Veritas Storage Foundation™ 5.0.1 for Oracle RAC Installation, Configuration, and Administrator's Guide Extracts for the HP Serviceguard Storage Management Suite on HP-UX 11i v3

Identifying the Operating Environment
To identify the OE currently installed on a system:
• Run the swlist | grep OE command to identify the OE currently installed on your
system.
The output of this command includes a line that identifies the installed OE.
For example:
# swlist | grep HPUX|grep OE
HPUX11i-HA-OE B.11.31.0909 HP-UX High Availability Operating Environment
Required HP Patches
SGeRAC requires HP-UX depots and patches on each node before installation. For current
information, please refer to the HP Serviceguard Storage Management Suite Release Notes available
at: http://docs.hp.com/en/ha.html#HP%20Serviceguard%20Storage%20Management%20Suite
About CVM and CFS in an SGeRAC Environment
Before installing SGeRAC, you can review concepts on CVM and CFS to better understand the
overall setup and plan your SGeRAC configuration.
• “About CVM” (page 23)
• “About CFS” (page 24)
• “Coordinating CVM and CFS Configurations” (page 25)
• “About Shared Disk Groups” (page 25)
• “About Raw Volumes Versus CFS for Data Files” (page 26)
About CVM
Review CVM configuration differences from VxVM and CVM recovery operations.
CVM Configuration Differences
CVM configuration differs from VxVM configuration in these areas:
• Configuration commands occur on the master node.
• Disk groups are created (could be private) and imported as shared disk groups.
• Disk groups are activated per node.
• Shared disk groups are automatically imported when CVM starts.
CVM Recovery
When a node leaves a cluster, it can leave some mirrors in an inconsistent state. The membership
change is communicated through GAB to the vxconfigd daemon, which automatically calls the
vxrecover utility with the -c option when necessary.
CVM supports both the FastResync option and dirty region logging (DRL) as optional features
to improve resynchronization performance. FastResync improves performance when reorganizing
volumes (moving, splitting, and joining disk groups). This is useful when performing off-host
processing. DRL speeds up resynchronization after a node failure.
Special considerations exist when using the DRL in an SGeRAC environment. As in a non-clustered
environment, the DRL in clusters exists on a log subdisk in a mirrored volume. The size of the
DRL in clusters is typically larger than in non-clustered systems. The log size depends on the
volume size and the number of nodes. The vxassist command automatically imports a
sufficiently large DRL.
You can reimport a private disk group as a shared disk group but the DRL for any mirrored
volume in the disk group is probably too small to accommodate maps for all the cluster nodes.
About CVM and CFS in an SGeRAC Environment 23