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HP0-058 Configuration and Management of HP Integrity Mid-range Servers

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HP0-058 exam Dumps Source : Configuration and Management of HP Integrity Mid-range Servers

Test Code : HP0-058
Test appellation : Configuration and Management of HP Integrity Mid-range Servers
Vendor appellation : HP
: 137 actual Questions

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HP Configuration and Management of

HP Helps businesses pressure Down the expenses and Complexity of computer Configuration management | killexams.com actual Questions and Pass4sure dumps

HP focus East today announced enhancements to its entry-priced personal computer (computing device) hardware and utility configuration management solution.Designed to greatly gash back the costs and complexity of managing PCs, the greater HP OpenView customer Configuration supervisor 2.0 offers medium-sized enterprises or departments inside larger companies with a official, handy-to-use and superb value laptop configuration management solution. The new version offers tremendous new manageability elements across multi-vendor, home windows-primarily based client products and supports HP thin valued clientele.moreover, HP announced that for the primary time each and every trade HP laptops, desktops, and workstations will start transport with a pre-loaded HP OpenView Configuration management agent to assist additional drive down workstation manageability expenses.enhanced manageability with low cost improve pathHP OpenView client Configuration supervisor offers IT directors a brief-to-deploy solution with maximum out-of-the-container performance, including discovery and inventory, working gear deployment and migration, patch administration, application deployment, software usage metering, far flung manage and HP hardware configuration management.HP OpenView customer Configuration manager helps windows-primarily based desktops, notebooks, workstations and HP thin purchasers.  New and more advantageous manageability facets consist of:• HP hardware administration – built-in management capabilities for HP hardware, including BIOS (primary enter/output system) settings management, computerized BIOS and driver updates, alert monitoring and power management• operating gear photo deployment – for remotely deploying and migrating working programs• person environment migration – providing automated seize and deployment of working equipment, applications and person settings between diverse PCs or working systems• application utilization metering – enabling IT to precisely tune application utilization across the trade to optimise utility licensing charges• Integration with HP ProtectTools -- for remotely initialising embedded relied on Platform Module chips and remotely deploying and managing the HP ProtectTools application software• elevated scalability – offering twice the scalability of the old-fashioned versionIn addition, a free add-on to HP OpenView client Configuration supervisor gives wait on for Intel’s energetic management expertise (AMT), enabling valued clientele to hold abilities of potent new faraway management and diagnostics capabilities constructed into PCs with Intel vPro expertise. considering the brand new capabilities offered by artery of Intel’s AMT expertise are based mostly in hardware and firmware, HP OpenView can present technicians this performance besides the fact that a pc is powered off, its OS is down, or its application brokers are missing. These capabilities enable IT administrators to improve the effectivity of uphold desk features, shift greater workload off-hours when it received’t tamper with users productivity, and carry simple more desirable provider-stage fine.HP OpenView customer Configuration manager furthermore helps to lower the barriers of entry for shoppers to start the adventure against fitting an adaptive commercial enterprise by artery of offering an effortless migration route to different, extra absolutely featured and tremendously automated and scalable options in the HP OpenView Configuration management portfolio. by using offering a robust basis for future necessities, the respond permits valued clientele who vicinity a premium on brief time-to-price and ease-of-use to invest in the entry-priced offering these days and price-with no vicissitude upgrade as their needs develop and evolve.Pre-loaded brokers speeds up time-to-valueHP additionally introduced that an HP OpenView Configuration administration agent will now arrive pre-loaded on each and every commercial HP laptops, desktops and workstations. The pre-loaded agent reduces the charges associated with managing PCs with the aid of casting off the time spent by means of IT administrators to deploy brokers on machines prior to managing them.The pre-loaded agent permits shoppers to directly hold odds of the free-of-can impregnate HP OpenView customer Configuration supervisor fundamental edition to instantly notice HP gadgets and fulfill hardware administration operations on HP customer-primarily based items. basic version clients can seamlessly upgrade the software to HP OpenView client Configuration supervisor top class version to hold abilities of the total latitude of hardware and utility management functionality provided via the answer.greater assistance about the HP OpenView customer Configuration supervisor and HP OpenView management software is obtainable at www.hp.com/go/openview.About HPHP is a expertise solutions issuer to patrons, agencies and institutions globally. The business’s offerings span IT infrastructure, global capabilities, enterprise and home computing, and imaging and printing. For the four fiscal quarters ended Oct. 31, 2006, HP salary totaled $ninety one.7 billion. more counsel about HP (NYSE, Nasdaq: HPQ) is accessible at www.hp.com.About HP focus EastHP is the biggest expertise and options company in the core East with 670 employees and subsidiaries in Dubai, Abu Dhabi, Riyadh, Jeddah, Khobar, Cairo,  Ramallah and Oman servicing the GCC, Egypt and the Levant. HP has been current within the focus East due to the fact 1968 and opened its first regional workplace in 1994. HP middle East is the market leader for commercial enterprise, miniature and medium enterprise and client expertise products and presents a immense portfolio of solutions and capabilities in quite a few enterprise domains.extra advice about HP within the middle East is available at www.hp.com/me


community Configuration and alter administration Market: global industry evaluation, size, Share, boom, tendencies, and Forecasts 2016–2024 | killexams.com actual Questions and Pass4sure dumps

The community configuration and the change management is an automatic expertise that helps in preserving the system against the interruptions that are led to through the configuration adjustments.

This press unencumber turned into orginally distributed by SBWire

Sarasota, FL -- (SBWIRE) -- 01/25/2017 -- international community Configuration and alter administration Market: Overview

The network configuration and the change administration is an automated expertise that helps in protecting the gear against the interruptions which are led to by artery of the configuration changes. in the concurrent years, it has whirl into very complicated to exploit the network infrastructures and the instruments which are connected to it. With the aid of community configuration and the alternate administration, the administration of gigantic complicated network infrastructures has whirl into effortless for the enterprise devices. The network configuration and the exchange administration augment the management of the network, secure and prepare the vital facts, gash back the charge, store time, and regain rid of the human intervention. The telecom providers own modified tremendously as they've upgraded their networks from 2G to 3G and now the trend is of LTE/4G. The deployment of those technologies includes the wait on of the network management options on the again conclusion.

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global network Configuration and alter administration Market: Segmentation

The international community configuration and the change management market is segmented on the foundation of the add-ons, deployment mode, near clients, verticals and the regions. On the basis of the accessories, the world community configuration and the change management market is split into two types: software and services. in line with the deployment mode, the global market is segregated into on premise and on demand. On the basis of the end-clients, the world market is categorised into miniature and medium organizations and immense organizations. The quite a few verticals of the global market are segregated are schooling, IT and telecom, energy, BFSI, healthcare, government and others. The a number of regions of the global network configuration and the trade management market comprehend Europe, the middle East and Africa, North america, Latin the us and Asia Pacific.

world community Configuration and change administration Market: boom factors

The components which are riding the international network configuration and the exchange management market are the evolving infrastructures of the community, the complexity of the networks, increasing heterogeneity and the exact for the requirement of the automated solutions for the network administration and configuration. At present, the community configuration and the trade administration own addressed each and every of the challenges of the network configuration it's automatic and has reduced the downtime of the networks, which in flip saves the components of the IT companies and reduces the losses that are incurred owing to the community outrages. The factor of impregnate reduction is a immense component it truly is driving the global market increase, because the simple configuration management turned into costly. The addition of the brand new gadgets and the applied sciences owing to the tall trade demands is one of the factors triggering the world market.

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global network Configuration and alter administration Market: Regional analysis

each zone is transforming into in terms of industrialization and different groups. These each and every sectors involve with the community configuration and the change management and hence every region is attempting to undertake the new know-how to enrich their economies. amongst these, North the united states and Europe are the biggest markets in terms of the revenue contribution. The different regions equivalent to Asia-Pacific, Latin america and the middle East and Africa are furthermore experiencing a benign impress within the global market.

world network Configuration and alter administration Market: competitive players

The primary market gamers in the international community configuration and the alternate administration market are Cisco, HP, EMC, IBM, SolarWinds, Alter factor, Netcordia, Uplogix, IPswitch, NetBrain technologies, control Engine, Dorado utility, CA technologies and Quest software.

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global network Configuration and change management Market: Regional segment analysis

North AmericaU.S.EuropeGermanyFranceUKAsia PacificChinaJapanIndiaLatin AmericaBrazilMiddle East & Africa

What file offers

Full in-depth evaluation of the father or mother marketImportant changes in market dynamicsSegmentation details of the marketFormer, on-going, and projected market analysis when it comes to volume and valueAssessment of zone of interest industry developmentsMarket partake analysisKey innovations of fundamental playersEmerging segments and regional marketsTestimonials to organizations with a purpose to improve their foothold in the market

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community administration and configuration software market set to develop in keeping with forecasts | killexams.com actual Questions and Pass4sure dumps

The record offers a fundamental overview of the community management and Configuration software industry including definitions, preparations, purposes and trade chain constitution.

The world community administration and Configuration utility Consumption 2016 Market analysis file is a professional and in-depth examine on the existing condition of the community management and Configuration software market.

First, the report provides a simple overview of the network administration and Configuration application trade together with definitions, classifications, purposes and trade chain structure. And pile guidelines and plans are mentioned as well as manufacturing methods and value structures.

access sample file @: www.itintelligencemarkets.com/requ…mple.php?id=1104

The file gives main records on the condition of the trade and is a positive source of suggestions and path for corporations and people drawn to the market.

software or computing device application is a component of the laptop gadget that comprises desktop instructions or facts, in immense divergence to the actual hardware from which the system is finally built. In software engineering and computer science, computer software is really the each and every of the counsel which is processed by using the statistics, programs, and laptop methods.

computer software comprises libraries, computing device classes, and other non-executable data equivalent to digital media or online documentation. desktop software and hardware are relative on each and every other and neither of them can live used realistically on their own.

on the lower most stage, executable code includes desktop language guidelines Definite to an individual processor, notably a primary processing unit or CPU. numerous utility are programmed in written in tall smooth programming languages that are effortless and efficient for software programmers.

excessive smooth languages are for that understanding translated into machine language employing an interpreter or a compiler or an amalgamation of each of them. youngsters, application could furthermore live written in low stage assembly language which is ultimately translated into machine language using an assembler.

Most favorite avid gamers available in the market comprehend CA applied sciences, HP, IBM, NetScout systems, Alcatel-Lucent, BMC software, Compuware, ERICSSON

The primary areas below focus of attention within the analysis record are Asia Pacific, North america, Latin america, Europe, and the focus East and Africa. The components affecting the market in these areas had been meticulously analyzed and redeem forth within the e-book.

despite the fact, the main of the document might live on China and different international locations within the Asia Pacific area. The analyze further scrutinizes each condition in terms of net salary, demanded extent, and scope for boom.

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The analysis record delves abysmal in the boom trajectory of the global network administration and configuration application consumption 2016 market research file market in order to supply useful insights to reader for realizing the constitution of the market more suitable. The international community management and configuration utility consumption 2016 market research record market will furthermore live for this understanding classified on the basis of near clients, uncooked substances, items, applications, and regions.

different traits that can furthermore negatively or positively own an outcome on the augment of the international community management and configuration software consumption 2016 market research file market own additionally been measured in the report.

desk of Contents

international network administration and Configuration software CONSUMPTION Market analysis file

Chapter 1 network administration and Configuration application CONSUMPTION Market Overview

Chapter 2 international fiscal own an repercussion on on trade

Chapter 3 global Market competitors by means of producers

Chapter 4 international construction, earnings (value) with the aid of location

Chapter 5 international supply (creation), Consumption, Export, Import with the aid of regions

Chapter 6 international creation, revenue (value), rate style by means of type

Chapter 7 global Market analysis with the aid of application

Chapter eight Manufacturing impregnate evaluation

Chapter 9 Industrial Chain, Sourcing strategy and Downstream patrons

Chapter 10 marketing strategy evaluation, Distributors/traders

Chapter 11 Market repercussion components evaluation

Chapter 12 world network administration and Configuration software CONSUMPTION Market Forecast

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Configuration and Management of HP Integrity Mid-range Servers

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Data Maintained by the Management Processor | killexams.com actual questions and Pass4sure dumps

This chapter is from the engage 

HP nPartition severs accommodate one energetic management processor (MP). The MP is answerable for a variety of tasks; the most notable are the following:

  • maintaining the configuration of the entire complex
  • allowing access to the console and console logs for each nPartition
  • storing the chassis and event logs
  • providing a command menu for performing actions on the complex
  • presenting the virtual front panel (VFP) interface
  • The remains of this section focuses on how the management processor maintains the configuration of the nPartitions, cells, and other configuration aspects of HP nPartition servers. The configuration data for HP nPartition servers is stored on the MP. The MP provides an interface for management applications such that administrators may configure the complex. Understanding the basics of how the data is stored on the MP provides grand insights into HP nPartition server administration, configuration, and troubleshooting. Three primary data structures are stored on the MP: stable intricate configuration data (SCCD), dynamic configuration data (DCD), and partition configuration data (PCD).

    The SCCD structure contains several crucial pieces of data involved in the management of nPartitions. Most important, the SCCD contains the mapping of cells to nPartitions in the cell assignments array. Changes to a complex's configuration such as adding or removing cells from an nPartition are achieved by modifying the SCCD data structure. Table 4-2 lists the most notable fields in the SCCD data structure and their relevance to nPartition management.

    Table 4-2. Key Fields in SCCD Data Structure

    Field in SCCD

    Importance

    Cell Assignments Array

    This realm is an array with an constituent for each cell. The value contained in each array index indicates the partition ID to which the cell is assigned.

    Complex Name

    This realm is the descriptive appellation of the complex.

    Serial Number

    The serial number is a read-only value representing the serial number of the entire complex.

    Cell Type

    This realm determines whether the cell is to live used as a base cell (default) or floating cell. Currently only base cell types are supported.

    Interleaved Memory

    This realm contains the reminiscence configuration for each cell.

    Specifications

    A cell's reminiscence can live configured as interleaved, cell local (which means no interleaving) or it may live a mix of the two.

    The dynamic configuration data structure is used by the Instant Capacity, Temporary Instant Capacity, and Pay per utilize solutions. survey the respective chapters for details on each of those VSE components.

    The partition configuration data contains data for each nPartition. Each nPartition in a intricate has a unique PCD data structure. Therefore, as many as sixteen divide PCD data structures could live present in a fully configured HP Superdome server containing sixteen nPartitions. Table 4-3 lists the most notable fields in each PCD data structure and their relevance to nPartition management.

    Table 4-3. Key Fields in PCD Data Structure

    Field in PCD

    Importance

    nPartition Name

    This realm contains a descriptive label for the nPartition. It is not necessarily the very as the hostname for the nPartition and is typically used to portray the workloads running in the nPartition.

    Core Cell Choices

    This realm contains the user-specified order in which the core cell should live chosen. Should the first cell specified in this list become unusable as a core cell, firmware will proceed to the next cell in the list. If the list of core cell choices is not specified by the user, firmware will utilize the default algorithm to select the core cell for the nPartition, generally based on the cell with the lowest cell ID that is capable of being a core cell.

    Use on Next Boot

    This realm indicates whether each of the cells should live integrated into the nPartition the next time a reboot or shutdown for reconfiguration is performed on the nPartition. This realm is typically used for Instant Capacity licensing purposes or for situations where a cell has experienced a hardware failure and should not live integrated into the nPartition until it can live repaired.

    Admin IP Address

    This realm contains an IP address which can live used for administrative purposes to communicate with the operating system running in an nPartition. This realm requires manual setting by administrators with the nPartition command line interfaces. If this value is set, management tools such as Partition Manager are able to communicate with each nPartition in the intricate to accumulate operating system–specific information such as the operating system character and version.

    Boot Paths

    This realm allows up to three boot paths to live specified. The primary, high-availability alternate, and alternate boot paths are each and every stored in this field. The PCD is only used for storing boot paths on HP 9000 nPartition servers. HP Integrity nPartition servers utilize a different storage location. As a result of this difference, when managing HP 9000 nPartition servers, boot paths are visible for each and every nPartitions in the complex. However, management tools on HP Integrity nPartition Servers are capable of reading the boot paths for only the nPartition where the management tools are running.


    Intec Singl.eView Convergent Billing Sets Performance Benchmark on HP Integrity Server | killexams.com actual questions and Pass4sure dumps

    ATLANTA--(BUSINESS WIRE)--Sept. 8, 2005--Intec Telecom Systems (LSE: ITL.L)

    -- Latest Singl.eView release rates and bills 250 million events in 6 hours; demonstrates low hardware requirements for billing 10 million wireless subscribers

    -- Singl.eView v6 already live on Itanium 2-based HP Integrity servers at major European operator

    Intec Telecom Systems has benchmarked Singl.eView(TM) v6, the latest version of its market-leading customer faith and billing system, on a unique instance of a mid-range HP Integrity server to demonstrate the performance of its highly-efficient architecture.

    In a six hour test using an Intel(R) Itanium(R) 2-based HP Integrity Superdome server with 32 CPUs running on the HP-UX 11i operating environment, the benchmark configuration simulated traffic from a wireless telecommunications service provider with 10 million subscribers. In the benchmark, Singl.eView generated 2.5 million customer invoices from 250 million events in a 6 hour bill run. Notably, the test included each and every billing processes, from receiving and rating events to generating invoice images.

    "Supporting the complete purview of billing processes for ten million wireless subscribers on a unique server is an outstanding result, and underscores the architectural efficiency of Singl.eView v6's design," said Intec COO of Product Operations and Services Gary Bunney.

    A multi-country implementation of Singl.eView v6 running on HP Itanium 2 Integrity servers has been in live production since May 2005. This implementation, at one of Europe's fastest-growing carriers, is expected to uphold over 23 million subscribers within the next 18 months.

    "Singl.eView on HP Integrity servers running HP-UX 11i is a very cost-effective solution for great network service providers," said Don Jenkins, vice president of marketing, trade critical Servers at HP. "These results demonstrate once again the faculty of HP Integrity servers to manage the most demanding workloads and Singl.eView's low hardware footprint and excellent cost of ownership attributes."

    Intec CEO Kevin Adams added, "We are pleased to live able to present HP Integrity servers as a tall performance and low cost alternative for their retail billing and customer faith system. These benchmark results provide further confidence to their tier 1 telecom customers of the performance and low TCO of Singl.eView."

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    About Intec

    Intec Telecom Systems is a leading supplier of trade and operations uphold systems (BSS/OSS) to over 500 customers across the global telecoms industry. Intec is world market leader in both inter-carrier billing and mediation, and one of the largest suppliers of retail billing systems. Intec's customer base now includes over 60 per cent of the world's top 100 carriers. Founded in 1997, Intec is listed on the London Stock Exchange (ITL.L) and has over 1,500 staff and 29 offices in 23 countries. For more information, visit the Intec website at www.intecbilling.com.

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    Red Hat Enterprise Linux Cluster Suite | killexams.com actual questions and Pass4sure dumps

    When mission-critical applications fail, so does your business. This often is a proper statement in today's environments, where most organizations disburse millions of dollars making their services available 24/7, 365 days a year. Organizations, regardless of whether they are serving external customers or internal customers, are deploying highly available solutions to outcome their applications highly available.

    In view of this growing demand, almost every IT vendor currently is providing high-availability solutions for its specific platform. eminent commercial high-availability solutions comprehend IBM's HACMP, Veritas' Cluster Server and HP's Serviceguard.

    If you're looking for a commercial high-availability solution on Red Hat Enterprise Linux, the best choice probably is the Red Hat Cluster Suite.

    In early 2002, Red Hat introduced the first member of its Red Hat Enterprise Linux family of products, Red Hat Enterprise Linux AS (originally called Red Hat Linux Advanced Server). Since then, the family of products has grown steadily, and it now includes Red Hat Enterprise Linux ES (for entry- and mid-range servers) and Red Hat Enterprise Linux WS (for desktops/workstations). These products are designed specifically for utilize in enterprise environments to deliver superior application support, performance, availability and scalability.

    The original release of Red Hat Enterprise Linux AS version 2.1 included a high-availability clustering feature as section of the base product. This feature was not included in the smaller Red Hat Enterprise Linux ES product. However, with the success of the Red Hat Enterprise Linux family, it became limpid that high-availability clustering was a feature that should live made available for both AS and ES server products. Consequently, with the release of Red Hat Enterprise Linux version 3 in October 2003, the high-availability clustering feature was packaged into an optional layered product called the Red Hat Cluster Suite, and it was certified for utilize on both the Enterprise Linux AS and Enterprise Linux ES products.

    The RHEL cluster suite is a separately licensed product and can live purchased from Red Hat on top of Red Hat's base ES Linux license.

    Red Hat Cluster Suite Overview

    The Red Hat Cluster Suite has two major features. One is the Cluster Manager that provides tall availability, and the other feature is called IP load balancing (originally called Piranha). The Cluster Manager and IP load balancing are complementary high-availability technologies that can live used separately or in combination, depending on application requirements. Both of these technologies are integrated in Red Hat's Cluster Suite. In this article, I focus on the Cluster Manager.

    Table 1 shows the major components of the RHEL Cluster Manager.

    Table 1. RHEL Cluster Manager Components

    Software Subsystem Component Purpose Fence fenced Provides fencing infrastructure for specific hardware platforms. DLM libdlm, dlm-kernel Contains distributed lock management (DLM) library. CMAN cman Contains the Cluster Manager (CMAN), which is used for managing cluster membership, messaging and notification. GFS and related locks Lock_NoLock Contains shared filesystem uphold that can live mounted on multiple nodes concurrently. GULM gulm Contains the GULM lock management user-space tools and libraries (an alternative to using CMAN and DLM). Rgmanager clurgmgrd, clustat Manages cluster services and resources. CCS ccsd, ccs_test and ccs_tool Contains the cluster configuration services dæmon (ccsd) and associated files. Cluster Configuration Tool System-config-cluster Contains the Cluster Configuration Tool, used to configure the cluster and pomp the current status of the nodes, resources, fencing agents and cluster services graphically. Magma magma and magma-plugins Contains an interface library for cluster lock management and required plugins. IDDEV iddev Contains the libraries used to identify the filesystem (or volume manager) in which a device is formatted.

    Shared Storage and Data Integrity

    Lock management is a common cluster infrastructure service that provides a mechanism for other cluster infrastructure components to synchronize their access to shared resources. In a Red Hat cluster, DLM (Distributed Lock Manager) or, alternatively, GULM (Grand Unified Lock Manager) are feasible lock manager choices. GULM is a server-based unified cluster/lock manager for GFS, GNBD and CLVM. It can live used in condition of CMAN and DLM. A unique GULM server can live rush in standalone mode but introduces a unique point of failure for GFS. Three or five GULM servers furthermore can live rush together, in which case the failure of one or two servers can live tolerated, respectively. GULM servers usually are rush on dedicated machines, although this is not a strict requirement.

    In my cluster implementation, I used DLM, and it runs in each cluster node. DLM is superb choice for miniature clusters (up to two nodes), because it removes quorum requirements as imposed by the GULM mechanism).

    Based on DLM or GLM locking functionality, there are two basic techniques that can live used by the RHEL cluster for ensuring data integrity in concurrent access environments. The traditional artery is the utilize of CLVM, which works well in most RHEL cluster implementations with LVM-based analytic volumes.

    Another technique is GFS. GFS is a cluster filesystem that allows a cluster of nodes to access simultaneously a block device that is shared among the nodes. It employs distributed metadata and multiple journals for optimal operation in a cluster. To maintain filesystem integrity, GFS uses a lock manager (DLM or GULM) to coordinate I/O. When one node changes data on a GFS filesystem, that change is visible immediately to the other cluster nodes using that filesystem.

    Hence, when you are implementing a RHEL cluster with concurrent data access requirements (such as, in the case of an Oracle RAC implementation), you can utilize either GFS or CLVM. In most Red Hat cluster implementations, GFS is used with a direct access configuration to shared SAN from each and every cluster nodes. However, for the very purpose, you furthermore can deploy GFS in a cluster that is connected to a LAN with servers that utilize GNBD (Global Network block Device) or two iSCSI (Internet miniature Computer System Interface) devices.

    Both GFS and CLVM utilize locks from the lock manager. However, GFS uses locks from the lock manager to synchronize access to filesystem metadata (on shared storage), while CLVM uses locks from the lock manager to synchronize updates to LVM volumes and volume groups (also on shared storage).

    For nonconcurrent RHEL cluster implementations, you can faith on CLVM, or you can utilize native RHEL journaling-based techniques (such as ext2 and ext3). For nonconcurrent access clusters, data integrity issues are minimal; I tried to preserve my cluster implementations simple by using native RHEL OS techniques.

    Fencing Infrastructure

    Fencing furthermore is an primary component of every RHEL-based cluster implementation. The main purpose of the fencing implementation is to ensure data integrity in a clustered environment.

    In fact, to ensure data integrity, only one node can rush a cluster service and access cluster service data at a time. The utilize of power switches in the cluster hardware configuration enables a node to power-cycle another node before restarting that node's cluster services during the failover process. This prevents any two systems from simultaneously accessing the very data and corrupting it. It is strongly recommended that fence devices (hardware or software solutions that remotely power, shut down and reboot cluster nodes) are used to guarantee data integrity under each and every failure conditions. Software-based watchdog timers are an alternative used to ensure correct operation of cluster service failover; however, in most RHEL cluster implementations, hardware fence devices are used, such as HP ILO, APC power switches, IBM BladeCenter devices and the Bull NovaScale Platform Administration Processor (PAP) Interface.

    Note that for RHEL cluster solutions with shared storage, an implementation of the fence infrastructure is a mandatory requirement.

    Step-by-Step Implementation of a RHEL Cluster

    Implementation of RHEL clusters starts with the selection of proper hardware and connectivity. In most implementations (without IP load balancing), shared storage is used with two, or more than two, servers running the RHEL operating system and RHEL cluster suite.

    A properly designed cluster, whether you are pile a RHEL-based cluster or an IBM HACMP-based cluster, should not accommodate any unique point of failure. Keeping this in mind, you own to remove any unique point of failure from your cluster design. For this purpose, you can condition your servers physically in two divide racks with redundant power supplies. You furthermore own to remove any unique point of failure from the network infrastructure used for the cluster. Ideally, you should own at least two network adapters on each cluster node, and two network switches should live used for pile the network infrastructure for the cluster implementation.

    Software Installation

    Building a RHEL cluster starts with the installation of RHEL on two cluster nodes. My setup has two HP Proliant servers (DL740) with shared fiber storage (HP MSA1000 storage). I started with a RHEL v4 installation on both nodes. It's best to install the latest available operating system version and its updates. I selected v4 update 4 (which was the latest version of RHEL when I was pile that cluster). If you own a valid software subscription from Red Hat, you can log in to the Red Hat network, and Go to software channels to download the latest update available. Later, once you download the ISO images, you can burn it to CDs using any arrogate software. During the RHEL OS installation, you will Go through various configuration selections, the most primary of which are the date and time-zone configuration, the root user password setting, firewall settings and OS security smooth selection. Another primary configuration option is network settings. Configuration of these settings can live left for a later stage, especially in pile a high-availability solution with Ether-channel (or Ethernet bonding configuration).

    You may exigency to install additional drivers after you install the OS. In my case, I downloaded the RHEL uphold package for the DL740 servers (the HP Proliant uphold pack, which is available from h18004.www1.hp.com/products/servers/linux/dl740-drivers-cert.html).

    The next step is installing the cluster software package itself. This package, again, is available from the RHEL network, and you definitely own to select the latest available cluster package. I selected rhel-cluster-2.4.0.1 for my setup, which was the latest cluster suite available at the time.

    Once downloaded, the package will live in tar format. Extract it, and then install at least the following RPMs, so that the RHEL cluster with DLM can live installed and configured:

  • Magma and magma-plugins

  • Perl-net-telnet

  • Rgmanager

  • System-config-cluster

  • DLM and dlm-kernel

  • DLM-kernel-hugemem and SMP uphold for DLM

  • Iddev and ipvsadm

  • Cman, cman-smp, cman-hugemem and cman-kernelheaders

  • Ccs

  • Restart both RHEL cluster nodes after installing vendor-related hardware uphold drivers and the RHEL cluster suite.

    Network Configuration

    For network configuration, the best artery to proceed is to utilize the network configuration GUI. However, if you design to utilize Ethernet channel bonding, the configuration steps are slightly different.

    Ethernet channel bonding allows for a fault-tolerant network connection by combining two Ethernet devices into one virtual device. The resulting channel-bonded interface ensures that if one Ethernet device fails, the other device will become active. Ideally, connections from these Ethernet devices should Go to divide Ethernet switches or hubs, so that the unique point of failure is eliminated, even on the Ethernet switch and hub level.

    To configure two network devices for channel bonding, fulfill the following on node 1:

    1) Create bonding devices in /etc/modules.conf. For example, I used the following commands on each cluster node:

    alias bond0 bonding options bonding miimon=100 mode=1

    Doing this loads the bonding device with the bond0 interface appellation and passes options to the bonding driver to configure it as an active-backup master device for the enslaved network interfaces.

    2) Edit the /etc/sysconfig/network-scripts/ifcfg-eth0 configuration file for eth0 and the /etc/sysconfig/network-scripts/ifcfg-eth1 file for the eth1 interface, so that these files point to identical contents, as shown below:

    DEVICE=ethx USERCTL= no ONBOOT=yes MASTER=bond0 SLAVE=yes BOOTPROTO=none

    This enslaves ethX (replace X with the assigned number of the Ethernet devices) to the bond0 master device.

    3) Create a network script for the bonding device (for example, /etc/sysconfig/network-scripts/ifcfg-bond0), which would loom like the following example:

    DEVICE=bond0 USERCTL=no ONBOOT=yes BROADCAST=172.16.2.255 NETWORK=172.16.2.0 NETMASK=255.255.255.0 GATEWAY=172.16.2.1 IPADDR=172.16.2.182

    4) Reboot the system for the changes to hold effect.

    5) Similarly, on node 2, reiterate the very steps with the only divergence being that the file /etc/sysconfig/network-scripts/ifcfg-bond0 should accommodate an IPADDR entry with the value of 172.16.2.183.

    As a result of these configuration steps, you will near up with two RHEL cluster nodes with IP addresses of 172.16.2.182 and 172.16.2.183, which own been assigned to virtual Ethernet channels (the underlying two physical Ethernet adapters for each Ethernet channel).

    Now, you easily can utilize the network configuration GUI on the cluster nodes to set other network configuration details, such as hostname and primary/secondary DNS server configuration. I set Commsvr1 and Commsvr2 as the hostnames for the cluster nodes and furthermore ensured that appellation resolution in both long names and short names would work fine from both the DNS server and the /etc/hosts file.

    A RHEL cluster, by default, uses /etc/hosts for node appellation resolution. The cluster node appellation needs to match the output of uname -n or the value of HOSTNAME in /etc/sysconfig/network.

    Listing 1. Contents of the /etc/hosts File on Each Server

    # achieve not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 localhost.localdomain localhost 172.16.2.182 Commsvr1 Commsvr1.kmefic.com.kw 172.16.2.183 Commsvr2 172.16.1.186 Commilo1 Commilo1.kmefic.com.kw 172.16.1.187 Commilo2 Commilo2.kmefic.com.kw 172.16.2.188 Commserver 192.168.10.1 node1 192.168.10.2 node2 172.16.2.4 KMETSM

    If you own an additional Ethernet interface in each cluster node, it is always a superb faith to configure a divide IP network as an additional network for heartbeats between cluster nodes. It is primary that the RHEL cluster uses, by default, eth0 on the cluster nodes for heartbeats. However, it is noiseless feasible to utilize other interfaces for additional heartbeat exchanges.

    For this character of configuration, you simply can utilize the network configuration GUI to allot IP addresses—for example, 192.168.10.1 and 192.168.10.2 on eth2, and regain it resolved from the /etc/hosts file.

    Setup of the Fencing Device

    As I was using HP hardware, I relied on the configuration of the HP ILO devices as a fencing device for my cluster. However, you may consider configuring other fencing devices, depending on the hardware character used for your cluster configuration.

    To configure HP ILO, you own to reboot your servers and press the F8 key to enter into the ILO configuration menus. Basic configuration is relatively simple; you own to allot IP addresses to ILO devices with the appellation of the ILO device. I assigned 172.16.1.100 with Commilo1 as the appellation of ILO device on node1, and 172.16.1.101 with Commilo2 as the ILO device appellation on node2. live sure, however, to connect Ethernet cables to the ILO adapters, which usually are marked clearly on the back side of HP servers.

    Once rebooted, you can utilize the browsers on your Linux servers to access ILO devices. The default user appellation is Administrator, with a password that usually is available on the hard-copy tag associated with the HP servers. Later, you can change the Administrator password to a password of your choice, using the very Web-based ILO administration interface.

    Setup of the Shared Storage Drive and Quorum Partitions

    In my cluster setup environment, I used an HP fiber-based shared storage MSA1000. I configured a RAID-1 of 73.5GB using the HP smart array utility, and then assigned it to both of my cluster nodes using the selective host presentation feature.

    After rebooting both nodes, I used HP fiber utilities, such as hp_scan, so that both servers should live able to survey this array physically.

    To verify the physical availability of shared storage for both cluster nodes, glimpse in the /dev/proc/proc file for an entry like /dev/sda or /dev/sdb, depending upon your environment.

    Once you find your shared storage on the OS level, partition it according to your cluster storage requirements. I used the parted appliance on one of my cluster nodes to partition the shared storage. I created two miniature primary partitions to hold raw devices, and a third primary partition was created to hold the shared data filesystem:

    Parted> select /dev/sda Parted > mklabel /dev/sda msdos Parted > mkpart primary ext3 0 20 Parted > mkpart primary ext3 20 40 Parted > mkpart primary ext3 40 40000

    I rebooted both cluster nodes and created the /etc/sysconfig/rawdevices file with the following contents:

    /dev/raw/raw1 /dev/sda1 /dev/raw/raw2 /dev/sda2

    A restart of rawdevices services on both nodes will configure raw devices as quorum partitions:

    /home/root> services rawdevices restart

    I then created a JFS2 filesystem on the third primary partition using the mke2jfs command; however, its related entry should not live redeem in the /etc/fstab file on either cluster node, as this shared filesystem will live under the control of the Rgmanager of the cluster suite:

    /home/root> mke2jfs -j -b 4096 /dev/sda3

    Now, you can create a directory structure called /shared/data on both nodes and verify the accessibility of the shared filesystem from both cluster nodes by mounting that filesystem one by one at each cluster node (mount /dev/sda3 /shared/data). However, never try to mount this filesystem on both cluster nodes simultaneously, as it might debase the filesystem itself.

    Cluster Configuration

    Almost everything required for cluster infrastructure has been done, so the next step is configuring the cluster itself.

    A RHEL cluster can live configured in many ways. However, the easiest artery to configure a RHEL cluster is to utilize the RHEL GUI and Go to System Management→Cluster Management→Create a cluster.

    I created a cluster with the cluster appellation of Commcluster, and with node names of Commsvr1 and Commsvr2. I added fencing to both nodes—fencing devices Commilo1 and Commilo2, respectively—so that each node would own one fence smooth with one fence device. If you own multiple fence devices in your environment, you can add another fence smooth with more fence devices to each node.

    I furthermore added a shared IP address of 172.16.2.188, which will live used as the service IP address for this cluster. This is the IP address that furthermore should live used as the service IP address for applications or databases (like for listener configuration, if you are going to utilize an Oracle database in the cluster).

    I added a failover domain, namely Kmeficfailover, with priorities given in the following sequence:

    Commsvr1 Commsvr2

    I added a service called CommSvc and then redeem that service in the above-defined failover domain. The next step is adding resources to this service. I added a private resource of the filesystem type, which has the characteristic of device=/dev/sd3, mountpoint of /shared/data and mount character of ext3.

    I furthermore added a private resource of the script character (/root/CommS.sh) to service CommSvc. This script will start my C-based application, and therefore, it has to live present in the /root directory on both cluster nodes. It is very primary to own correct ownership of root and security; otherwise, you can expect unpredictable conduct during cluster startup and shutdown.

    Application or database startup and shutdown scripts are very primary for a RHEL-based cluster to duty properly. RHEL clusters utilize the very scripts for providing application/database monitoring and tall availability, so every application script used in a RHEL cluster should own a specific format.

    All such scripts should at least own start and desist subsections, along with a status subsection. When an application or database is available and running, the status subsection of the script should recur a value of 0, and when an application is not running or available, it should recur a value of 1. The script furthermore should accommodate a restart subsection, which tries to restart services if the application is establish to live dead.

    A RHEL cluster always tries to restart the application on the very node that was the previous owner of the application, before trying to wobble that application to the other cluster node. A sample application script, which was used in my RHEL cluster implementation (to provide tall availability to a legacy C-based application) is shown in Listing 2.

    Listing 2. Sample Application Script

    #Script Name: CommS.sh #Script Purpose: To provide application #start/stop/status under Cluster #Script Author: Khurram Shiraz #!/bin/sh basedir=/home/kmefic/KMEFIC/CommunicationServer case $1 in 'start') cd $basedir su kmefic -c "./CommunicationServer -f Dev-CommunicationServer.conf" exit 0 ;; 'stop') z=`ps -ef | grep Dev-CommunicationServer | grep -v "grep"| ↪awk ' { print $2 } ' ` if [[ $? -eq 0 ]] then kill -9 $z fuser -mk /home/kmefic exit 0 fi ;; 'restart') /root/CommunicationS.sh stop sleep 2 echo Now starting...... /root/CommunicationS.sh start echo "restarted" ;; 'status') ps -U kmefic | grep CommunicationSe 1>/dev/null if [[ $? = 0 ]] then exit 0 else exit 1 fi ;; esac

    Finally, you own to add a shared IP address (172.16.2.188) to the service present in your failover domain, so that the service should accommodate three resources: two private resources (one filesystem and one script) and one shared resource, which is the service IP address for the cluster.

    The ultimate step is synchronizing the cluster configuration across the cluster nodes. The RHEL cluster administration and configuration appliance provides a “save configuration to cluster” option, which will loom once you start the cluster services. Hence, for the first synchronization, it is better to transmit the cluster configuration file manually to each and every cluster nodes. You easily can utilize the scp command to synchronize the /etc/cluster/cluster.conf file across the cluster nodes:

    /home/root> scp /etc/cluster/cluster.conf Commsvr2:/etc/cluster/cluster.conf

    Once synchronized, you can start cluster services on both cluster nodes. You should start and desist RHEL-related cluster services, in sequence.

    To start:

    service ccsd start service cman start service fenced start service rgmanager start

    To stop:

    service rgmanager stop service fenced stop service cman stop service ccsd stop

    If you utilize GFS, startup/shutdown of the gfs and clvmd services own to live included in this sequence.

    Additional Considerations

    In my environment, I decided not to start cluster services at RHEL boot time and not to shut down these services automatically when shutting down the RHEL box. However, if your trade requires 24/7 service availability, you can achieve this easily by using the chkconfig command.

    Another consideration is logging cluster messages in a different log file. By default, each and every cluster messages Go into the RHEL log messages file (/var/log/messages), which makes cluster troubleshooting moderately difficult in some scenarios. For this purpose, I edited the /etc/syslog.conf file to enable the cluster to log events to a file that is different from the default log file and added the following line:

    daemon.* /var/log/cluster

    To apply this change, I restarted syslogd with the service syslog restart command. Another primary step is to specify the time term for rotating cluster log files. This can live done by specifying the appellation of the cluster log file in the /etc/logrotate.conf file (the default is a weekly rotation):

    /var/log/messages /var/log/secure /var/log/maillog /var/log/spooler /var/log/boot.log /var/log/cron /var/log/cluster { sharedscripts postrotate /bin/kill -HUP `cat /var/run/syslogd.pid 2> /dev/null` 2> /dev/null || true endscript }

    You furthermore own to pay special attention to keeping UIDs and GIDs synchronized across cluster nodes. This is primary in making positive proper permissions are maintained, especially with reference to the shared data filesystem.

    GRUB furthermore needs to conform to the suite environment's specific needs. For instance, many system administrators, in a RHEL cluster environment, reduce the GRUB selection timeout to some lower values, such as two seconds, to accelerate system restart time.

    Database Integration with a RHEL Cluster

    The very RHEL cluster infrastructure can live used for providing tall availability to databases, such as Oracle, MySQL and IBM DB2.

    The most primary thing to recall is to base your database-related services on a shared IP address—for example, you own to configure Oracle listener based on the shared service IP address.

    Next, I explain, in simple steps, how to utilize an already-configured RHEL cluster to provide tall availability to a MySQL database server, which is, no doubt, one of the most commonly used databases on RHEL.

    I assume that the MySQL-related RPMs are installed on both cluster nodes and that the RHEL cluster already is configured with a service IP address of 172.16.2.188.

    Now, you simply exigency to define a failover domain using the cluster configuration appliance (with the cluster node of your choice having a higher priority). This failover domain will own the MySQL service, which, in turn, will own two private resources and one shared resource (the service IP address).

    One of the private resources should live of the filesystem character (in my configuration, it has a mountpoint of /shared/mysqld), and the other private resource should live of the script type, pointing toward the /etc/init.d/mysql.server script. The contents of this script, which should live available on both cluster nodes, is shown in Listing 3 on the LJ FTP site at ftp.linuxjournal.com/pub/lj/listings/issue163/9759.tgz.

    This script sets the data directory to /shared/mysqld/data, which is available on their shared RAID array and should live available from both cluster nodes.

    Testing for tall availability of the MySQL database can live done easily with the wait on of any MySQL client. I used SQLyog, which is a Windows-based MySQL client. I connected to the MySQL database on Commsvr1 and then crashed this cluster node using the halt command. As a result of this system crash, the RHEL cluster events were triggered, and the MySQL database automatically restarted on Commsvr2. This total failover process took one to two minutes and happened quite seamlessly.

    Summary

    RHEL clustering technology provides a trustworthy high-available infrastructure that can live used for meeting 24/7 trade requirements for databases as well as legacy applications. The most primary thing to recall is that it is best to design carefully before the actual implementation and test your cluster and each and every feasible failover scenarios thoroughly before going live with a RHEL cluster. A well-documented cluster test design furthermore can live helpful in this regard.



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    References :


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