HP Process Resource Manager User's Guide

Configuring and enabling PRM on the command line
Configuring PRM
Chapter 7 123
Controlling disk bandwidth
You can add, modify, or delete disk bandwidth shares for each PRM
group as discussed in the following sections:
• “Adding/modifying disk bandwidth shares” on page 124
• “Removing disk bandwidth shares” on page 125
NOTE To take advantage of PRM’s disk bandwidth management, your disks
must be under the control of HP’s Logical Volume Manager (LVM) or of
VERITAS Volume Manager (VxVM). If you would like to use disk
bandwidth management, see “Setting up your disks” on page 85.
Disk bandwidth record syntax
You can specify a group’s disk bandwidth shares for a given logical
volume group (LVM) or disk group (VxVM) using disk records.
Disk records are optional. However, if one FSS PRM group has a disk
record for a volume group/disk group, then all FSS PRM groups must
have a disk record for that volume group/disk group. PSET PRM groups
do not have disk records. PSET PRM groups are treated as part of
PRM_SYS for disk bandwidth purposes.
NOTE Do not specify disk bandwidth records for configurations used inside
virtual machines.
Specify a disk record using the syntax:
VOLUME:{ PRMID | GROUP }:SHARES::
where
VOLUME Is the name of a logical volume group (LVM) or a disk
group (VxVM). This name must begin with /dev/v to
be recognized as a disk record.
PRMID | GROUP Is an FSS PRM group ID or group name that
corresponds to an existing group. When specifying
parents in a group hierarchy, use their names.