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

or later) to support ASM on raw disks/disk array LUs. In HP-UX 11i v3, new DSF is introduced.
SGeRAC will support the DSF format that ASM support with the restriction that native multipathing
feature is enabled.
The advantages for “ASM-over-raw” are as follows:
• There is a small performance improvement from one less layer of volume management.
• Online disk management (adding disks, deleting disks) is supported with ASM-over-raw.
The disadvantages for “ASM-over-raw” are as follows:
• Might not see the HP-UX devices (raw disks/disk array LUs) used for disk group members as
the same names on all nodes.
• There is no protection to prevent the raw disks from being incorporated into VxVM volume/disk
groups.
Configure Raw Disks/Disk Array Logical Units for ASM Disk Group
Oracle provides instructions on how to configure disks for ASM where the member disks are raw
logical volume. The instructions to configure raw disks/disk LUs are the following:
For Oracle 10g R2, please refer to Oracle Database Installation Guide 10g Release
2 for hpux Itanium , Chapter 2, Preinstallation Tasks, section “Preparing Disk Group
for an Automatic Storage Management Installation.”
For 11g R1, please refers to Oracle Clusterware Installation Guide 11g Release 1
(11.) for HP-UX, Chapter 5, Configuring Oracle Real Application Clusters Storage,
section “Configuring Disks for Automatic Storage Management.”
Then, these raw devices can be used as disk group members to configure ASM disk group members
using Oracle database management utilities.
Additional Hints on ASM Integration with SGeRAC
This section includes some pointers that may be useful when deploying ASM in an SGeRAC
environment.
ASM may require Modified Backup/Restore Procedures
Backup/restore procedures for databases stored in ASM must make use of Oracle Recovery
Manager (RMAN), per Oracle documentation. Customers wishing to deploy ASM should ensure
that their backup/restore tools/scripts/procedures are compatible with this ASM requirement.
Installation, Configuration, Support, and Troubleshooting
Oracle ASM is part of the Oracle database server installation (both 10g R2 and 11g R1). No
additional software from HP is required to operate ASM in SGeRAC environment. Information on
how to use the optional MNP/Simple Dependency based SGeRAC Toolkit is separately documented.
Oracle ASM and ASM disk groups may be configured at the time of creating a database or as a
separate step. These tasks are carried out using Oracle database management tools, for example,
the database creation wizard dbca. In either case, ensure that SLVM volume groups and raw
disks/LUs have been prepared and activated prior to ASM disk group configuration or
reconfiguration, as discussed in this section. For SLVM, use the names of raw LVs contained in the
SLVM volume groups when Oracle commands and utilities require the specification of the names
of raw HP-UX devices for storing ASM disk groups.
For troubleshooting, it may be useful to look at subdirectories for database and ASM instances
under $ORACLE_BASE/admin/, where log and trace files for these instances are deposited.
Oracle clusterware deposits log and trace information regarding its management of ASM and
database instances under $ORACLE_HOME/log/<hostname>/racg.
100 Support of Oracle RAC ASM with SGeRAC