Support of Oracle RAC ASM with SGeRAC, January 2008

HP Availability Clusters Solutions Lab 1/25/2008 Page 11
In step 3, switch the volume group back to shared mode, using SNOR, and export the VG across the
cluster, ensuring that the right ownership and access rights are assigned to the raw logical volumes.
Activate the volume group, and restart ASM and the database(s) using ASM-managed storage on all
nodes (they are already active on node A).
SG/SGeRAC Support for ASM on HP-UX 11i v3
Overview
Support for ASM with SG/SGeRAC commences with SGeRAC A.11.17.01 on HP-UX 11i v3.
SGeRAC support ASM where the member disk groups are either logical volumes managed by HP
Shared Logical Volume Manager (SLVM) or raw disks/disk array logical units(LUs).
A new I/O infrastructure that enables the native built-in multipathing functionality is introduced in HP-
UX 11i v3. This feature offers users a continuous I/O access to a LUN or disk if any of the paths fails.
This feature is enabled in the operating system by default. In addition, new DSF(device special file)
format is introduced in this operating system. An example of new DSF is /dev/disk/disk1, compare
to the legacy DSF, /dev/rdsk/cxtydz.
Please note that it has been possible to set up Oracle databases using ASM on HP-UX from the time
Oracle 10g became available on HP-UX, using the following configurations that do not require
SG/SGeRAC:
• non-clustered single instance Oracle
• Oracle single instance and RAC databases running in a pure Oracle clusterware environment
The following requirements/restrictions apply to SG/SGeRAC (A.11.17.01 or later) support of ASM
(summarized in Table 2):
Table 2 : ASM support with SG/SGeRAC A.11.17.01 or later
SUPPORTED NOT SUPPORTED
Oracle RAC database Oracle single instance database, with
or without Oracle clusterware
SLVM Logical Volumes as ASM Disk
Group Members.
CVM Logical Volumes as ASM Disk
Group Members
ASM configurations on SGeRAC
using SGeRAC A.11.17.01 or later,
and Oracle 10g R2 RAC
Single instance Oracle database with
ASM managed storage running in
Serviceguard cluster.
ASM configurations on SGeRAC
using SGeRAC A.11.17.01 or later,
and 11g R1 RAC
Single instance Oracle database with
ASM-managed storage in SGeRAC
configuration wherein SGeRAC
provides node membership to Oracle
Clusterware.