HP Serviceguard Version A.11.18 Release Notes, September 2008

on HP-UX 11i v1 were the last versions that did). HP-UX 11i v3 does not support these
two technologies.
The unsupported configurations include physical Token Ring and FDDI interfaces,
Virtual LAN (VLAN) interfaces over FDDI or Token Ring, and failover groups of Token
Ring and FDDI interfaces in the LAN Monitor Mode of the APA product.
Parallel SCSI Dual Cluster Lock Obsolete
As of Serviceguard A.11.18, you must use Fibre Channel connections for a dual cluster
lock; you can no longer implement it in a parallel SCSI configuration. See “Dual Lock
Disk” in Chapter 3 of Managing Serviceguard for more information about dual cluster
locks.
Parallel SCSI Not Supported for Lock LUN
The new lock LUN functionality does not support parallel SCSI; you must use Fibre
Channel for a lock LUN. If you need to use parallel SCSI, use an LVM cluster lock disk,
or a Quorum Server.
See “About Lock LUNs” (page 45) for more information about lock LUNs. For more
information about the cluster lock, see “Cluster Lock” in Chapter 3 of Managing
Serviceguard.
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.
16 Serviceguard Version A.11.18 Release Notes