AIX Version 4.3 Differences Guide

ACTIVE PVs: 1 AUTO ON: yes
MAX PPs per PV: 2032 MAX PVs: 16
Note
When using the -t flag with chvg and mkvg, it must be entered from the command
line.
5.5 Physical Partition Support (4.3.1)
The support for physical partition sizes of 512 MB and 1024 MB have been added
to AIX 4.3.1. Volume groups created with this new size cannot be imported into
previous versions of AIX.
In pre-AIX 4.3.1 versions, if you add a new volume group, the physical partition
sizes in megabytes you are allowed to chose are: 1, 2, 4, 8, 16, 32, 64, 128, and
256.
For AIX 4.3.1, and later releases, if you add a new volume group, the physical
partition sizes in megabytes you are allowed to chose are: 1, 2, 4, 8, 16, 32, 64,
128, 256, 512, and 1024 MBs.
If you select a physical partition size of 512 or 1024 MBs on a AIX 4.3.1 or later
system, the volume group created cannot be imported on older versions of AIX.
5.6 Big Volume Groups (4.3.2)
Table 20. Limitations of LVM
A new volume group (VG) format is added in AIX 4.3.2, which increases the
maximum number of disks that can be included in a volume group from 32 to 128.
The maximum number of logical volumes in this new volume group format is
increased from 256 to 512. This means:
• The maximum physical volume (PV) number in one volume group is increased
from 32 to 128 (1024 in the future)
• The maximum logical volume (LV) number in one volume group is increased
from 256 to 512 (1024 in the future)
Table 20 provides information about LVM restrictions in several AIX versions.
Version
Volume
group
(per system)
Physical volume
(per volume
group)
Physical partition
(per physical
volume)
Logical volume
(per volume
group)
Logical partition
(per logical
partition)
AIX
4.3.2
AIX
4.3.1
AIX
4.3.0
255 128 1016*-t factor 512 32,512
255 32 1016*-t factor 256 32,512
255 32 1016*-t factor 256 32,512
AIX 4.2 255 32 1016 256 32,512
Logical Volume Manager Enhancements 87