Serviceguard Extension for RAC Version A.11.20 Release Notes, April 2011

1. If HP raw disks are being used for Oracle Clusterware and Database configuration, then you
can create cDSFs and use them directly.
2. The cluster running with Oracle clusterware and RAC Database related files on Shared Logical
Volume groups using persistent Device Special File (DSF) format can be migrated to use cDSF
without deactivating the volume groups (or halting OC/RAC MNP packages if they have been
configured).
3. It is recommended to refer to Oracle documentation for the Oracle commands to
change/update the raw disks with Persistent DSF format used for OCR/Vote/Database to
cDSF.
Limitations of cDSFs
• cDSFs are supported only within a single cluster. You cannot define a cDSF group that crosses
cluster boundaries.
• A node can belong to only one cDSF group.
• cDSFs are not supported by VxVM, CVM, CFS, or any other application that assumes DSFs
reside only on /dev/disk and /dev/rdisk.
• cDSFs do not support disk partitions. Disk partitions can be addressed by a device file using
the agile addressing scheme, but not by a cDSF.
For the new cluster setup, cDSF can be used for SLVM and Raw disks/LUNs. To migrate the existing
cluster/package to use cDSF, there will be a downtime associated with it.
For more information on cDSF and LVM commands, refer to the latest version of the Managing
Serviceguard manual.
Native Multipathing, Veritas DMP, and Related Features
The HP-UX 11i v3 I/O subsystem provides multipathing and load balancing by default. This is
often referred to as native multipathing. When CVM is installed on HP-UX 11i v3, DMP is the only
supported multipathing solution, and is enabled by default.
For more information about multipathing in HP-UX 11i v3, see the white paper HP-UX 11i v3 Native
Multi-Pathing for Mass Storage, and the HP-UX System Administrator's Guide: Logical Volume
Management HP-UX 11i Version 3 at
www.hp.com/go/hpux-core-docs —> HP-UX 11i v3.
What’s in this Version
• Patch PHSS_41642 for SGeRAC A.11.20 on HP-UX 11i v3
The patch supports the following new features
◦ SGeRAC toolkit modular style Oracle Clusterware Multi-Node package (OC MNP) and
Oracle RAC instance Multi-Node package (RAC MNP) can be configured through
Serviceguard Manager with minimal user inputs. The OC MNP and RAC MNP package
attributes will be discovered automatically. This requires Oracle Clusterware and RAC
database to be up and running on all the cluster nodes. In site-aware cluster, Oracle
Clusterware and RAC database to be up and running on all nodes of the site where easy
deployment of OC MNP and RAC MNP are attempted. Refer to the Serviceguard Manager
B.03.10 Online help pages for more information.
NOTE: To enable the this feature, Serviceguard A.11.20 patch PHSS_41628 or later
should be installed. This feature supports only Oracle 11gR2 RAC, CVM/CFS 5.0.1 or
later shared storage. If SGeRAC toolkit legacy OC MNP and RAC MNP packages are
configured then do not use this feature.
◦ The SGeRAC toolkit /opt/cmcluster/SGeRAC/toolkit/README file contents have been
moved to Using Serviceguard Extension for RAC user guide (published March 2011 or
What’s in this Version 9