HP Serviceguard Version A.11.19 Release Notes, October 2009

Cluster Name Restrictions
The following characters must not be used in the cluster name if you are using the
Quorum Server: at-sign (@), equal-sign (=), or-sign (|), semicolon (;).
These characters are deprecated, meaning that you should not use them, even if you
are not using the Quorum Server, because they will be illegal in a future Serviceguard
release. Future releases will require the cluster name to:
• Begin and end with an alphanumeric character
• Otherwise use only alphanumeric characters, or dot (.), hyphen (-), or underscore
(_)
Optimizing Performance when Activating LVM Volume Groups
If a package activates a large number of volume groups, you can improve the package’s
start-up and shutdown performance by carefully tuning the
concurrent_vgchange_operations parameter in the package configuration file (or control
script, for legacy packages).
Tune performance by increasing this parameter a little at a time and monitoring the
effect on performance at each step; stop increasing it, or reset it to a lower level, as soon
as performance starts to level off or decline.
Factors you need to take into account include the number of CPUs, the amount of
available memory, the HP-UX kernel settings for nfile and nproc, and the number
and characteristics of other packages that will be running on the node.
NOTE: Remember to do this exercise not only on the node on which the package will
normally run, but also on the node with the least resources in the cluster, as a failover
or other unexpected circumstances could result in that node running the package.
For more information, see the section “Optimizing for Large Numbers of Storage Units”
in Chapter 6 of the latest edition of Managing Serviceguard (in the High Availability
collection on docs.hp.com) and the comments in the package configuration file.
High Availability Consulting Services
Because Serviceguard configurations can be complex to configure and maintain, HP
strongly recommends that you use its high availability consulting services to ensure a
smooth installation and rollout; contact your HP representative for more information.
You should also work with your HP representative to ensure that you have the latest
firmware revisions for disk drives, disk controllers, LAN controllers, and other
hardware.
16 Serviceguard Version A.11.19 Release Notes