HP Serviceguard Version A.11.18 Release Notes, September 2008

This command monitors a single volume at log level 0, with a polling interval of 10
seconds, and prints all log messages to the console.
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
With the patch listed under “New Features for September 2008 Patch” (page 20),
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 11.18, with the patches listed under “September 2008 Patch” (page 13)
allows you to configure an alternate subnet for communication between the cluster
What’s in this Release 51