Logical Track Group (LTG) Size of a Volume Group

When an OS migration has been done from a lower version of AIX to AIX 5.3 or higher, the volume group may not have a proper LTG size when extending a volume group with new disk(s). The LTG of the disk may NOT be large enough to add to the existing volume group.

Note to view the current LTG size use lsattr:

#lsattr -El <hdisk#>

Option 1: For volume groups created prior to AIX 5.3 use chvg to change the LTG size:

chvg –L <LTGSize> <vg name>

Where The value of the LTG Size parameter must be less than or equal to
the maximum transfer size of all disks in the volume group. The value of the LTGSize
parameter must be 0, 128, 256, 512, or 1024 in kilobytes

Option 2: For volume groups at AIX 5.3 or higher set the LTGSize of the volume group during varyon.

Valid values for LTGSize include 4K, 8K, 16K, 32K, 64K, 128K, 1M, 2M, 4M, 8M,
16M, 32M, and 128M. If any disk in the volume group is not configured with a max
transfer of LTG Size or greater, the varyonvg will fail.

varyoffvg <vg name>
varyonvg –M <LTGSize> <vg name>