Using Serviceguard Extension for RAC, 10th Edition, April 2013

3 Support of Oracle RAC ASM with SGeRAC
Introduction
This chapter discusses the use of the Oracle 10g Release 2 (10g R2) and11g Release 1 (11g R1)
database server feature called Automatic Storage Management (ASM) in configurations of HP
Serviceguard Extension for Real Application Clusters (SGeRAC).
We begin with a brief review of ASM—functionality, pros, cons, and method of operation. Then,
we look in detail at how we configure ASM with SGeRAC (version A.11.17 or later is required).
SGeRAC Support for ASM on HP-UX 11i v3
Overview
Support for ASM with 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
HPUX 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 10gR2 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 4):
Table 3 ASM support with SG/SGeRAC A.11.17.01 or later
Not SupportedSupported
Oracle single instance database, with or without Oracle
clusterware
Oracle RAC database
CVM Logical Volumes as ASM Disk Group MembersSLVM Logical Volumes as ASM Disk Group Members
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 Oracle 10gR2 RAC
Single instance Oracle database with ASM-managed
storage in SGeRAC configuration wherein SGeRAC
provides node membership to Oracle Clusterware
ASM configurations on SGeRAC using SGeRAC
A.11.17.01 or later, and 11g R1 RAC
Maximum SGeRAC cluster size for ASM configurations is
16
SGeRAC Toolkit3 framework based on Multi-Node Package
(MNP) /Simple Package Dependency to manage ASM
configurations on SGeRAC up to a maximum cluster size
of 16
Raw disks/disk array LUs as ASM Disk Group Members
96 Support of Oracle RAC ASM with SGeRAC