topic Re: extend Virtual Disk on HPUX in Disk Enclosures

extend Virtual Disk on HPUX

Ancelmo Rodriguez Parra — Wed, 04 Feb 2009 19:27:41 GMT

We have EVA4400 presentting virtual disks to a server running HP-UX itanium B.11.23 U ia64.
Is it possible to extend a virtual disk already used on the HP-UX system?

Re: extend Virtual Disk on HPUX

Víctor Cespón — Wed, 04 Feb 2009 22:17:37 GMT

Check the pvchange command

http://docs.hp.com/en/B9106-90008/pvchange.1M.html

Allow the allocation of additional physical extents to a physical volume:

pvchange -x y /dev/dsk/c0t0d0

Re: extend Virtual Disk on HPUX

Ancelmo Rodriguez Parra — Thu, 05 Feb 2009 02:10:26 GMT

works, now the system sees the modified size (20G), but the logical volume still sees the original(10G). Trying to extend the logical volume is not possible because still sees the 10GB disk

Re: extend Virtual Disk on HPUX

Hoang Chi Cong_1 — Thu, 05 Feb 2009 05:51:22 GMT

Hi,

That's correct!

Although the OS can see new new disk's size, you still can not extend the Logical Volume.
With EVA, if you want to extend a VG, there are two ways:
1. Create more new Vdisk, then extend it to the VA.
2. Resize the Vdisk.

But in both case, the OS can not automatic extend when you extend the LV.
In this case, you have re-create the LV.
Then you can use the new size (20GB).
You have to backup all data and after re-create the LV, just restore.

In another way, if you don't want to re-create the LV, just create one more Vdisk with 10GB then add to the VG, then you can extend the current LV to the new disk.

Hope this helps,
Cong,

Re: extend Virtual Disk on HPUX

Armin Kunaschik — Thu, 05 Feb 2009 12:42:54 GMT

If your HP-UX 11.23 patchlevel is current you should have the command vgmodify available.
But the increase is only possible if the volume group is offline.
Do "vgchange -a n" and "vgmodify" to get the new extents into the LVM configuration.

My 2 cents,
Armin

PS: Assign points if you find answers useful!

Re: extend Virtual Disk on HPUX

Avinash20 — Thu, 05 Feb 2009 18:11:46 GMT

Yes, it possible to extend the VG and then you need to extend the LV manually

Please refer to the below doc

http://docs.hp.com/en/vgmodify/vgmodify_wp_modified_final.pdf

Re: extend Virtual Disk on HPUX

Ancelmo Rodriguez Parra — Thu, 05 Feb 2009 20:22:17 GMT

"vgchange -a n" works, but:
# vgmodify
sh: vgmodify: not found.

Re: extend Virtual Disk on HPUX

Armin Kunaschik — Fri, 06 Feb 2009 09:50:53 GMT

Please read the mentioned document. You'll find that you need to install PHCO_35524.
Your HP-UX system seems to run with a pretty old patchlevel. You should urgently consider installing a current patchelevel!

Armin

PS: Assign points if you find answers useful!

Re: extend Virtual Disk on HPUX

Ancelmo Rodriguez Parra — Fri, 06 Feb 2009 18:08:25 GMT

I am installing the last patch level