HP StorageWorks XP Cluster Extension Software Administrator Guide (T1656-96035, April 2010)

6 XP Cluster Extension and CLI
XP Cluster Extension allows integration into almost any cluster software for commercial UNIX, Linux,
and Windows operating systems. Use the XP Cluster Extension clxrun command to check proper
functionality of XP Cluster Extension prior to integration with the cluster software.
The CLI also allows integration of XP Continuous Access Software. For information on supported
platforms, see the HP SPOCK website: http://www.hp.com/storage/spock.
Configuring the CLI
Using the XP Cluster Extension CLI requires the following configuration steps:
1. Create the XP Continuous Access Software environment.
2. Create the XP RAID Manager configuration.
3. Create and configure the user configuration file.
Creating the Continuous Access environment and configuring XP RAID Manager
HP support personnel are trained and authorized to set up XP Continuous Access Software. You can,
however, configure and change XP disk pairs and XP RAID Manager instances using HP StorageWorks
XP LUN Manager, HP StorageWorks Command View XP, XP Remote Web Console, Command View
XP Advanced Edition Software, and XP RAID Manager. For detailed information on using these
programs, see the HP StorageWorks XP LUN Manager User's Guide, HP StorageWorks Command
View XP User's Guide, HP StorageWorks XP Remote Web Console User's Guide, HP StorageWorks
Command View XP Advanced Edition Software Device Manager Web Client User's Guide, and HP
StorageWorks XP RAID Manager User's Guide.
Timing considerations
XP Cluster Extension is designed to prioritize XP disk array operations over application service startup
operations. If XP Cluster Extension invokes disk pair resynchronization operations or gathers information
about the remote XP disk array, XP Cluster Extension waits until the requested status information is
reported. This prioritizes data integrity over application service startup and failover behavior.
Because the takeover timing depends on the configuration of your XP RAID Manager environment
and the settings in UCF.cfg, these considerations must be evaluated:
• XP Cluster Extension uses XP RAID Manager instances to communicate with the remote XP disk
array. Depending on the settings of the XP RAID Manager instance timeout parameter and the
number of remote instances, the online operation could time out. This can also happen if clxrun
is used in a script or called by another program and the local XP RAID Manager instance cannot
reach the remote XP RAID Manager instance. See “Setting up XP RAID Manager” on page 20 for
more information.
• If the ApplicationStartup attribute is set to RESYNCWAIT, XP Cluster Extension tries to resynchronize
disk pairs and waits until the XP RAID Manager device group is in PAIR state. In some versions of
XP RAID Manager and XP firmware, a full resynchronization is done. Depending on the amount
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