Using Serviceguard Extension for RAC, 9th Edition, September 2010

NOTE: 4.1 and later versions of Veritas Volume Manager (VxVM) and Dynamic Multipathing
(DMP) from Symantec are supported on HP-UX 11i v3, but do not provide multipathing and load
balancing. Instead, DMP acts as a pass-through driver, allowing multipathing and load balancing
to be controlled by the HP-UX I/O subsystem.
For more information about multipathing in HP-UX 11i v3, see the white paper HP-UX 11i v3
Native Multipathing for Mass Storage, and the Logical Volume Management volume of the HP-UX
System Administrator’s Guide at www.hp.com/go/hpux-core-docs—> HP-UX 11i v3.
About Device Special Files
HP-UX releases up to and including 11i v2 use a naming convention for device files that encodes
their hardware path. For example, a device file named /dev/dsk/c3t15d0 would indicate
SCSI controller instance 3, SCSI target 15, and SCSI LUN 0. HP-UX 11i v3 introduces a new
nomenclature for device files, known as agile addressing (also called persistent LUN binding).
Under the agile addressing convention, the hardware path name is no longer encoded in a storage
device’s name—each device file name reflects a unique instance number, for example /dev/
[r]disk/disk3, that does not need to change when the hardware path changes. Agile
addressing is the default on new 11i v3 installations, but the I/O subsystem still recognizes the
pre-11i v3 nomenclature. You are not required to migrate to agile addressing when you upgrade
to 11i v3, though you should seriously consider its advantages. It is possible, though not a best
practice, to have legacy DSFs on some nodes and agile addressing on others—this allows you to
migrate the names on different nodes at different times, if necessary.
NOTE: The examples in this document use legacy naming conventions.
Support for the SGeRAC Toolkit
The SGeRAC Toolkit provides documentation and scripts to simplify the integration of SGeRAC
and the Oracle 10g R2/11g R1/11g R2 RAC stack. It also manages the dependency between Oracle
Clusterware and Oracle RAC instances with a full range of storage management options supported
in the Serviceguard/SGeRAC environment. The framework provided by the SGeRAC toolkit is
unique in the high level of multi-vendor (Oracle, Symantec, HP) and multi-storage platform
(CFS, CVM, SLVM, ASM over SLVM) integration it offers (on HP-UX releases that support Veritas
CFS and CVM. See “About Veritas CFS and CVM from Symantec” (page 18).
The SGeRAC Toolkit uses multi-node packages and package dependency features to provide a
uniform, intuitive, and easy-to-manage method to coordinate between SGeRAC and Oracle
Clusterware.
Additionally, the SGeRAC Toolkit helps to manage all the storage options supported by
SGeRAC—CFS, SLVM, CVM, ASM (over SLVM), ASM over the raw device files on HP-UX 11i
v3 only. For more information, refer to the Serviceguard Extension for RAC Version A.11.20 Release
Notes at www.hp.com/go/hpux-serviceguard-docs —> HP Serviceguard Extension
for RAC .
SGeRAC Toolkit Maintenance Mode
This feature allows you to perform Oracle OC/ASMDG/RAC maintenance while OC/ASMDG/RAC
multi-node packages are running in the cluster. To enable this feature, MAINTENANCE_FLAG
should be set to “yes” in the OC MNP and RAC MNP package configuration files and oc.debug
and/or rac.debug file needs to be created under respective Multi Node Package working
directories.
Starting with version A.11.17, all log messages from cmgmsd log to
/var/adm/syslog/syslog.log by default
36 Serviceguard Configuration for Oracle 10g, 11gR1, or 11gR2 RAC