Originally posted by: Matt_Simpson

We're running AIX 6.1. We need to increase the size of disks in a volume group, and have the new space added to the vg (not rootvg, in case that makes a difference). I know about the chvg -g command. Unfortunately, our system is at a level affected by APAR IZ84970, which can cause a system crash when chvg -g is executed.

If we expand the size of the disks on the SAN, and reboot without issuing the chvg command, will the new size be detected and added to the vg at reboot, or is the chvg -g command necessary even with a reboot?
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Originally posted by: SystemAdmin

chvg is the only way. I tried to do this operation with reboot, but with no luck.
This is the copy-paste from redbook "IBM Midrange System Storage Implementation and Best Practices Guide"
With AIX there is no real Dynamic Volume Expansion because after increasing the size of the
logical drive with the DS5000 Storage Manager, in order to use the additional disk space, it is
necessary to modify the volume group containing that drive. A little downtime is required to
perform the operation, which involves the following steps:
1. Stop the application.
2. Unmount all file systems on the intended volume group.
3. Change the characteristics of the volume group with chvg -g vgname.
4. Re-mount file systems.
5. Restart the application.
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Originally posted by: Kosala

why not consider expanding the VG with another volume rather than expanding the existing volume?

Cheers,
Ko
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