HP Serviceguard Storage Management Suite Version A.01.01 Release Notes, September 2008

Dirty Region Logging (DRL) for Mirrored Volumes
If a system failure occurs while mirrored volumes are in use, the mirrors will recover and clean
up any writes that were in progress when the system failed. The Dirty Region Logging (DRL)
feature tracks writes that are in progress to reduce the recovery effort after a system failure.
Without DRL, the entire volume must be recovered, because there is no way to determine which
blocks had writes in progress at the time of the system failure. The recovery operation is I/O
intensive and can be time consuming, depending on the number of volumes and how large they
are. In a clustered environment the IO performance of multiple nodes using the same volume
will be impacted during recovery. HP strongly recommends that you use DRL with mirrored
data volumes in a clustered environment to enable faster volume recovery. However, Oracle
database volumes should be configured without DRL, because the Oracle database application
keeps its own logs and does not require VxVM to maintain logs. For information on DRL and
the Veritas™ SmartSync Recovery Accelerator, see the Veritas Volume Manager 4.1 Administrator’s
Guide.
HP-UX Operating Environment Upgrade Limitations
When you purchase an HP Serviceguard Storage Management Suite (SG SMS) Operating
Environment (OE) bundle, the SG SMS software is provided on one DVD and the HP-UX OE
(Mission Critical - MCOE, Data Center - DCOE, or High Availability - HAOE) is provided on a
separate DVD.
The software provided on the SG SMS DVD relies on products and filesets that are provided on
the OE DVD, including HP Serviceguard and the Veritas Storage Foundation products. Each SG
SMS version relies on specific versions of HP Serviceguard and the Veritas Storage Foundation
products that can change with new OE releases.
The software on the SG SMS DVD is installed using swinstall. If an HP-UX OE is installed on
your system and you attempt to install a SG SMS version that is not supported with the versions
of Serviceguard and Veritas Storage Foundation included with the OE, swinstall will detect
the incompatible software and the installation will fail.
The software on the OE DVD is installed using update-ux. If a SG SMS bundle is installed on
your system and you attempt to install or upgrade to an OE version that includes Serviceguard
and Veritas Storage Foundation versions that are not supported with the SG SMS bundle,
update-ux will not detect the incompatible software. The installation will complete, but the
Serviceguard cluster will not start, or you will not be able to access the Veritas volumes.
update-ux does not check for software dependencies.
See “Compatibility Information and Installation Requirements” (page 16) for more information
on bundle upgrades.
HP Serviceguard Cluster File System for RAC T2777BA VxFEN JAGaf97359 (SR8606439372)
• What is the limitation? Error when starting Serviceguard packages. This problem occurs when
LANG is set to ja_JP.SJIS. Failure causes SG-CFS-pkg to fail to start up and causes a TOC of
the box with the following messages in syslog.
VXFEND: open(): Unable to open I18N message catalog
/opt/VRTSvcs/vxfen/ (error code: 9)
• What is the workaround? Set the export VCSI18N_LANG=en or LANG=C.
Oracle Data Manager Limitation for Bundles T2776BA, T2796BA, T2777BA, and T2797BA
• What is the limitation? Single instance Oracle databases are not permitted outside of
Serviceguard packages in environments using T2776BA, T2796BA, T2777BA, and T2797BA.
Known Problems and Workarounds 25