HP PRM Version C.03.05.01 release notes (B3835-90027), June 2010

4 Known problems and workarounds
This section discusses problems and workarounds for HP PRM Version C.03.05.
PRM does not support disk bandwidth management on VERITAS File System
(VxFS)
Issue PRM does not support disk bandwidth control on VxFS. The reason for this
limitation is that VxFS does not support the implementation of I/O disk bandwidth
that PRM relies on. The Unix File System (HFS) supported this feature, but when
HP moved to VERITAS File System 4.1, the daemon invalidated this feature for
all the current HP-UX versions.
Workaround There is no immediate fix or workaround known for this issue.
Degraded performance when starting via RC scripts
Issue When an initial configuration requesting memory management is loaded (after
installing or resetting PRM), PRM initializes memory resource groups (MRGs)
giving all usable memory to PRM_SYS initially. Any free memory is then distributed
to other PRM groups. This distribution of memory for use by your PRM groups
can be affected by:
• Heavy paging or swapping
• A single application using over half the lockable memory on the system
Such conditions may exist if memory-intensive applications start immediately after
PRM is configured—as may be the case with applications starting automatically
at reboot.
Workaround You can possibly avoid these issues by:
• Starting these applications in their designated PRM groups with the prmrun
command
• Using the PRM_SLEEP variable in your /etc/rc.config.d/prm file so that the
application manager and memory manager can place processes in their
configured groups before the heavy demand begins.
Application hangs in FSS group with capping enabled
Issue On HP-UX 11i v2 (B.11.23), an application inside an FSS group may hang when
running in a single-processor virtual partition, nPartition, or system if CPU capping
is enabled.
Workaround Install patch PHKL_33052.
Inconsistent inheritance
Issue If a process placed in a PRM group via prmrun, prmmove, or a record spawns
child processes, those child processes remain in the same PRM group as the
parent. However, if the child process matches a Unix group record, the process
is moved to the corresponding PRM group.
Workaround Consider using user records instead of Unix group records to maintain inheritance.
PRM does not support disk bandwidth management on VERITAS File System (VxFS) 13