Storage Management Foundation User's Guide

HP NonStop Storage Management Foundation User's Guide—523562-008
6-1
6 Pool Management
During migration of data to SMF, it can be necessary to alter the set of disks assigned
to a pool, either by deleting a disk or by consolidating two pools (see Section 4,
Migration Guidelines for details.) Even after the initial migration, you might need to
make adjustments in pool configuration. For example, if many small pools were initially
configured, for example by SMCONVRT, the additional resources required for all those
pool processes could impact system performance. By consolidating pools, the number
of pool processes required can be reduced.
This section contains these topics:

Pool Consolidation on page 6-1

Removing Disks From a Pool on page 6-5

Renaming a Physical Disk in a Pool Containing VDP Catalog on page 6-7
Pool Consolidation
Suppose you configured your system so that it has one pool for every physical disk
that you migrated. While this is a simple way to configure your system, it does not
permit file relocation, and it results in two additional processes (a pool process and a
virtual disk process) for every physical disk that you migrated. You might decide that a
smaller number of multidisk pools is a more efficient configuration. You could back up
all the data, delete the SMF configuration, and start over, but that option is inefficient. A
faster and simpler approach would be to consolidate pools without moving any of the
data.
The following example shows how two pools could be consolidated. Before executing
the steps, the SMF subsystem must be running, including $ZSMS, the pool processes
and the virtual disk processes.
In this example, we have two pools, $P1 and $P2. Pool $P1 contains physical disk $D1
and virtual disk $V1. Pool $P2 contains physical disk $D2 and virtual disk $V2. Files
have been created on both virtual disks. Our goal is to consolidate $P2 into $P1 so that
$P1 contains physical disks $D1 and $D2 and virtual disks $V1 and $V2. After
consolidation, $P2 can be deleted.
For D-series systems, use COUP and PUP commands as follows:
1. Obtain the catalog location for pool $P2:
PUP SHOWPOOL $P2
The system responds:
NAME CATALOG LOC Adt Mrr Mag Dsk DInt Ext Eint Updt Strtdn
$P2 $RAMS.ZSMSP04 A A A OFF OFF OFF OFF 1 FALSE
2. Obtain the list of virtual disk processes and physical disks associated with $P2:
PUP LISTDEV $P2, ALLVOL