rootvg사이즈를dynamic하게변경하기

UPDATED: Grow your rootvg on the fly (from 6.1 TL 4)

AnthonyEnglish| Oct 11 2010 | Tags:  volume_group resize rootvg 6.1 7.1 extendlv spare aix 5.3 chvg growth backend disk san lun| Comments (11)  |  Visits (5,543)

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There are lots of good reasons for having spare disk for rootvg, as I looked at in the post make way for rootvg. With virtual disks you can resize your volume group on the fly:
 

Increase rootvg dynamically

If your rootvg “disk” is actually virtual, such as a SAN LUN or a logical volume on the VIO server, then it usually can be expanded on the SAN (or using extendlv on the VIOS) and then recognised on the AIX LPAR using the -g flag of the chvg command:

chvg -g rootvg

 Note: this is supported for rootvg and concurrent vgs from AIX 6.1 TL 4. See IBM technote IZ80021 http://bit.ly/cmHjmy

 Resizing the rootvg disk
 
 I tried to increase rootvg on an LPAR running AIX 5.3 TL 11 and hit the following error:
 

 aix53_lpar # 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.

Looks like the volume group needed to be varied off and varied on again. For rootvg, that means a reboot.

No reboot on AIX 6.1

In AIX 6.1 (from TL 4 - use oslevel -sto check your AIX level), you can increase rootvg on the fly.

 aix61_lpar:/# chvg -g rootvg

 0516-1164 chvg: Volume group rootvg changed.  With given characteristics rootvg can include up to 16 physical volumes with 2032 physical partitions each.

 Sounds like yet another reason to migrate to AIX 6.1.

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