How to decrease the size of the Disk

[AIXLogician]

Hello,
I have decreased the lun size on my SAN from 120GB to 100GB, the change was dynamic, I can see this when I run bootinfo -s hdiskX.
But when I run #lsvg XXXvg I still see the disk size as 120GB.

I know I can increase the size of the disk, by just running #chvg -g vgname (this holds good, when you increase the disk size)

What is the command to decrease the size?

Thanks in advance!!!

SARFARAZ AHMED SYED,
Sr. Systems Engineer

 

[normntwrk]

I would just go into smit chfs and reduce the size there

Norm

 

[DukeSSD]

Remove and reconfigure I'm afraid, chvg -g only works if it gets bigger...

 

[markuscj]

Probably easier to allocate another LUN to the VG, migrate and remove the original LUN

 

[AIXLogician]

Thanks you folks. I think I need to do homework of adding another disk and use migratepv command.


Norm,
chfs command will either increase or decrease the filesystem size, but we are talking about physical volume size (and that has to be through chvg command).

SARFARAZ AHMED SYED,
Sr. Systems Engineer

 

[errqiq]

You can also add the disk to the volume group (extendvg) and create mirror of the first disk (mirrorvg), when the copy is finished you can break the mirror by removing the old one (120GB)