AIX 5L Problem Determination - IBM Redbooks

Check the error log with the errpt command in order to see what happened to
the respective disk.
In order to force the volume group to be varied online, use the -f flag of the
importvg command. This makes it possible to operate on the volume group and,
depending on the situation, reconfigure the volume group by excluding the disk
that is marked missing with the reducevg command.
Shared disk environment
In a shared disk environment, such as an SSA disk system, used by two or more
systems, it is possible that the physical volumes defined are not accessible
because they are already imported and varied on by another machine. Check the
volume groups on both machines and compare the PVIDs by using the lspv
command.
7.2.5 Extending the number of max physical partitions
When adding a new disk to a volume group, you may encounter an error due to
there being too few PP descriptors for the required number of PVs. This may
occur when the new disk has a much higher capacity than existing disks in the
volume group.
This situation is typical on older installations, due to the rapid growth of storage
technology. To overcome this, a change of the volume group LVM metadata is
required.
The chvg command is used for this operation using the -t flag and applying a
factor value, as shown in the following example:
# lsvg testvg
VOLUME GROUP: testvg VG IDENTIFIER: 000bc6fd5a177ed0
VG STATE: active PP SIZE: 16 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 542 (8672 megabytes)
MAX LVs: 256 FREE PPs: 42 (672 megabytes)
LVs: 1 USED PPs: 500 (8000 megabytes)
OPEN LVs: 0 QUORUM: 2
TOTAL PVs: 1 VG DESCRIPTORS: 2
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 1 AUTO ON: yes
MAX PPs per PV: 1016 MAX PVs: 32
# chvg -t 2 testvg
0516-1193 chvg: WARNING, once this operation is completed, volume group testvg
cannot be imported into AIX 430 or lower versions. Continue (y/n) ?
y
0516-1164 chvg: Volume group testvg changed. With given characteristics testvg
can include upto 16 physical volumes with 2032 physical partitions
each.
Chapter 7. LVM, file system, and disk problem determination 143