Question & Answer
Question
Is growing a disk (or LUN) in rootvg supported in AIX?
Answer
In AIX if a LUN is grown out on SAN storage, the command "chvg -g vgname" will signal the volume group to check the sizes of disks, and if grown, create more partitions on them. This will allow more useable space in a volume group without extending any new disks into it.
In AIX 5.3 and early 6.1 this is not supported in the rootvg, however. The user will receive an error message:
# chvg -g rootvg
0516-1380 chvg: Re-sizing of the disks is not supported for the rootvg.
0516-732 chvg: Unable to change volume group rootvg.
In AIX V6.1 TL3 and higher (6100-03-00) resizing rootvg disks is now supported.
NOTES:
The chvg manual page is incorrect in some versions of AIX. It refers to these two entries under the "-g" option which are no longer an issue:
2 There is no support for re-sizing while the volume group is
activated in classic or enhanced concurrent mode.
3 There is no support for re-sizing for the rootvg.
This is documented in APAR IZ80021 CHVG MAN PAGE IS INCORRECT FOR -G
and is included in higher versions of AIX.
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Document Information
Modified date:
17 June 2018
UID
isg3T1012509