Using Serviceguard Extension for RAC, 7th Edition, September 2008

Multipath
Multipath is supported through either SLVM pvlinks or CVM Dynamic Multipath (DMP). In
some configurations, SLVM or CVM does not need to be configured for multipath as the multipath
is provided by the storage array. Since Oracle Cluster Software checks availability of the shared
device for the vote disk through periodic monitoring, the multipath detection and failover time
must be less than CRS's timeout specified by the Cluster Synchronization Service (CSS)
MISSCOUNT. On SGeRAC configurations, the CSS MISSCOUNT value is set to 600 seconds.
Multipath failover time is typically between 30 to 120 seconds (For information on Multipathing
and HP-UX 11i v3; “About Multipathing” (page 35).
OCR and Vote Device
Shared storage for the OCR and Vote device should be on supported shared storage volume
managers with multipath configured and with either the correct multipath failover time or CSS
timeout.
Mirroring and Resilvering
On node and cluster wide failures, when SLVM mirroring is used and Oracle resilvering is
available, the recommendation for the logical volume mirror recovery policy is set to either full
mirror resynchronization (NOMWC) or fast resynchronization (MWC) for control and redo files
and no mirror resynchronization (NONE) for the datafiles since Oracle would perform resilvering
on the datafiles based on the redo log.
NOTE: If Oracle resilvering is not available, the mirror recovery policy should be set to either
full mirror resynchronization (NOMWC) or fast resynchronization (MWC) of all control, redo,
and datafiles.
For more information on using NOMWC and MWC, refer to the HP-UX System Administrator's
Guide: Logical Volume Management HP-UX 11i Version 3 on http://docs.hp.com
Shared Storage Activation
Depending on your version of Oracle Cluster Software, the default configuration for activation
of the shared storage for Oracle Cluster Software may be controlled by the /var/opt/oracle/
oravg.conf file. For the default configuration where the shared storage is activated by SGeRAC
before starting Oracle Cluster Software or RAC instance, the oravg.conf file should not be
present.
Listener
Automated Startup and Shutdown
CRS can be configured to automatically start, monitor, restart, and halt listeners.
If CRS is not configured to start the listener automatically at Oracle Cluster Software startup, the
listener startup can be automated with supported commands, such as srvctl and lsnrctl,
through scripts or SGeRAC packages. If the SGeRAC package is configured to start the listener,
the SGeRAC package would contain the virtual IP address required by the listener.
Manual Startup and Shutdown
Manual listener startup and shutdown is supported through the following commands: srvctl
and lsnrctl
Network Monitoring
SGeRAC cluster provides network monitoring. For networks that are redundant and monitored
by Serviceguard cluster, Serviceguard cluster provides local failover capability between local
Interface Areas 29