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Test Number : HP0-255
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: 140 Dumps Questions

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Planning and Design of HP Integrity Mid-Range Server Solutions book

pink Hat commercial enterprise Linux Cluster Suite | HP0-255 Dumps and Real test Questions with VCE Practice Test

When mission-important purposes fail, so does your business. This regularly is a real statement in state-of-the-art environments, where most groups spend tens of millions of greenbacks making their functions purchasable 24/7, twelve months a 12 months. organizations, inspite of even if they are serving exterior valued clientele or internal clients, are deploying totally obtainable options to make their applications incredibly purchasable.

In view of this turning out to be demand, pretty much every IT supplier presently is proposing excessive-availability solutions for its specific platform. noted business high-availability solutions consist of IBM's HACMP, Veritas' Cluster Server and HP's Serviceguard.

when you are hunting for a industrial excessive-availability answer on purple Hat business Linux, the best option likely is the purple Hat Cluster Suite.

In early 2002, pink Hat delivered the primary member of its red Hat commercial enterprise Linux household of items, pink Hat commercial enterprise Linux AS (at the beginning referred to as red Hat Linux superior Server). due to the fact that then, the household of items has grown continuously, and it now comprises purple Hat commercial enterprise Linux ES (for entry- and mid-range servers) and crimson Hat enterprise Linux WS (for computers/workstations). These products are designed particularly to be used in commercial enterprise environments to deliver advanced utility guide, efficiency, availability and scalability.

The common liberate of pink Hat commercial enterprise Linux AS edition 2.1 covered a high-availability clustering characteristic as a part of the base product. This function became now not protected within the smaller pink Hat commercial enterprise Linux ES product. however, with the success of the purple Hat enterprise Linux household, it grew to become clear that excessive-availability clustering become a characteristic that may still be made obtainable for each AS and ES server items. as a result, with the release of pink Hat business Linux edition 3 in October 2003, the high-availability clustering function was packaged into an optional layered product referred to as the crimson Hat Cluster Suite, and it turned into certified to be used on each the business Linux AS and commercial enterprise Linux ES products.

The RHEL cluster suite is a one at a time licensed product and may be bought from pink Hat on suitable of crimson Hat's base ES Linux license.

pink Hat Cluster Suite Overview

The crimson Hat Cluster Suite has two essential aspects. One is the Cluster supervisor that gives excessive availability, and the other feature is referred to as IP load balancing (initially known as Piranha). The Cluster manager and IP load balancing are complementary excessive-availability technologies that can also be used one after the other or in mixture, reckoning on application requirements. both of these technologies are integrated in pink Hat's Cluster Suite. listed here, I center of attention on the Cluster manager.

table 1 shows the foremost components of the RHEL Cluster supervisor.

desk 1. RHEL Cluster supervisor add-ons

utility Subsystem component goal Fence fenced gives fencing infrastructure for particular hardware platforms. DLM libdlm, dlm-kernel incorporates allotted lock management (DLM) library. CMAN cman consists of the Cluster manager (CMAN), which is used for managing cluster membership, messaging and notification. GFS and related locks Lock_NoLock consists of shared filesystem guide that will also be hooked up on dissimilar nodes at the same time as. GULM gulm contains the GULM lock administration person-house tools and libraries (an alternative choice to the usage of CMAN and DLM). Rgmanager clurgmgrd, clustat Manages cluster features and materials. CCS ccsd, ccs_test and ccs_tool includes the cluster configuration functions dæmon (ccsd) and linked files. Cluster Configuration tool equipment-config-cluster contains the Cluster Configuration device, used to configure the cluster and display the existing fame of the nodes, materials, fencing brokers and cluster features graphically. Magma magma and magma-plugins contains an interface library for cluster lock management and required plugins. IDDEV iddev consists of the libraries used to determine the filesystem (or quantity manager) through which a device is formatted.

Shared Storage and statistics Integrity

Lock administration is a typical cluster infrastructure service that offers a mechanism for other cluster infrastructure add-ons to synchronize their access to shared substances. In a pink Hat cluster, DLM (allotted Lock manager) or, alternatively, GULM (Grand Unified Lock manager) are possible lock supervisor selections. GULM is a server-based mostly unified cluster/lock manager for GFS, GNBD and CLVM. It may also be used in region of CMAN and DLM. A single GULM server may also be run in standalone mode but introduces a single point of failure for GFS. Three or five GULM servers also can be run together, wherein case the failure of 1 or two servers can also be tolerated, respectively. GULM servers usually are run on committed machines, besides the fact that children this is now not a strict requirement.

In my cluster implementation, I used DLM, and it runs in each cluster node. DLM is first rate choice for small clusters (up to 2 nodes), since it eliminates quorum necessities as imposed by using the GULM mechanism).

according to DLM or GLM locking performance, there are two fundamental techniques that may also be used by the RHEL cluster for making certain records integrity in concurrent access environments. The typical way is the use of CLVM, which works neatly in most RHEL cluster implementations with LVM-based mostly logical volumes.

another method is GFS. GFS is a cluster filesystem that makes it possible for a cluster of nodes to entry simultaneously a block machine it's shared among the nodes. It employs allotted metadata and distinct journals for top-rated operation in a cluster. To maintain filesystem integrity, GFS makes use of a lock manager (DLM or GULM) to coordinate I/O. When one node adjustments information on a GFS filesystem, that trade is visible automatically to the different cluster nodes using that filesystem.

hence, when you are imposing a RHEL cluster with concurrent statistics access necessities (reminiscent of, in the case of an Oracle RAC implementation), that you could use either GFS or CLVM. In most red Hat cluster implementations, GFS is used with an instantaneous access configuration to shared SAN from all cluster nodes. youngsters, for the same goal, you also can deploy GFS in a cluster that's connected to a LAN with servers that use GNBD (world network Block equipment) or two iSCSI (internet Small desktop gadget Interface) contraptions.

both GFS and CLVM use locks from the lock manager. youngsters, GFS makes use of locks from the lock supervisor to synchronize entry to filesystem metadata (on shared storage), whereas CLVM makes use of locks from the lock supervisor to synchronize updates to LVM volumes and quantity organizations (additionally on shared storage).

For nonconcurrent RHEL cluster implementations, which you can rely on CLVM, otherwise you can use native RHEL journaling-primarily based thoughts (equivalent to ext2 and ext3). For nonconcurrent entry clusters, information integrity considerations are minimal; i attempted to preserve my cluster implementations primary through the use of native RHEL OS options.

Fencing Infrastructure

Fencing also is a crucial element of every RHEL-primarily based cluster implementation. The main aim of the fencing implementation is to make certain facts integrity in a clustered ambiance.

really, to be sure records integrity, just one node can run a cluster provider and entry cluster service facts at a time. the use of vigor switches within the cluster hardware configuration makes it possible for a node to vigour-cycle an extra node before restarting that node's cluster features during the failover system. This prevents any two methods from concurrently getting access to the same facts and corrupting it. it's strongly counseled that fence contraptions (hardware or utility solutions that remotely vigour, shut down and reboot cluster nodes) are used to ensure information integrity beneath all failure circumstances. software-primarily based watchdog timers are an alternative used to be sure suitable operation of cluster provider failover; however, in most RHEL cluster implementations, hardware fence instruments are used, corresponding to HP ILO, APC vigour switches, IBM BladeCenter contraptions and the Bull NovaScale Platform Administration Processor (PAP) Interface.

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

Step-by means of-Step Implementation of a RHEL Cluster

Implementation of RHEL clusters begins with the preference of relevant hardware and connectivity. In most implementations (with out IP load balancing), shared storage is used with two, or more than two, servers working the RHEL operating gadget and RHEL cluster suite.

A effectively designed cluster, even if you are building a RHEL-based cluster or an IBM HACMP-primarily based cluster, should still now not comprise any single factor of failure. maintaining this in mind, you have to eradicate any single element of failure out of your cluster design. For this intention, which you can region your servers bodily in two separate racks with redundant power substances. You also have to remove any single aspect of failure from the network infrastructure used for the cluster. Ideally, be sure you have at the least two community adapters on every cluster node, and two community switches should be used for building the community infrastructure for the cluster implementation.

software setting up

constructing a RHEL cluster begins with the installing 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 installing on both nodes. it be highest quality to installation the latest obtainable working gadget version and its updates. I chosen v4 update four (which turned into the latest edition of RHEL when i used to be building that cluster). when you've got a legitimate application subscription from crimson Hat, you could log in to the crimson Hat community, and go to application channels to down load the latest replace attainable. Later, once you down load the ISO photographs, that you could burn it to CDs the usage of any appropriate utility. all the way through the RHEL OS installation, you're going to move through a lot of configuration choices, essentially the most essential of which might be the date and time-zone configuration, the basis consumer password setting, firewall settings and OS security level preference. an additional vital configuration alternative is network settings. Configuration of these settings can be left for a later stage, specifically in constructing a high-availability solution with Ether-channel (or Ethernet bonding configuration).

You may wish to deploy further drivers after you installation the OS. In my case, I downloaded the RHEL aid kit for the DL740 servers (the HP Proliant support pack, which is purchasable from h18004.www1.hp.com/products/servers/linux/dl740-drivers-cert.html).

The subsequent step is installation the cluster application equipment itself. This kit, once more, is accessible from the RHEL network, and also you really have to choose the latest available cluster equipment. I selected rhel-cluster-2.4.0.1 for my setup, which became the latest cluster suite available on the time.

once downloaded, the kit might be in tar layout. Extract it, after which install at least right here RPMs, so that the RHEL cluster with DLM can be put in and configured:

  • Magma and magma-plugins

  • Perl-internet-telnet

  • Rgmanager

  • system-config-cluster

  • DLM and dlm-kernel

  • DLM-kernel-hugemem and SMP aid for DLM

  • Iddev and ipvsadm

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

  • Ccs

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

    network Configuration

    For network configuration, the top-quality technique to proceed is to use the community configuration GUI. youngsters, if you plan to make use of Ethernet channel bonding, the configuration steps are somewhat distinct.

    Ethernet channel bonding allows for for a fault-tolerant community connection by using combining two Ethernet instruments into one digital equipment. The resulting channel-bonded interface ensures that if one Ethernet device fails, the different device will develop into energetic. Ideally, connections from these Ethernet instruments should still go to separate Ethernet switches or hubs, in order that the only factor of failure is eradicated, even on the Ethernet change and hub level.

    To configure two community contraptions for channel bonding, function here on node 1:

    1) Create bonding gadgets in /and so on/modules.conf. for instance, I used here commands on each cluster node:

    alias bond0 bonding alternatives bonding miimon=a hundred mode=1

    Doing this loads the bonding gadget with the bond0 interface identify and passes options to the bonding driver to configure it as an energetic-backup grasp equipment for the enslaved community interfaces.

    2) Edit the /and so on/sysconfig/community-scripts/ifcfg-eth0 configuration file for eth0 and the /and so forth/sysconfig/network-scripts/ifcfg-eth1 file for the eth1 interface, in order that these information demonstrate similar contents, as proven below:

    gadget=ethx USERCTL= no ONBOOT=yesgrasp=bond0 SLAVE=definiteBOOTPROTO=none

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

    3) Create a network script for the bonding equipment (for instance, /and so on/sysconfig/community-scripts/ifcfg-bond0), which might appear as if the following example:

    gadget=bond0 USERCTL=no ONBOOT=convincedBROADCAST=172.sixteen.2.255 network=172.16.2.0 NETMASK=255.255.255.0 GATEWAY=172.16.2.1 IPADDR=172.16.2.182

    four) Reboot the device for the alterations to take effect.

    5) in a similar way, on node 2, repeat the identical steps with the handiest difference being that the file /etc/sysconfig/community-scripts/ifcfg-bond0 should comprise an IPADDR entry with the price of 172.sixteen.2.183.

    on account of these configuration steps, you're going to grow to be with two RHEL cluster nodes with IP addresses of 172.16.2.182 and 172.sixteen.2.183, which had been assigned to digital Ethernet channels (the underlying two genuine Ethernet adapters for every Ethernet channel).

    Now, you quite simply can use the community configuration GUI on the cluster nodes to set different community configuration details, comparable to hostname and first/secondary DNS server configuration. I set Commsvr1 and Commsvr2 because the hostnames for the cluster nodes and additionally ensured that name resolution in each lengthy names and short names would work first-class from each the DNS server and the /and so forth/hosts file.

    A RHEL cluster, by default, uses /etc/hosts for node name decision. The cluster node identify should fit the output of uname -n or the value of HOSTNAME in /and so forth/sysconfig/network.

    listing 1. Contents of the /and so on/hosts File on each and every Server

    # do not eradicate the following line, or a number of classes # that require network performance will fail. 127.0.0.1 localhost.localdomain localhost 172.sixteen.2.182 Commsvr1 Commsvr1.kmefic.com.kw 172.sixteen.2.183 Commsvr2 172.sixteen.1.186 Commilo1 Commilo1.kmefic.com.kw 172.sixteen.1.187 Commilo2 Commilo2.kmefic.com.kw 172.sixteen.2.188 Commserver 192.168.10.1 node1 192.168.10.2 node2 172.16.2.four KMETSM

    if in case you have an additional Ethernet interface in each and every cluster node, it's at all times a good suggestion to configure a separate IP community as an additional network for heartbeats between cluster nodes. it's vital that the RHEL cluster uses, by means of default, eth0 on the cluster nodes for heartbeats. besides the fact that children, it is still viable to make use of other interfaces for extra heartbeat exchanges.

    For this classification of configuration, you with no trouble can use the community configuration GUI to assign IP addresses—as an instance, 192.168.10.1 and 192.168.10.2 on eth2, and get it resolved from the /and so forth/hosts file.

    Setup of the Fencing equipment

    As i was using HP hardware, I relied on the configuration of the HP ILO gadgets as a fencing machine for my cluster. although, you might also agree with configuring other fencing devices, depending on the hardware classification used to your cluster configuration.

    To configure HP ILO, you have to reboot your servers and press the F8 key to enter into the ILO configuration menus. primary configuration is relatively essential; you need to assign IP addresses to ILO gadgets with the name of the ILO device. I assigned 172.16.1.one hundred with Commilo1 because the name of ILO device on node1, and 172.16.1.101 with Commilo2 because the ILO equipment identify on node2. make sure, besides the fact that children, to connect Ethernet cables to the ILO adapters, which constantly are marked clearly on the again side of HP servers.

    as soon as rebooted, which you could use the browsers in your Linux servers to access ILO gadgets. The default consumer name is Administrator, with a password that usually is purchasable on the challenging-replica tag linked to the HP servers. Later, that you would be able to exchange the Administrator password to a password of your choice, using the identical web-primarily based ILO administration interface.

    Setup of the Shared Storage force and Quorum Partitions

    In my cluster setup environment, I used an HP fiber-primarily based shared storage MSA1000. I configured a RAID-1 of seventy three.5GB the usage of the HP wise array utility, and then assigned it to both of my cluster nodes using the selective host presentation characteristic.

    After rebooting each nodes, I used HP fiber utilities, comparable to hp_scan, so that both servers should be in a position to see this array physically.

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

    once you locate your shared storage on the OS level, partition it according to your cluster storage necessities. I used the parted device on considered one of my cluster nodes to partition the shared storage. I created two small basic partitions to dangle raw instruments, and a 3rd primary partition changed into created to dangle the shared statistics filesystem:

    Parted> choose /dev/sda Parted > mklabel /dev/sda msdos Parted > mkpart primary ext3 0 20 Parted > mkpart basic ext3 20 forty Parted > mkpart fundamental ext3 forty 40000

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

    /dev/uncooked/raw1 /dev/sda1 /dev/uncooked/raw2 /dev/sda2

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

    /home/root> features rawdevices restart

    I then created a JFS2 filesystem on the third primary partition the usage of the mke2jfs command; youngsters, its linked entry should still not be put within the /and so forth/fstab file on both cluster node, as this shared filesystem may be beneath the handle of the Rgmanager of the cluster suite:

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

    Now, that you may create a listing constitution called /shared/records on each nodes and verify the accessibility of the shared filesystem from both cluster nodes via mounting that filesystem one by one at each and every cluster node (mount /dev/sda3 /shared/facts). however, under no circumstances try to mount this filesystem on each cluster nodes concurrently, because it might corrupt the filesystem itself.

    Cluster Configuration

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

    A RHEL cluster can be configured in lots of approaches. youngsters, the easiest method to configure a RHEL cluster is to make use of the RHEL GUI and go to gadget administration→Cluster administration→Create a cluster.

    I created a cluster with the cluster identify of Commcluster, and with node names of Commsvr1 and Commsvr2. I introduced fencing to both nodes—fencing gadgets Commilo1 and Commilo2, respectively—in order that every node would have one fence degree with one fence device. if you have dissimilar fence devices to your environment, that you can add one other fence degree with greater fence gadgets to each and every node.

    I also delivered a shared IP tackle of 172.16.2.188, which will be used because the service IP tackle for this cluster. here is the IP handle that additionally may still be used as the carrier IP tackle for purposes or databases (like for listener configuration, if you're going to use an Oracle database within the cluster).

    I added a failover domain, specifically Kmeficfailover, with priorities given in right here sequence:

    Commsvr1 Commsvr2

    I added a carrier known as CommSvc after which put that carrier within the above-described failover area. The subsequent step is including elements to this service. I added a personal resource of the filesystem type, which has the characteristic of gadget=/dev/sd3, mountpoint of /shared/facts and mount class of ext3.

    I additionally brought a non-public aid of the script classification (/root/CommS.sh) to provider CommSvc. This script will birth my C-based mostly application, and hence, it has to be present within the /root listing on each cluster nodes. It is terribly crucial to have suitable ownership of root and security; otherwise, you could predict unpredictable habits during cluster startup and shutdown.

    software or database startup and shutdown scripts are very important for a RHEL-based mostly cluster to function appropriately. RHEL clusters use the same scripts for featuring utility/database monitoring and excessive availability, so each software script used in a RHEL cluster may still have a specific format.

    All such scripts may still as a minimum have start and forestall subsections, together with a status subsection. When an application or database is accessible and working, the reputation subsection of the script may still return a price of 0, and when an software is not running or obtainable, it should return a worth of 1. The script also should still include a restart subsection, which tries to restart services if the software is discovered to be useless.

    A RHEL cluster always tries to restart the utility on the identical node that turned into the outdated owner of the utility, earlier than trying to circulation that application to the different cluster node. A pattern software script, which changed into used in my RHEL cluster implementation (to supply high availability to a legacy C-primarily based software) is proven in checklist 2.

    record 2. sample utility Script

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

    at last, you must add a shared IP address (172.sixteen.2.188) to the service present for your failover domain, so that the carrier may still contain three elements: two deepest substances (one filesystem and one script) and one shared aid, which is the carrier IP handle for the cluster.

    The closing step is synchronizing the cluster configuration throughout the cluster nodes. The RHEL cluster administration and configuration tool offers a “store configuration to cluster” choice, with a view to seem when you birth the cluster capabilities. hence, for the first synchronization, it is stronger to send the cluster configuration file manually to all cluster nodes. You effectively can use the scp command to synchronize the /etc/cluster/cluster.conf file across the cluster nodes:

    /home/root> scp /etc/cluster/cluster.conf Commsvr2:/and so forth/cluster/cluster.conf

    once synchronized, that you may beginning cluster features on both cluster nodes. be sure you delivery and forestall RHEL-connected cluster capabilities, in sequence.

    To delivery:

    carrier ccsd beginservice cman beginservice fenced beginservice rgmanager start

    To stop:

    carrier rgmanager ceasecarrier fenced stopprovider cman ceasecarrier ccsd stop

    in case you use GFS, startup/shutdown of the gfs and clvmd functions ought to be protected in this sequence.

    additional concerns

    In my ambiance, I determined now not to delivery cluster functions at RHEL boot time and not to shut down these features immediately when shutting down the RHEL box. although, in case your business requires 24/7 service availability, that you may do that with ease by using the chkconfig command.

    an additional consideration is logging cluster messages in a special log file. via default, all cluster messages go into the RHEL log messages file (/var/log/messages), which makes cluster troubleshooting slightly intricate in some eventualities. For this aim, I edited the /etc/syslog.conf file to allow the cluster to log hobbies to a file it really is distinctive from the default log file and introduced here line:

    daemon.* /var/log/cluster

    To apply this exchange, I restarted syslogd with the service syslog restart command. one other important step is to specify the time length for rotating cluster log info. This can be performed with the aid of specifying the name of the cluster log file within the /and so forth/logrotate.conf file (the default is a weekly rotation):

    /var/log/messages /var/log/relaxed /var/log/maillog /var/log/spooler /var/log/boot.log /var/log/cron /var/log/cluster actual endscript

    You also have to pay special attention to keeping UIDs and GIDs synchronized across cluster nodes. here is essential in making sure suitable permissions are maintained, specially near to the shared records filesystem.

    GRUB additionally should conform to the suite ambiance's certain wants. as an instance, many gadget directors, in a RHEL cluster ambiance, in the reduction of the GRUB selection timeout to a few lower values, such as two seconds, to accelerate gadget restart time.

    Database Integration with a RHEL Cluster

    The same RHEL cluster infrastructure can also be used for proposing excessive availability to databases, such as Oracle, MySQL and IBM DB2.

    essentially the most crucial element to remember is to base your database-related features on a shared IP tackle—for example, you should configure Oracle listener in line with the shared carrier IP address.

    next, I explain, in basic steps, how to use an already-configured RHEL cluster to supply excessive availability to a MySQL database server, which is, little question, probably the most widespread databases on RHEL.

    I assume that the MySQL-linked RPMs are installed on both cluster nodes and that the RHEL cluster already is configured with a provider IP address of 172.sixteen.2.188.

    Now, you without difficulty need to define a failover area the usage of the cluster configuration tool (with the cluster node of your option having a better precedence). This failover area can have the MySQL provider, which, in turn, can have two inner most materials and one shared resource (the service IP tackle).

    some of the inner most components should be of the filesystem class (in my configuration, it has a mountpoint of /shared/mysqld), and the different private useful resource may still be of the script class, pointing towards the /and so on/init.d/mysql.server script. The contents of this script, which may still be available on each cluster nodes, is shown in record 3 on the LJ FTP web site at ftp.linuxjournal.com/pub/lj/listings/issue163/9759.tgz.

    This script sets the statistics directory to /shared/mysqld/records, which is purchasable on their shared RAID array and should be attainable from each cluster nodes.

    checking out for prime availability of the MySQL database will also be carried out effectively with the help of any MySQL customer. I used SQLyog, which is a home windows-primarily based MySQL client. I linked to the MySQL database on Commsvr1 and then crashed this cluster node the usage of the halt command. on account of this gadget crash, the RHEL cluster movements have been triggered, and the MySQL database immediately restarted on Commsvr2. This complete failover system took one to 2 minutes and happened quite seamlessly.

    summary

    RHEL clustering technology offers a respectable high-obtainable infrastructure that may also be used for meeting 24/7 company necessities for databases as well as legacy purposes. essentially the most vital element to remember is that it's choicest to plan cautiously before the exact implementation and verify your cluster and all possible failover eventualities totally before going live with a RHEL cluster. A smartly-documented cluster check plan can also be constructive in this regard.


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