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IBM PowerHA SystemMirror Rapid Deploy Cluster Worksheets

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Published on 28 April 2014

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IBM Form #: TIPS1176

Authors: Dino Quintero and Michael Herrera

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    This IBM® Redbooks® Solution Guide is intended to assist with the rapid deployment of a IBM PowerHA® SystemMirror® V7 cluster by using the new clmgr command-line interface. It also provides examples of common administrative tasks, sample configuration files, and useful logs.


    The IBM® PowerHA® SystemMirror® V7 Cluster software is the next evolution of IBM AIX® clustering. To provide tighter integration with the AIX operating system, a new kernel level layer was developed that is called Cluster Aware AIX (CAA). The Cluster software uses this new foundation for its heartbeat and message communication. Running at this kernel level ensures that the cluster communication receives top priority and is not affected in the event of a memory leak or rogue application consuming systems resources.

    This redesign enables health monitoring across all of the network interfaces along with the ability to react to the loss of rootvg when booting from external SAN storage. In addition, new target mode capabilities in the Fibre Channel adapters allow for Storage Framework communication for health monitoring over the storage area network (SAN).

    This IBM Redbooks® Solution Guide is intended to assist with the rapid deployment of a PowerHA SystemMirror V7 cluster by using the new clmgr command-line interface. It also provides examples of common administrative tasks, sample configuration files, and useful logs.

    Figure 1 shows the IBM PowerHA SystemMirror V7 topology to show the components that are mentioned in this document.

    IBM PowerHA SystemMirror Version 7 topology

    Figure 1. IBM PowerHA SystemMirror V7 topology

    Did you know?

    The new clmgr utility in PowerHA SystemMirror V7 helps expedite the deployment of the cluster configuration. PowerHA SystemMirror V7 clusters may be created entirely from the new command-line interface (CLI).

    Business value

    The objective behind a high availability solution is to provide near-continuous application availability for both planned and unplanned outages. Business-critical applications are configured into a cluster, which typically has at least two systems (or nodes), and the cluster monitors the critical resources for changes that might indicate a failure, a pending failure, or a possible configuration change. The cluster is monitored for health and for configuration changes that must be made consistent across the cluster. A cluster can be configured for disaster recovery (DR) by providing clustering capabilities across geographically dispersed locations. As a preferred practice, data centers conduct periodic disaster recovery tests to demonstrate compliance with corporate policies. Compliance tests can be both operationally expensive (tying up critical resources during the test) and impact the business. Many companies simply cannot afford to have their IT operations unavailable for an extended DR test and therefore implement a cluster to simplify and shorten the test.

    All high availability products provide the same basic functions for monitoring and recovery of mission-critical applications. The strength of PowerHA for AIX lies in its tight integration with AIX and IBM Power Systems™ hardware. General-purpose solutions that run on many different hardware platforms and operating systems can offer only the least common denominator set of features. No other product can provide the features, performance, and reliability of PowerHA on IBM Power Systems servers and AIX.

    PowerHA SystemMirror Standard Edition and PowerHA SystemMirror Enterprise Edition with Cluster Aware AIX (CAA), kernel-based health management, Graphical Management, IBM HyperSwap®, and other integrated features, provide a robust high availability disaster recovery (HADR) environment that is focused on ease of implementation and ease of use.

    Solution overview

    Although the new clmgr utility in PowerHA SystemMirror V7 helps expedite the deployment of the cluster configuration, here is a cluster resource checklist that you might find useful when you plan to implement an IBM PowerHA SystemMirror high availability clustering solution:
    • IP address planning:
      • Request IPs (number of boot/base, persistent, and service IPs).
      • Register DNS names.
      • Update configuration files: /etc/hosts and /etc/cluster/rhosts.
      • Hard set IPs on the network interfaces.
    • Shared storage planning:
      • Determine space requirements (number of data LUNs, and the size of the cluster repository disk).
      • Identify driver and multipath requirements.
      • Determine the LUN mappings / SAN zoning.
      • Create / import shared volume group, logical volume, and file system information. Use unique names for resources that are imported across cluster members.
      • (optional) Identify and implement requirements for SANCOMM.
    • Highly available applications planning:
      • Identify installation location and space requirements.
      • Identify user and permission settings.
      • Test and deploy application start / stop scripts.
      • (optional) Test and deploy application monitoring scripts.
    • PowerHA SystemMirror cluster deployment:
      • Identify and install AIX level requirements (including CAA and RSCT packages) on all nodes.
      • Identify and install PowerHA SystemMirror code level on all nodes.
      • Reboot LPARs to pick up kernel bos updates.
    • From node 1:
      • Define a cluster name.
      • Define a cluster Repository Disk.
      • Define a multicast address (automatic or manual).
      • Define node names.
      • Define networks.
      • Define interfaces.
      • Define application controllers.
      • Define service IPs.
      • Define resource groups.
      • Define resources to the resource group (RG)
      • Verify / Synchronize the cluster.
      • Start cluster services on all nodes.
    • Fallover testing: Graceful stop with Takeover and RG moves (soft) versus reboot –q (hard)
    • Monitor the environment through different available tools.

    Prepare the following configuration files:
    • /etc/hosts

    • The contents of this file should include all of the cluster IP addresses and their corresponding IP labels, as it is preferable to have the cluster resolve locally and then revert to DNS if necessary.
    • /etc/cluster/rhosts

    • Populate the file on both nodes and refresh the cluster communication daemon (by running refresh –s clcomd). Explicitly defined cluster IPs in each line help avoid name resolution issues. Ensure that only valid, accessible cluster IPs are defined in this file.
    • /usr/es/sbin/cluster/

    • This file is used by the cluster in single adapter networks to attempt to determine adapter status in the event of a failure. Virtualized environments should deploy this file to point to default gateways or IPs outside of the physical frame to validate outside connectivity.

    Prepare and check the following IP addresses:
    • Multicast address (automatically or manually assigned)

    • The cluster heartbeat on PowerHA SystemMirror V7 clusters uses IP multicasting and by default assigns a multicast address during the cluster creation process. It attempts to avoid duplication across clusters by defining an address that is based on the first IP that it detects on your network interfaces. For example, en0 – base IP results in a multicast address. If you want to define your own multicast address, you may do so during that portion of the cluster configuration. PowerHA SystemMirror V7.1.3 makes this multicast requirement optional.
    • Base IP addresses

    • Every adapter in AIX typically has an IP address on it stored in the object data manager (ODM) and set to come online during the system boot sequence. These adapters can be defined within the cluster definitions as base / boot adapters if they are to be within a PowerHA network. CAA attempts to use all interfaces within the LPAR unless the administrator has explicitly defined them in a PowerHA private network. VLANs that have interfaces that host a potential service IP must have IP multicasting enabled, otherwise CAA considers these interfaces down and never attempts to acquire the service IP alias.
    • Persistent IPs

    • This is a cluster node-specific alias that is available on system boot whether PowerHA services are running or not. These IPs can be used as administrative IPs for each node or as IPs to hold the route for the routable subnet in the event of a cluster failover. For some time now, PowerHA has allowed single adapter networks to define the base/boot IP and service IPs on the same routable subnet, so the need for a persistent IP is not as prevalent as in earlier releases, so they are not typically required.
    • Service IPs

    • Any defined service IP address aliases are managed by the cluster if they are defined within a resource group. Where the resource group and its corresponding resources are being hosted determines the location of the service IP alias or aliases.

    Prepare and check the following shared disks configurations:
    • CAA repository disk (size requirement: minimum 512 MB to a maximum of 460 GB)

    • This is a new CAA requirement that must be visible to all cluster members. The common practice is for this LUN to be defined as a standard LUN size in the environment if it is within the minimum and maximum size requirements. At the time of the first verify and synchronize operation, the cluster creates a private volume group on the device.
    • Shared data volumes

    • All cluster managed shared volume groups must be created or converted to Enhanced Concurrent Mode and mapped and imported onto all cluster nodes. The corresponding LUNs should be defined to have no reservations set in their back-end multipath drivers. During cluster processing, the cluster manages the devices with its own disk fence registers, and allows only file systems to mount on the node hosting the resource group.

    Also, check the cluster resource group policies. A resource group in the cluster configuration is a container for the different highly available resources. The different resource group start, fallover, and fallback policies should be established during the planning phase, and should be fully understood, as shown in Table 1.

    Table 1. Resource group startup, fallover & fallback policies

    Resource group policyAvailable options
    Start policyOnline on home node only
    Online on first available node
    Online using distribution policy
    Online on all available nodes
    Fallover policyFall over to the next priority node in the list
    Fall over using dynamic node priority
    Bring offline
    Fallback policyFall back to higher priority node in the list
    Bring offline

    Prepare and check the following clustered application controller definitions:
    • Start and stop scripts

    • The application controller scripts must be in a common path in all participating cluster members. They must also be executable by the root user. The content of the scripts does not need to match between all cluster members. However, if the content needs to match based on application requirements, then the PowerHA file collection function may be used to ensure that changes are synchronized automatically between the cluster members every 10 minutes.
    • (Optional) Application monitoring scripts

    • The Cluster software delivers an optional application monitoring framework that can be used in any deployment. The cluster runs a clappmon process for every monitor that is defined on the node hosting its resource group and corresponding application controller. Any monitor scripts should be executable by root, be thoroughly tested, have proper script termination, and be in a common location on all cluster members.
    Here is a useful checklist for Cluster Aware AIX (CAA) heartbeat communication:
    • Repository disk

    • PowerHA SystemMirror V7 cluster communication requires the use of a shared LUN (repository disk) for heartbeating and to store cluster configuration information. The size requirement for the PowerHA SystemMirror V7.1.1 and V7.1.2 releases are a minimum size of 512 MB, with up to 460 GB. It is common for clients to use their standard LUN size rather than designating a volume smaller than their current data LUNs.
    • IP interfaces

    • CAA based releases before PowerHA SystemMirror V7.1.3 require the enablement of IP multicasting on the layer 2 devices backing the network interfaces. CAA uses all the interfaces on the system by default unless they are defined to an HA private network. IP network definitions are required for the cluster to perform IP address takeover between the cluster members. The cluster does not bring a service IP alias online on an interface if multicast communication is not working (in a release relaying on multicast communication) because the interface is considered unavailable.
    • (Optional) Storage framework communication (SANCOMM)

    • SAN-based communication is an additional heartbeating option in PowerHA SystemMirror V7 clusters. If properly enabled, the storage framework communication passes heartbeats between the Fibre Channel adapters within the shared SAN environment to provide an additional heartbeat communication path. This configuration is supported only over SAS or 4 GB and 8 GB Fibre Channel adapters, and works in dedicated host-based adapters (HBAs) or virtualized adapters using VSCSI or NPIV.

    On the supported HBAs, you must enable target mode on the LPARs that own the cards and ensure that the SAN zoning provides visibility between all applicable adapters in all cluster members. To do so, run the following commands:

    chdev –l fscsi# -a dyntrk=yes –a fc_err_recov=fast_fail –P
    chdev –l fcs# -a tme=yes –P (a reboot is required)

    Note: The –P option is used to update only the AIX ODM when there are existing child devices on the HBAs, which is why a reboot is required for the setting to take effect.

    Virtualized environments require the use a reserved Ethernet VLAN (3358) between the client LPARs and the corresponding virtual I/O (VIO) servers. A virtual Ethernet adapter must be defined on the client LPAR and on the VIO server to create a bridge that allows SAN heartbeat communication to reach the physical HBAs on the VIO servers. The virtual Ethernet adapters are not required to have an IP address defined on them.

    For the storage packets to pass between cluster members that are defined across physical server frames, the SAN zoning must include all corresponding HBA worldwide port names (WWPNs). In a virtualized environment, the physical WWPN for the HBAs in each VIO server (not the client virtual WWPNs) must be defined within the same SAN zone. Review the current online documentation or recent IBM Redbooks publications (refer to the "Related information" section) for examples using this feature.

    Solution architecture

    With each product release, some of the most common questions that arise include the following ones:
    • Which release should you install/use?
    • What are the key features that make it worthwhile to install the latest release?

    The complete list of new features is outlined in the product announcement letters, documentation, and IBM Redbooks publications. However, some key features that might impact which release to deploy are shown in Table 2.

    Table 2. Differences between PowerHA SystemMirror V7 releases
    Version considerationsAvailable updates in the different Version 7 releases
    Minimum operating system requirementsIf the environment is not running the minimum code levels that are outlined in this table, you cannot install that release. The decision about which PowerHA SystemMirror release to implement often revolves around the certified and installed AIX levels for the environment in question.
    Heartbeating protocolEarly PowerHA SystemMirror V7 clusters changed the cluster’s communication protocol to use IP multicasting and made it a fixed requirement for communication between the network interfaces. PowerHA SystemMirror V7.1.3 relaxes that requirement by using Unicast by default and optionally allowing for IP Multicast communication.
    Host name changesCAA initially did not accept a system host name change during fallover operations without having to re-create the cluster. PowerHA SystemMirror V7.1.3 ignores temporary host name changes by default to provide greater flexibility.
    Site-specific IPs for IP address takeover (IPAT) in local clustersBefore PowerHA SystemMirror V7 releases, a client could use the Standard Edition of the product, define sites, and use site-specific IPs for IPAT in environments where the local cluster members were in separate IP network segments. PowerHA SystemMirror V7.1.2 and later can define site definitions in a stretched cluster topology, which brings back the capability for PowerHA SystemMirror V7 clusters that are using only the Standard Edition but require the use of site-specific IPs.
    Application scripts (Smart Assistants)These configuration wizards detect installed applications and generate a cluster configuration with start/stop/monitor scripts. The most current PowerHA SystemMirror release typically supports the most recent application versions.
    Disaster recovery (DR) - Automation requirementsFor Cluster Aware AIX (CAA) based PowerHA SystemMirror releases, the Enterprise Edition was not made available until Version 7.1.2. For integration and automated handling of an IP or storage level replication offering, an Enterprise Edition release is required.
    Disaster recovery (DR) - Tie breaker supportThe ability to define an external LUN in to the cluster with different Split | Merge policies was introduced in PowerHA SystemMirror V7.1.2. This feature enables the support of SCSI reservations to enforce which site remains active in the event of a loss of communication.
    Disaster recovery (DR) - Fallover user confirmationPowerHA SystemMirror V7.1.3 introduced the ability to define “MANUAL” Split | Merge policies that enable PowerHA administrators to control the behavior of a fallover in an environment using site definitions.

    Here are some additional highlights:
    • CAA interface monitoring enhancements with the clras command (PowerHA SystemMirror V7.1.2)
    • CLI enhancements to clmgr (PowerHA V7.1.2 | PowerHA SystemMirror V7.1.3)
    • Flexibility to suspend CAA daemons to release the disks during multipath driver updates (PowerHA SystemMirror V7.1.3),
    • DS8800 HyperSwap single node, ACTIVE/ACTIVE, and HyperSwap support in an LPM capable environment (PowerHA SystemMirror V7.1.3)

    Usage scenarios

    PowerHA SystemMirror V7 clusters may be created entirely from the new CLI. In this example, IPs already are appended to the /etc/hosts file, the volume group already is imported in to all cluster members, and the application scripts already are written and propagated to the common /usr/local/hascripts directory in each of the cluster nodes. Resource group policies in this example are set to the most commonly used policies of Online on Home Node Only (this is the default in the command, so its input is not required), Fallover to the Next Available Node, and Never Fallback. The syntax options in the example may be modified to include additional cluster features.

    The following CLI rapid deployment instructions create a basic two node cluster. Table 3 shows the network parameters that used for the two-node cluster.

    Table 3. Network parameters for the two-node cluster



    Table 4 shows the resource group names that are used for the two-node cluster configuration.

    Table 4. Resource group names
    Resource group namesDB_app1_rg
    Startup policyOnline on Home Node Only
    Fallover policyFallover to the Next Priority Node
    Fallback policyNever Fallback
    Participating nodesnodea nodeb
    Service IP labelssharedIP
    Volume groupssharedvg
    Application controllersDB_app1

    To create the two-node cluster, complete the following steps:
    1. Create a cluster by running the following command: clmgr add cluster SampleCluster repository=hdisk10,
    2. Add a service IP by running the following command: clmgr add service_ip sharedIP network=net_ether_01
    3. Define an application controller by running the following command: clmgr add application_controller DB_app1 startscript=”/usr/local/hascripts/” stopscript=”/usr/local/hascripts/”
    4. Create a resource group by running the following command: clmgr add rg DB_app1_rg, startup=ohn fallback=nfb service_label=sharedIP volume_group=sharedvg application=DB_app1
    5. Verify and synchronize cluster by running the following command: clmgr sync cluster

    Note: The CAA private volume group that is created on the Repository Disk shows up only after the first time that the cluster definitions are synchronized. This is a "hands-off" volume group and should not be modified, mirrored, or extended through AIX LVM.

    Common administrative tasks, sample configurations, and logs

    This section provides commands and menu commands that are used during common administrative tasks while implementing and managing the PowerHA SystemMirror cluster. The command syntax often may allow for different options to achieve the same behavior. In particular, the clmgr command is loaded with useful tips.
    • PowerHA SystemMirror SMIT menus:
      • smitty sysmirror
      • smitty cl_admin
    • Start Cluster Services (different choices):
      • clmgr start cluster
      • clmgr online node nodea
      • clmgr start node nodea
      • smitty clstart
      • clmgr start cluster START_CAA=yes
    • Stop Cluster Services:
      • clmgr stop cluster
      • clmgr offline node nodea
      • clmgr stop node nodea
      • smitty clstop
      • clmgr stop cluster STOP_CAA=yes
    • Verify / Synchronize Cluster:
      • clmgr verify cluster
      • clmgr sync cluster
    • Move Resource Group: (different choices)
      • clmgr move rg rgA, rgB node=nodeA With multiple resource groups (RGs), the move is done serially.
      • clRGmove –g RGname –n nodeA –m
    • Add an application monitor:
    • clmgr add mon appA_mon TYPE=Custom APPLICATION=appA MONITORINTERVAL=60 FAILUREACTION=fallover STABILIZATION=300 RESTARTINTERVAL=1200 CLEANUPMETHOD=/usr/local/hascripts/ RESTARTMETHOD=/usr/local/hascripts/ RESTARTCOUNT=3 MONITORMETHOD=/usr/local/hascripts/

    • Suspend / Resume Application Monitoring:
      • clmgr manage application_controller suspend test_app1
      • clmgr resume application_controller resume test_app1
    Note: The syntax that is used in this document is intended to show some of the options within the new CLI. There are many additional granular options that are available for the commands. For an extensive list of syntax options and examples, run clmgr –help or man clmgr.
    For many of the commands, there are available aliases that allow for a shorter version of the command, such as file_system (alias fs), move (alias mv), and sync (alias sy).
    • Add disks in to a Volume Group:

    • clmgr modify volume_group dataVG add=hdisk3
    • Add a Logical Volume:

    • clmgr add lv new_lvname type=jfs2 volume_group=dataVG logical_partitions=10
    • Add a file system (previously defined lv):

    • clmgr add fs /fsname type=enhanced logical_volume=prev_created_lv lv_for_log=INLINE inline_log_size=4
    Note: The clmgr operation automatically mounts the file system and update the ODM and /etc/filesystems file in the other cluster nodes. If the Volume Group is already defined to a resource group, the cluster automatically manages the file system.
    • Validate IP multicast traffic: (must be run on each node):

      • mping –v –r –a (nodeA – receive flag)
      • mping –v –s –a (nodeB – send flag)
    Note: In AIX V6.1 TL9 and AIX V7.1 TL3, usability is enhanced to allow users to specify the IP address of the interface they want to mping on (–b <addr>). In previous versions, the commands report back as successful if the software could mping down one of the interfaces on the server.
    • Display / Modify tunables:

      • clctrl – tune –L Displays default and sets tunable values.
      • clcmd netstat –in Displays all interfaces and IPs from all cluster nodes.
      • clcmd lspv Displays all PVIDs and VG information from all cluster nodes.
    Note: For the Cluster Aware AIX (CAA) enhanced usability, the bos.cluster.rte CAA package introduces the clcmd command. This command allows administrators to add it before their commands and collection information from all cluster nodes from a single window.
    • Replace a repository disk:
    clmgr replace repository new_disk

    Here are some commands that provide useful information to verify, monitor, and check the PowerHA SystemMirror cluster status:
    • To find the product version:

      • halevel –s
      • lslpp –l
      • lssrc –ls clstrmgrES | grep fix
      • clmgr query version
    • To query cluster settings and status:

      • clmgr query cluster
      • clmgr –v –a name,state,raw_state query node
      • lssrc –ls clstrmgrES | grep state
      • clshowsrv –v
    • To display a cluster configuration:

      • cltopinfo
      • clmgr view report basic
      • cllsif | clshowres Cluster Topology | Resource Group configuration legacy commands
    • To find the location of resources:

    • clRGinfo –p
    • Cluster Aware AIX (CAA) commands:

      • lscluster –c Cluster configuration (multicast address)
      • lscluster –i Status of cluster interfaces
      • lscluster –d Cluster storage Interfaces
      • lscluster –m Cluster node configuration information
      • lscluster –s Cluster statistics

    Note: SANCOMM is working only if sfwcom is visible in the lscluster –m output as follows:

    Interface State Protocol Status
    dpcom DOWN none RESTRICTED
    en0 UP IPv4 none
    sfwcom UP none none

    # clras sancomm_status
    NAME UUID STATUS | e9b4d6a4-5e71-11-e2-af42-00145ee726e1 | UP |

    You can also check the sent and received storage packet counts by running the lscluster -s command:

    # lscluster –s | grep storage
    storage pkts sent: 168493709 storage pkts recv: 82575360

    Here are sample configuration files that you can use while configuring and managing a PowerHA SystemMirror high availability cluster:
    • /etc/cluster/rhosts

    • /etc/hosts
    • loopback
      # PowerHA SystemMirror Cluster IP Addresses nodea # node A base address nodea # node B base address shared_IP # Shared
      SAN Volume Controller IP address
    • /etc/netsvc.conf
    • hosts= local, bind
    • /etc/resolv.conf
    • nameserver
    • /usr/es/sbin/cluster/
      !REQD <owner> target References /usr/sbin/rsct/samples/hats/
      !IBQPORT <owner> Documentation APARs: IZ01332 IZ01332
      !IBQPORTONLY <owner>

    Here are sample application controller scripts:
    • /usr/local/hascripts/
    • #!/bin/ksh
      su – orastst –c “lsnrctl start” Basic SAP example
      su – tstadm –c “startsap”
      exit 0
    • /usr/local/hascripts/
    • #!/bin/ksh
      su – tstadm –c “stopsap” Basic SAP example
      su – oratst –c “lsnrctl stop”
    • /usr/local/hascripts/
    • #/bin/ksh
      …user provided logic ….
      exit 0

    Here are useful cluster log files for monitoring and troubleshooting the highly available cluster:
    • /var/hacmp/log/hacmp.out Detailed EVENT processing

    • Aug 14 16:34:49 EVENT START: node_up nodea
      :node_up [165] [[ high==high ]]
      :node_up [165] version=
      :node_up [167] node_up_vg_fence_init
    • /var/hacmp/adm/cluster.log High-level cluster EVENTs

    • Aug 14 16:34:49 nodea user:notice PowerHA SystemMirror for AIX: EVENT START:
      node_up nodea
      Aug 14 16:34:51 nodea user:notice PowerHA SystemMirror for AIX: EVENT COMPLETED:
      node_up nodea
    • /var/hacmp/log/clutils.log Generated by cluster utilities

    • CLMGR STARTED (9153:10254698:5177392) : Thu Aug 14 16:34:49 CET 2013
      CLMGR USER (9153:10254698:5177392) : ::root:system
      CLMGR COMMAND (9153:10254698:5177392) : clmgr online node nodea
      CLMGR ACTUAL (9153:10254698:5177392) : start_node nodea
    • /var/adm/ras/syslog.caa CAA logging and troubleshooting
    Aug 14 16:34:28 nodea caa:info syslog: caa_query.c cl_get_capability 2594
    There are two more capabilities that are defined at level 131072
    Aug 14 16:34:49 nodea caa:info syslog: caa_query.c cl_get_capability 2594
    There are two more capabilities that are defined at level 131072

    Also, the following log files are useful to check while monitoring and troubleshooting the highly available cluster:
    • /var/hacmp/clverify/clverify.log Detailed verification check output
    • /var/hacmp/clcomd/clcomd.log Troubleshooting communication issues
    • /var/hacmp/log/cspoc.log.long Detailed information from CSPOC
    • /var/hacmp/log/clstrmgr.debug Generated by the clstrmgr daemon
    • /var/hacmp/log/autoverify.log Generated by nightly verification

    Supported platforms

    PowerHA SystemMirror V7 is supported on the AIX V6.1 and AIX V7.1 operating systems. Here are the specific software requirements for PowerHA SystemMirror V7.1.3:

    Operating system (one of the following):
    • AIX V6.1 Technology Level 9 with Service Pack 1
    • AIX V7.1 Technology Level 3 with Service Pack 1

    The Cluster Aware AIX (CAA) kernel layer was introduced in AIX V6 TL6 and in the base AIX V7 code release. Each release has different AIX prerequisite levels to install the Cluster software, as shown in Table 5.

    Table 5. PowerHA SystemMirror releases
    PowerHA SystemMirror releaseGeneral announcement (GA) dateMinimum AIX level
    PowerHA SystemMirror V7.1.0September 2010AIX V7.1 with RSCT
    AIX V6.1 TL6 SP1 with RSCT
    PowerHA SystemMirror V7.1.1December 2011AIX V7.1 TL1 SP3 with RSCT
    AIX V6.1 TL7 SP3 with RSCT
    PowerHA SystemMirror V7.1.2November 2012AIX V7.1 TL2 SP1 with RSCT
    AIX V6.1 TL8 SP1 with RSCT
    PowerHA SystemMirror V7.1.3December 2013AIX V7.1 TL3 SP1 with RSCT
    AIX V6.1 TL9 SP1 with RSCT

    The packages that are required for CAA functionality include the following ones:
    • bos.cluster.rte
    • bos.ahafs
    • bos.cluster.solid (No longer required beyond Version 7.1.0)

    Ordering information

    For ordering, contact your IBM sales representative, an IBM Business Partner, or IBM Americas Call Centers at 800-IBM-CALL (Reference: RE001).

    Ordering information is shown in Table 6.

    Table 6. Ordering program name, program number, and version
    Program namePID numberCharge unit description
    IBM PowerHA SystemMirror Enterprise Edition5765-H377.1
    IBM PowerHA SystemMirror Standard Edition5765-H397.1

    Related information

    For more information, see the following documents:

    On this page, enter IBM PowerHA SystemMirror for AIX offers solutions for high availability and disaster recovery for clusters, select the information type, and then click Search. On the next page, narrow your search results by geography and language.

    It is the goal of the IBM development team to continue to deliver product features that our clients demand and that provide the highest levels of resiliency. Feedback can be provided at any time by emailing


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