accounts, passwords, and patch levels, just as if each had its own separate physical server. Different Solaris patch and update levels run at the same time on the same server without conflict. Some Linux distributions can furthermore run in domains. rational Domains back was added to the Linux source tree at the 2.6.23 level.

    Domains are isolated from one another. Thus each domain is individually and independently started and stopped. As a consequence, a failure in one domain— even a kernel panic or CPU thread failure—has no outcome on other domains, just as would be the case for Solaris running on multiple servers.

    3.1.2 Compatibility Oracle Solaris and applications in a domain are highly compatible with Solaris running on a physical server. Solaris has long had a binary compatibility guarantee; this guarantee has been extended to rational Domains, making no distinction between running as a guest or on bare metal. Solaris functions essentially the same in a domain as on a non-virtualized system.

    3.1.3 true and Virtual CPUs One of the distinguishing features of rational Domains compared to other hypervisors is the assignment of CPUs to individual domains. This approach has a dramatic capitalize in terms of increasing simplicity and reducing the overhead commonly encountered with hypervisor systems.

    Traditional hypervisors time-slice physical CPUs among multiple virtual machines in an trouble to provide CPU resources. Time-slicing was necessary because the number of physical CPUs was relatively small compared to the desired number of virtual machines. The hypervisor furthermore intercepted and emulated privileged instructions that would change the shared physical machine’s condition (such as interrupt masks, remembrance maps, and other parts of the system environment), thereby violating the integrity of separation between guests. This process is knotty and creates CPU overhead. Context switches between virtual machines can require hundreds or even thousands of clock cycles. Each context switch to a different virtual machine requires purging cache and translation lookaside buffer (TLB) contents because identical virtual remembrance addresses advert to different physical locations. This scheme increases remembrance latency until the caches become filled with fresh content, only to be discarded when the next time slice occurs.

    In contrast, rational Domains is designed for and leverages the chip multithreading (CMT) UltraSPARC T1, T2, and T2 Plus processors. These processors provide many CPU threads, furthermore called strands, on a sole processor chip. Specifically, the UltraSPARC T1 processor provides 8 processor cores with 4 threads per core, for a total of 32 threads on a sole processor. The UltraSPARC T2 and T2 Plus processors provide 8 cores with 8 threads per core, for a total of 64 threads per chip. From the Oracle Solaris perspective, each thread is a CPU. This arrangement creates systems that are wealthy in dispatchable CPUs, which can be allocated to domains for their exclusive use.

    Logical Domains technology assigns each domain its own CPUs, which are used with endemic performance. This design eliminates the frequent context switches that traditional hypervisors must implement to run multiple guests on a CPU and to intercept privileged operations. Because each domain has dedicated hardware circuitry, a domain can change its state—for example, by enabling or disabling interrupts—without causing a trap and emulation. The assignment of strands to domains can redeem thousands of context switches per second, especially for workloads with lofty network or disk I/O activity. Context switching quiet occurs within a domain when Solaris dispatches different processes onto a CPU, but this is identical to the pass Solaris runs on a non-virtualized server.

    One mechanism that CMT systems expend to enhance processing throughput is detection of a cache miss, followed by a hardware context switch. Modern CPUs expend onboard remembrance called a cache—a very high-speed remembrance that can be accessed in just a few clock cycles. If the needed data is present in remembrance but is not in this CPU’s cache, a cache miss occurs and the CPU must wait dozens or hundreds of clock cycles on any system architecture. In essence, the CPU affected by the cache miss stalls until the data is fetched from RAM to cache. On most systems, the CPU sits idle, not performing any useful work. On those systems, switching to a different process would require a software context switch that consumes hundreds or thousands of cycles.

    In contrast, CMT processors avoid this idle waiting by switching execution to another CPU strand on the same core. This hardware context switch happens in a sole clock cycle because each hardware strand has its own private hardware context. In this way, CMT processors expend what is wasted (stall) time on other processors to continue doing useful work.

    This feature is highly effectual whether rational Domains are in expend or not. Nonetheless, a recommendation for rational Domains is to reduce cache misses by allocating domains so they execute not partake per-core L1 caches. The simplest pass to execute so is to earmark domains with a multiple of the CPU threads per core—for example, in units of 8 threads on T2-based systems. This approach ensures that everything domains occupy CPUs allocated on a core border and not shared with another domain. Actual savings depend on the system’s workload, and may be of minor consideration when consolidating old, behind servers with low utilization.

    3.2 rational Domains ImplementationLogical Domains are implemented using a very small hypervisor that resides in firmware and keeps track of the assignment of rational CPUs, RAM locations, and I/O devices to each domain. It furthermore provides rational channels for communication between domains and between domains and the hypervisor.

    The rational Domains hypervisor is intentionally kept as small as possible for simplicity and robustness. Many tasks traditionally performed within a hypervisor kernel (such as the management interface and performing I/O for guests) are offloaded to special-purpose domains, as described in the next section.

    This scheme has several benefits. Notably, a small hypervisor is easier to develop, manage, and deliver as fraction of a firmware solution embedded in the platform, and its tight focus helps security and reliability. This design furthermore adds redundancy: Shifting functions from a monolithic hypervisor to privileged domains insulates the system from a sole point of failure. As a result, rational Domains occupy a level of resiliency that is not available in traditional hypervisors of the VM/370, z/VM, or VMware ESX style. Also, this design makes it possible to leverage capabilities already available in Oracle Solaris, providing access to features for reliability, performance, scale, diagnostics, progress tools, and a large API set. It has proven to be an extremely effectual alternative to developing everything these features from scratch.

    3.2.1 Domain RolesDomains are used for different roles, and may be used for rational Domain infrastructure or applications. The control domain is an administrative control point that runs Solaris or OpenSolaris and the rational Domain Manager services. It has a privileged interface to the hypervisor, and can create, configure, start, stop, and ruin other domains. Service domains provide virtualized disk and network devices for other domains. I/O domains occupy direct access to physical I/O devices and are typically used as service domains to provide access to these devices. The control domain furthermore is an I/O domain and can be used as a service domain. Applications generally run in guest domains, which are non-I/O domains using virtual devices provided by service domains. The domain structure and the assignment of CPUs are shown in figure 3.1.

    Figure 3.1: Control and Guest Domains

    The definition of a domain includes its name, amount of RAM and number of CPUs, its I/O devices, and any optional hardware cryptographic accelerators. Domain definitions are made by using the command-line interface in the control domain, using the Oracle Enterprise Manager Ops hub product, or for the initial configuration, using the rational Domains Configuration Assistant.

    3.2.1.1 Domain RelationshipsEach server has exactly one control domain, establish on the instance of Solaris that was first installed on the system. It runs rational Domain Manager services, which are accessed by a command-line interface provided by the ldm command. These rational Domain Manager services comprise a “constraint manager” that decides how to allocate physical resources to fill the specified requirements (the “constraints”) of each domain.

    There can be as many I/O domains as there are physical PCI buses on the system. An I/O domain is often used as a service domain to run virtual disk services and virtual network switch services that provide guest domain virtual I/O devices.

    Finally, there can be as many guest domains as are needed for applications, theme to the limits associated with the installed capacity of the server. At the time of this writing, the maximum number of domains on a CMT system was 128, including control and service domains, even on servers with 256 threads such as the T5440. While it is possible to run applications in control or service domains, it is highly recommended, for stability reasons, to run applications only in guest domains. Applications that require optimal I/O performance can be run in an I/O domain to avoid virtual I/O overhead, but it is recommended that such an I/O domain not be used as a service domain.

    A simple configuration consists of a sole control domain furthermore acting as a service domain, and some number of guest domains. A more knotty configuration could expend redundant service domains to provide failover in case of a domain failure or loss of a path to an I/O device.

    3.2.2 Dynamic ReconfigurationCPUs and virtual I/O devices can be dynamically added to or removed from a rational Domain without requiring a reboot. An Oracle Solaris instance running in a guest domain can immediately defer expend of a dynamically added CPU for additional capacity and can furthermore maneuver the removal of everything but one of its CPUs. Virtual disk and network resources can furthermore be nondisruptively added to or removed from a domain, and a guest domain can defer expend of a newly added virtual disk or network device without a reboot.

    3.2.3 Virtual I/OLogical Domains technology abstracts underlying I/O resources to virtual I/O. It is not always possible to give each domain direct access to a bus, an I/O remembrance mapping unit (IOMMU), or devices, so rational Domains provides a virtual I/O (VIO) infrastructure to provide access to these resources.

    Virtual network and disk I/O is provided to rational Domains by service domains. A service domain runs Solaris and usually has direct connections to a PCI bus connected to physical network and disk devices. In that configuration, it is furthermore an I/O domain. Likewise, the control domain is typically configured as a service domain. It is furthermore an I/O domain, because it requires access to I/O buses and devices to boot up.

    The virtual I/O framework allows service domains to export virtual network and disk devices to other domains. Guest domains expend these devices exactly as if they were dedicated physical resources. Guest domains accomplish virtual I/O to virtual devices provided by service domains. Service domains then proxy guests’ virtual I/O by performing I/O to back-end devices, which are usually physical devices. Virtual device characteristics are described in detail later in this chapter.

    Guest domains occupy network and device drivers that communicate with I/O domains through rational Domain Channels (LDCs) provided by the hypervisor. The addition of device drivers that expend LDCs rather than physical I/O is one of the areas in which Solaris has been modified to run in a rational domain—, an sample of paravirtualization discussed in Chapter 1, “Introduction to Virtualization.” LDCs provide communications channels between guests, and an API for enqueuing and dequeuing messages that accommodate service requests and responses. figure 3.2 shows the relationship between guest and service domains and the path of I/O requests and responses.

    Figure 3.2: Service Domains Provide Virtual I/O

    Shared remembrance eliminates the overhead associated with copying buffers between domains. The processor’s remembrance mapping unit (MMU) is used to map shared buffers in physical remembrance into the address spaces of a guest and an I/O domain. This strategy helps implement virtual I/O efficiently: Instead of copying the results of a disk read from its own remembrance to a guest domain’s memory, an I/O domain can read directly into a buffer it shares with the guest. This highly secure mechanism is controlled by hypervisor management of remembrance maps.

    I/O domains are designed for lofty availability. Redundant I/O domains can be set up so that system and guest operation can continue if a path fails, or if an I/O domain fails or is taken down for service. rational Domains provides virtual disk multipathing, thereby ensuring that a virtual disk can remain accessible even if a service domain fails. Domains can expend IP network multipathing (IPMP) for redundant network availability.

    3.3 Details of Domain ResourcesLogical Domains technology provides elastic assignment of hardware resources to domains, with options for specifying physical resources for a corresponding virtual resource.

    3.3.1 Virtual CPUsAs mentioned in the section “Real and Virtual CPUs,” each domain is assigned exclusive expend of a number of CPUs, furthermore called threads or strands. Within a domain, these are called virtual CPUs (vCPUs).

    The granularity of assignment is a sole vCPU. A domain can occupy from one vCPU up to everything the vCPUs on the server. On UltraSPARC T1 systems (T1000 and T2000), the maximum is 8 cores with 4 threads, for a total of 32 vCPUs. On UltraSPARC T2 and T2 Plus systems, the maximum is 8 cores with 8 threads each, for a total of 64 vCPUs per chip. Systems with the T2 Plus chip can occupy multiple chips per server: The T5140 and T5240 servers occupy 2 T2 Plus chips for a total of 16 cores and 128 vCPUs, while the T5440 has 4 T2 Plus chips with 32 cores and 256 vCPUs.

    Virtual CPUs should be assigned to domains on core boundaries. This strategy prevents “false cache sharing,” which can reduce performance when multiple domains partake a CMT core and compete for the same L1 cache. To avoid this problem, vCPU quantities equivalent to entire cores to each domain should be allocated. For example, you should earmark vCPUs in units of 8 vCPUs on T2 and T2 Plus servers. Of course, this tactic may be overkill for some workloads, and administrators requisite not excessively concern themselves when defining domains to accommodate the light CPU requirements needed to consolidate small, old, or low utilization servers. figure 3.3 is a simplified diagram of the threads, cores, and caches in a SPARC CMT chip.

    The number of CPUs in a domain can be dynamically and nondisruptively changed while the domain is running. Oracle Solaris commands such as vmstat and mpstat can be used within the domain to monitor its CPU utilization, just as on a dedicated server. The ldm list command can be used in the control domain to pomp each domain’s CPU utilization. A change in the quantity of vCPUs in a running domain takes outcome immediately. The number of CPUs can be managed automatically with the rational Domains Dynamic Resource Manager, which is discussed later in this chapter.

    Figure 3.3: CMT Cores, Threads, and Caches

    3.3.2 Virtual Network DevicesGuests occupy one or more virtual network devices connected to virtual Layer 2 network switches provided by service domains. Virtual network devices can be on the same or different virtual switches so as to connect a domain to multiple networks, provide increased availability using IPMP (IP Multipathing), or increase the bandwidth available to a guest domain.

    From the guest perspective, virtual network interfaces are named vnetN, where N is an integer starting from 0 for the first virtual network device defined for a domain. In fact, the simplest pass to determine if an Oracle Solaris instance is running in a guest domain (specifically, a domain that is not an I/O domain) is to issue the command ifconfig –a and discern if the network interfaces are vnet0, vnet1, and so on, rather than true devices fancy nxge0 or e1000g0. Virtual network devices can be assigned static IP or dynamic IP addresses, just as with physical network devices.

    3.3.2.1 MAC AddressesEvery virtual network device has its own MAC address. This is different from Oracle Solaris Containers, where a sole MAC address is usually shared by everything Containers in a Solaris instance. MAC addresses can be assigned manually or automatically from the reserved address range of 00:14:4F:F8:00:00 to 00:14:4F:FF:FF:FF. The bottom half of the address range is used for automatic assignments; the other 256K addresses can be used for manual assignment.

    The rational Domains manager implements duplicate MAC address detection by sending multicast messages with the address it wants to allocate and listening for a possible response from another machine’s rational Domains manager epigram the address is in use. If such a message comes back, it randomly picks another address and tries again. The message time-to-live (TTL) is set to 1, and can be changed by the SMF property ldmd/hops. Recently freed MAC addresses from removed domains are used first, to capitalize obviate DHCP servers from exhausting the number of addresses available.

    3.3.2.2 Network ConnectivityVirtual switches are usually assigned to a physical network device, permitting traffic between guest domains and the network segment to which the device is connected. Network traffic between domains on the same virtual switch does not travel to the virtual switch or to the physical network, but rather is implemented by a quick memory-to-memory transfer between source and destination domains using dedicated LDCs. Virtual switches can furthermore be established without a connection to a physical network device, which creates a private secure network not accessible from any other server. Virtual switches can be configured for securely isolated VLANs, and can exploit features such as VLAN tagging and jumbo frames.

    3.3.2.3 Hybrid I/ONetwork Interface Unit (NIU) Hybrid I/O is an optimization feature available on servers based on the UltraSPARC T2 chip, the T5120 and T5220 servers, and the Sun Blade T6320 server module. It is an exception to the routine rational Domains virtual I/O model, and provides higher performance network I/O. In hybrid mode, DMA resources for network devices are loaned to a guest domain so it can accomplish network I/O without going through an I/O domain. In this mode, a network device in a guest domain can transmit unicast traffic to and from external networks at essentially endemic performance. Multicast traffic, and network traffic to other domains on the same virtual switch are handled as described above.

    In current implementations, there are two 10 GbE NIU nxgeN devices per T2- based server. Each can back three hybrid I/O virtual network devices, for a total of six.

    3.3.3 Virtual DiskService domains can occupy virtual disk services that export virtual cache devices to guest domains. Virtual disks are based on back-end disk resources, which may be physical disks, disk slices, volumes, or files residing in ZFS or UFS file systems. These resources could comprise any of the following:

  • A physical cache device (disk or LUN)—for example, /dev/dsk/c1t48d0s2
  • A slice of a physical device or LUN—for example, /dev/dsk/c1t48d0s0
  • A disk image file residing in UFS or ZFS—for example, /path-to-filename
  • A ZFS volume—for example, zfs create -V 100m ldoms/domain/test/zdisk0 creates the back-end /dev/zvol/dsk/ldoms/domain/test/zdisk0
  • A volume created by Solaris Volume Manager (SVM) or Veritas Volume Manager (VxVM)
  • A CD ROM/DVD or a file containing an ISO image
  • A virtual disk may be marked as read-only. It furthermore can be made exclusive, meaning that it can be given to only one domain at a time. This setting is available for disks based on physical devices rather than files, but the same outcome can be provided for file back-ends by using ZFS clones. The advantages of ZFS—such as advanced mirroring, checksummed data integrity, snapshots, and clones—can be applied to both ZFS volumes and disk image files residing in ZFS. ZFS volumes generally provide better performance, whereas disk image files provide simpler management, including renaming, copying, or transmission to other servers.

    In general, the best performance is provided by virtual disks backed by physical disks or LUNs, and the best flexibility is provided by file-based virtual disks or volumes, which can be easily copied, backed up, and, when using ZFS, cloned from a snapshot. Different kinds of disk back-ends can be used in the same domain: The system volume for a domain can expend a ZFS or UFS file system back-end, while disks used for databases or other I/O intensive applications can expend physical disks.

    Redundancy can be provided by using virtual disk multipathing in the guest domain, with the same virtual disk back-end presented to the guest by different service domains. This provides failing tolerance for service domain failure. A timeout interval can be used for I/O failover if the service domain becomes unavailable. The ldm command syntax for creating a virtual volume lets you specify an MPXIO group. The following commands illustrate the process of creating a disk volume back-end served by both a control domain and an alternate service domain:

    # ldm add-vdsdev mpgroup=foo \/path-to-backend-from-primary/domain ha-disk@primary-vds0# ldm add-vdsdev mpgroup=foo \/path-to-backend-from-alternate/domain ha-disk@alternate-vds0# ldm add-vdisk ha-disk ha-disk@primary-vds0 myguest

    Multipathing can furthermore be provided from a sole I/O domain with multiplexed I/O (MPXIO), by ensuring that the domain has multiple paths to the same device—for example, two FC-AL HBAs to the same SAN array. You can enable MPxIO in the control domain by running the command stmsboot -e. That command creates a single, but redundant path to the same device. The sole device is then configured into the virtual disk service. Perhaps most simply, insulation from a path or media failure can be provided by using a ZFS file pool with mirror or RAID-Z redundancy. These methods present resiliency in case of a path failure to a device, but execute not insulate the system from failure of a service domain.

    3.3.4 Console and OpenBootEvery domain has a console, which is provided by a virtual console concentrator (vcc). The vcc is usually assigned to the control domain, which then runs the Virtual Network Terminal Server daemon (vntsd) service.

    By default, the daemon listens for localhost connections using the Telnet protocol, with a different port number being assigned for each domain. A guest domain operator connecting to a domain’s console first logs into the control domain via the ssh command so that no passwords are transmitted in cleartext over the network; the telnet command can then be used to connect to the console.

    Optionally, user domain console authorization can be implemented to restrict which users can connect to a domain’s console. Normally, only system and guest domain operators should occupy login access to a control domain.

    3.3.5 Cryptographic AcceleratorThe processors in CMT systems are equipped with on-chip hardware cryptographic accelerators that dramatically hurry up cryptographic operations. This technique improves security by reducing the CPU consumption needed for encrypted transmissions, and makes it possible to transmit secure traffic at wire speed. Each CMT processor core has its own hardware accelerator unit, making it possible to run multiple concurrent hardware-assisted cryptographic transmissions.

    In the T1 processor used on the T1000 and T2000 servers, the accelerator performs modular exponentiation and multiplication, which are normally CPU-intensive portions of cryptographic algorithms. The accelerator, called the Modular Arithmetic Unit (MAU), speeds up public key cryptography (i.e., RSA, DSA, and Diffie-Hellman algorithms).

    Although the T2 and T2 Plus chips comprise this function, the accelerator has additional functionality. This cipher/hash unit accelerates bulk encryption (RC4, DES, 3DES, AES), secure hash (MD5, SHA-1, SHA-256), other public key algorithms (elliptical curve cryptography), and error-checking codes (ECC, CRC32).

    At this time, a cryptographic accelerator can be allocated only to domains that occupy at least one virtual CPU on the same core as the accelerator.

    3.3.6 MemoryThe rational Domains technology dedicates true remembrance to each domain, instead of using virtual remembrance for guest address spaces and swapping them between RAM and disk, as some hypervisors do. This approach limits the number and remembrance size of domains on a sole CMT processor to the amount that fits in RAM, rather than oversubscribing remembrance and swapping. As a consequence, it eliminates problems such as thrashing and double paging, which are experienced by hypervisors that run virtual machines in virtual remembrance environments.

    RAM can be allocated to a domain in highly granular units—the minimum unit that can be allocated is 4 MB. The remembrance requirements of a domain running the Oracle Solaris OS are no different from running Solaris on a physical machine. If a workload needs 8 GB of RAM to run efficiently on a dedicated server, it will requisite the same amount when running in a domain.

    3.3.7 Binding Resources to DomainsThe rational Domains administrator uses the ldm command to specify the resources required by each domain: the amount of RAM, the number of CPUs, and so forth. These parameters are sometimes referred to as the domain’s constraints.

    A domain that has been defined is said to be dormant until resources are bound to it by the ldm bind command. When this command is issued, the system selects the physical resources required by the domain’s constraints and associates them with the domain. For example, if a domain requires 8 CPUs, the domain manager selects 8 CPUs from the set of online and unassigned CPUs on the system and gives them to the domain.

    Until a domain is bound, the sum of the constraints of everything domains can exceed the physical resources available on the server. For example, one could define 10 domains, each of which requires 8 CPUs and 8 GB of RAM on a machine with 64 CPUs and 64 GB of RAM. Only the domains whose constraints are met can be bound and started. In this example, the first 8 domains to be bound would boot. Additional domains can be defined for occasional or emergency purposes, such as a disaster recovery domain defined on a server normally used for testing purposes.

      Oracle VM Server for SPARC

    Configuring, implementing rational Domains in Oracle Solaris 10

    Creating, viewing and installing Oracle Solaris 10 into a domain

    Logical Domains migration tips for VARs in Oracle Solaris 10

    This excerpt is from the book, ‘Oracle Solaris 10 System Virtualization Essentials’ by Jeff Victor, Jeff Savit, Gary Combs, Simon Hayler, Bob Netherton, published by Pearson/Prentice Hall Professional, Sept. 2010, ISBN 0-13-708188-X, Copyright 2011; for a complete list of contents, gladden visit the publisher site: www.informit.com/title/013708188X.



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