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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 drill 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 expend 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 gain their applications incredibly purchasable.

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

when you are hunting for a industrial excessive-availability respond on purple Hat trade 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 genesis 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 live 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 piece of the groundwork 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 limpid that excessive-availability clustering become a characteristic that may soundless live made obtainable for each AS and ES server items. as a result, with the release of pink Hat trade 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 live used on each the trade Linux AS and commercial enterprise Linux ES products.

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

pink Hat Cluster Suite Overview

The crimson Hat Cluster Suite has two essential aspects. One is the Cluster supervisor that gives exorbitant 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 too live 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 focus 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 usher that will too live hooked up on dissimilar nodes at the selfsame 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 panoply 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 feasible lock supervisor selections. GULM is a server-based mostly unified cluster/lock manager for GFS, GNBD and CLVM. It may too live used in region of CMAN and DLM. A single GULM server may too live flee in standalone mode but introduces a single point of failure for GFS. Three or five GULM servers too can live flee together, wherein case the failure of 1 or two servers can too live tolerated, respectively. GULM servers usually are flee 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 tiny 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 too live used by the RHEL cluster for making inevitable records integrity in concurrent access environments. The typical course is the exercise of CLVM, which works neatly in most RHEL cluster implementations with LVM-based mostly logical volumes.

another fashion is GFS. GFS is a cluster filesystem that makes it feasible for a cluster of nodes to entry simultaneously a secrete machine it's shared among the nodes. It employs allotted metadata and separate journals for top-rated operation in a cluster. To maintain filesystem integrity, GFS makes exercise 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 exercise either GFS or CLVM. In most red Hat cluster implementations, GFS is used with an instantaneous access configuration to shared SAN from every cluster nodes. youngsters, for the selfsame goal, you too can deploy GFS in a cluster that's connected to a LAN with servers that exercise GNBD (world network secrete equipment) or two iSCSI (internet tiny desktop gadget Interface) contraptions.

both GFS and CLVM exercise locks from the lock manager. youngsters, GFS makes exercise of locks from the lock supervisor to synchronize entry to filesystem metadata (on shared storage), whereas CLVM makes exercise 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 reliance on CLVM, otherwise you can exercise indigenous 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 exercise of indigenous RHEL OS options.

Fencing Infrastructure

Fencing too is a crucial component of every RHEL-primarily based cluster implementation. The main point of the fencing implementation is to gain inevitable facts integrity in a clustered ambiance.

really, to live certain records integrity, just one node can flee a cluster provider and entry cluster service facts at a time. the exercise of vim switches within the cluster hardware configuration makes it feasible 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 selfsame 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 every failure circumstances. software-primarily based watchdog timers are an alternative used to live certain 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 pertinent 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 soundless now not comprise any single factor of failure. maintaining this in mind, you occupy to eradicate any single component of failure out of your cluster design. For this intention, which you can region your servers somatic in two separate racks with redundant power substances. You too occupy to remove any single aspect of failure from the network infrastructure used for the cluster. Ideally, live certain you occupy at the least two community adapters on every cluster node, and two community switches should live 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 live 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 live building that cluster). when you've got a legitimate application subscription from crimson Hat, you could log in to the crimson Hat community, and disappear to application channels to down load the latest supplant attainable. Later, once you down load the ISO photographs, that you could sear it to CDs the usage of any commandeer utility. every the course through the RHEL OS installation, you're going to drag through a lot of configuration choices, essentially the most essential of which might live the date and time-zone configuration, the basis consumer password setting, firewall settings and OS security plane preference. an additional vital configuration alternative is network settings. Configuration of these settings can live 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 uphold pack, which is purchasable from h18004.www1.hp.com/products/servers/linux/dl740-drivers-cert.html).

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

once downloaded, the kit might live in tar layout. Extract it, after which install at least right here RPMs, so that the RHEL cluster with DLM can live set 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 exercise the community configuration GUI. youngsters, if you plot to gain exercise of Ethernet channel bonding, the configuration steps are by far 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 soundless disappear 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 outfit 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 outfit (for instance, /and so on/sysconfig/community-scripts/ifcfg-bond0), which might issue as if the following example:

    gadget=bond0 USERCTL=no ONBOOT=convincedBROADCAST=172.sixteen.2.255 network= NETMASK= GATEWAY= IPADDR=

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

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

    on account of these configuration steps, you're going to grow to live with two RHEL cluster nodes with IP addresses of 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 exercise 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 labor 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 meet 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

    # finish not eradicate the following line, or a number of classes # that require network performance will fail. 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 node1 node2 172.16.2.four KMETSM

    if in case you occupy an additional Ethernet interface in each and every cluster node, it's at every times a pleasant 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 soundless viable to gain exercise of other interfaces for extra heartbeat exchanges.

    For this classification of configuration, you with no worry can exercise the community configuration GUI to allot IP addresses—as an instance, and on eth2, and secure 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 too harmonize with configuring other fencing devices, depending on the hardware classification used to your cluster configuration.

    To configure HP ILO, you occupy to reboot your servers and press the F8 key to enter into the ILO configuration menus. primary configuration is relatively essential; you requisite to allot 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 with Commilo2 because the ILO outfit identify on node2. gain 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 exercise 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 live 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 obligate 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 sensible 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 live in a position to espy this array physically.

    To verify the genuine availability of shared storage for each cluster nodes, issue in the /dev/proc/proc file for an entry fancy /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 tiny basic partitions to dangle raw instruments, and a 3rd primary partition changed into created to dangle the shared statistics filesystem:

    Parted> select /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 soundless not live set within the /and so forth/fstab file on both cluster node, as this shared filesystem may live beneath the ply 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 pervert 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 live configured in lots of approaches. youngsters, the easiest fashion to configure a RHEL cluster is to gain exercise of the RHEL GUI and disappear 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 occupy one fence degree with one fence device. if you occupy dissimilar fence devices to your environment, that you can add one other fence degree with greater fence gadgets to each and every node.

    I too delivered a shared IP tackle of, which will live used because the service IP tackle for this cluster. here is the IP ply that additionally may soundless live used as the carrier IP tackle for purposes or databases (like for listener configuration, if you're going to exercise 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 set 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 live present within the /root listing on each cluster nodes. It is terribly crucial to occupy suitable ownership of root and security; otherwise, you could forecast unpredictable habits during cluster startup and shutdown.

    software or database startup and shutdown scripts are very significant for a RHEL-based mostly cluster to function appropriately. RHEL clusters exercise the selfsame scripts for featuring utility/database monitoring and exorbitant availability, so each software script used in a RHEL cluster may soundless occupy a specific format.

    All such scripts may soundless as a minimum occupy 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 soundless recrudesce a cost of 0, and when an software is not running or obtainable, it should recrudesce a worth of 1. The script too should soundless embrace a restart subsection, which tries to restart services if the software is discovered to live 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 lofty 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 reecho Now starting...... /root/CommunicationS.sh genesis reecho "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 soundless contain three elements: two deepest substances (one filesystem and one script) and one shared aid, which is the carrier IP ply for the cluster.

    The closing step is synchronizing the cluster configuration throughout the cluster nodes. The RHEL cluster administration and configuration implement offers a “store configuration to cluster” choice, with a view to look when you birth the cluster capabilities. hence, for the first synchronization, it is stronger to forward the cluster configuration file manually to every cluster nodes. You effectively can exercise 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 genesis cluster features on both cluster nodes. live certain 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 exercise GFS, startup/shutdown of the gfs and clvmd functions ought to live 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 trade requires 24/7 service availability, that you may finish that with ease by using the chkconfig command.

    an additional consideration is logging cluster messages in a special log file. via default, every cluster messages disappear 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 significant step is to specify the time length for rotating cluster log info. This can live 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 too occupy to pay special attention to keeping UIDs and GIDs synchronized across cluster nodes. here is essential in making certain suitable permissions are maintained, specially near to the shared records filesystem.

    GRUB additionally should conform to the suite ambiance's inevitable 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 selfsame RHEL cluster infrastructure can too live used for proposing exorbitant availability to databases, such as Oracle, MySQL and IBM DB2.

    essentially the most crucial component to remember is to groundwork 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 exercise an already-configured RHEL cluster to supply exorbitant availability to a MySQL database server, which is, tiny 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 requisite to define a failover belt the usage of the cluster configuration implement (with the cluster node of your option having a better precedence). This failover belt can occupy the MySQL provider, which, in turn, can occupy two inner most materials and one shared resource (the service IP tackle).

    some of the inner most components should live of the filesystem class (in my configuration, it has a mountpoint of /shared/mysqld), and the different private useful resource may soundless live of the script class, pointing towards the /and so on/init.d/mysql.server script. The contents of this script, which may soundless live 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 live attainable from each cluster nodes.

    checking out for prime availability of the MySQL database will too live carried out effectively with the succor 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 occupy been triggered, and the MySQL database immediately restarted on Commsvr2. This complete failover system took one to 2 minutes and happened quite seamlessly.


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

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