Using Serviceguard Extension for RAC, 6th Edition, April 2008

Automated Oracle Cluster Software Startup and Shutdown
The preferred mechanism that allows Serviceguard to notify Oracle Cluster Software
to start and to request Oracle Cluster Software to shutdown is the use of Serviceguard
packages.
Monitoring
Oracle Cluster Software daemon monitoring is performed through programs initiated
by the HP-UX init process. SGeRAC monitors Oracle Cluster Software to the extent
that CSS is a NMAPI2 group membership client and group member. SGeRAC provides
group membership notification to the remaining group members when CSS enters and
leaves the group membership.
Allowed Characters for Oracle 10g RAC Cluster Names
Oracle Clusterware uses SGeRAC Group Membership Service to get the node status, it
registers a group in SGeRAC cmgmsd daemon with Oracle cluster name. Since the valid
group name in SGeRAC only allows alpha letter (a-z, A-Z), decimal digital (0-9),
underscore (_), dollar sign ($) and number sign(#), only these characters are allowed
in Oracle 10g Clusterware cluster name.
Shared Storage
SGeRAC supports shared storage using HP Shared Logical Volume Manager (SLVM),
Cluster File System (CFS) and Cluster Volume Manager (CVM); CFS and CVM are not
supported on all versions of HP-UX (on HP-UX releases that support them; see “About
Veritas CFS and CVM from Symantec” (page 25)).
The file /var/opt/oracle/oravg.conf must not be present so Oracle Cluster
Software will not activate or deactivate any shared storage.
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 45).
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.
Interface Areas 37