HP Serviceguard Version A.11.19 Release Notes, October 2009

Scope of Monitoring
The VxVM Volume Monitor detects the following failures:
• Failure of the last link to a storage device or set of devices critical to volume
operation
• Failure of a storage device or set of devices critical to volume operation
• An unexpected detachment or disablement of a volume
The VxVM Volume Monitor does not detect the following failures:
• Failure of a redundant link to a storage device or set of devices where a working
link remains
• Failure of a mirrored plex within a volume (assuming at least one plex is functional)
• Corruption of data on a volume which Veritas Volume Manager regards as enabled
and active
About vgchange -T
Serviceguard supports vgchange -T, which allows multi-threaded activation of
volume groups on HP-UX 11i v3 systems.
This means that when the volume group is activated, physical volumes (disks or LUNs)
are attached to the volume group in parallel, and mirror copies of logical volumes are
synchronized in parallel, rather than serially. That can improve a package’s startup
performance if its volume groups contain a large number of physical volumes.
To enable vgchange -T for all of a package’s volume groups, set
enable_threaded_vgchange to 1 in the package configuration file (the default is 0, meaning
that multi-threaded activation is disabled).
Note that, in the context of a Serviceguard package, this affects the way physical volumes
are activated within a volume group; another package parameter,
concurrent_vgchange_operations, controls how many volume groups the package can
activate simultaneously.
IMPORTANT: Make sure you read the configuration file comments for both
concurrent_vgchange_operations and enable_threaded_vgchange before configuring these
options, as well as the vgchange (1m) manpage.
Alternate Quorum Server Subnet
Serviceguard A.11.19 allows you to configure an alternate subnet for communication
between the cluster nodes and the Quorum Server. You can do this from the command
line or in Serviceguard Manager. For details and instructions, see the HP Serviceguard
Quorum Server Version A.04.00 Release Notes at http://docs.hp.com -> High
Availability -> Quorum Server.
Features Introduced Before A.11.19 45