topic Re: Change the Max PE for PV in Operating System - HP-UX

Change the Max PE for PV

Qcheck — Wed, 17 Sep 2008 18:13:03 GMT

How can I change Max PE for pv in HPUX? I tried to do this with vgmodify. Then it errored that the volume group named vgas is active.

So after unmounting the file systems, how come I can't deactivate the volume group? This is data volume group which is on SAN.

Thanks in advance.

Re: Change the Max PE for PV

James R. Ferguson — Wed, 17 Sep 2008 18:21:54 GMT

Hi:

Unmounting the filesystems in the volume group is just the first step to deactivating the volume group. You need to do:

# vgchange -a n /dev/vgNN

...then proceed with your 'vgmodify'. To reactivate the volume group, do:

# vgchange -a y /dev/vgNN

Regards!

...JRF...

Re: Change the Max PE for PV

Tim Nelson — Wed, 17 Sep 2008 18:29:00 GMT

I assume you are reading all the instructions in the vgmodify man page, you may still have more steps to move the first extent to make room for the new map info then renumbering the extents.

Hope you have a fresh backup in case something fails.

Re: Change the Max PE for PV

Qcheck — Wed, 17 Sep 2008 18:35:44 GMT

Thank you James. Now I can deactivate. But when I tried to modify like following:

vgmodify -e 16500 -n /dev/vgas, I got the following:

Vgmodify: This operation can only be completed if PE number zero on /dev/rdsk/c13t0d1" is free.

Re: Change the Max PE for PV

Torsten. — Wed, 17 Sep 2008 18:37:22 GMT

You need to run 11.23 to do this.

A new version (I don't remember details at the moment) can do this online. Have to check this ...

With 11.31 you may consider to use LVM version 2.0 or version 2.1 - this works different ...

Re: Change the Max PE for PV

James R. Ferguson — Wed, 17 Sep 2008 18:46:24 GMT

Hi (again):

> Vgmodify: This operation can only be completed if PE number zero on /dev/rdsk/c13t0d1" is free.

You need to use 'pvmove' to free the first extent. See:

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01920387/c01920387.pdf (BSC link updated by admin)

Regards!

...JRF...

Re: Change the Max PE for PV

Steven E. Protter — Wed, 17 Sep 2008 19:29:11 GMT

Shalom,

This is set on the volume group level.

It can not be changed except in HP-UX 11.31

You need on other versions of the OS to vgexport the volume group and recreate the volume group with less physical volumes -p or -s parameter.

SEP

Re: Change the Max PE for PV

Patrick Wallek — Wed, 17 Sep 2008 19:30:09 GMT

SEP,

Actually that isn't true. The vgchange command is available in HP-UX 11.23.

Re: Change the Max PE for PV

Tim Nelson — Wed, 17 Sep 2008 19:41:19 GMT

vgmodify was introduced into 11.23 around Feb 2007 with patch PHCO_35524

Re: Change the Max PE for PV

Qcheck — Wed, 17 Sep 2008 20:13:12 GMT

I did pvmove and vgmodify. Everything worked that Max PE changed as what I wanted, except after mounting the file systems, I lost data(don't worry only test server, thats the reason I was testing).

what is the command to restore? I have the backup on ignite server. The server I am working is ignite client.... :-(

Re: Change the Max PE for PV

Qcheck — Wed, 17 Sep 2008 22:56:26 GMT

Sorry, after vgmodify, I couldn't mount the filesystems. Am I missing any other step prior to mount the file systems?

Re: Change the Max PE for PV

James R. Ferguson — Wed, 17 Sep 2008 22:58:27 GMT

Hi (again):

> Sorry, after vgmodify, I couldn't mount the filesystems. Am I missing any other step prior to mount the file systems?

Did you do (?):

# vgchange -a y /dev/vgNN

Regards!

...JRF...

Re: Change the Max PE for PV

Qcheck — Wed, 17 Sep 2008 23:10:35 GMT

Sorry James, Got me....my bad, I thought I did, but apparently not when I checked now, thats the reason I couldn't mount. So stupid.

I think time to go home. I am working on too many things at the same(moving apps to prod) and working from morning 7:30am EST.

I appreciate your time James..

Thanks again everyone..

Re: Change the Max PE for PV

HCL123 — Thu, 18 Sep 2008 05:09:26 GMT

Pratibha

Umounting the filesystems in the volume group is just the first step to deactivating the volume group. You need to do:

# vgchange -a n /dev/vgNN
then use vgextend and modify vg

# vgchange -a y /dev/vgNN

Regards

shelendra shukla

Re: Change the Max PE for PV

Torsten. — Thu, 18 Sep 2008 05:18:15 GMT

What hp-ux release are you using?

New for 11.31 september release:

The vgmodify command supports LUN expansion on a Version 1.0 volume group **without** deactivating the volume group.

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01941067/c01941067.pdf (BSC link updated by admin)

Re: Change the Max PE for PV

Qcheck — Thu, 18 Sep 2008 10:52:37 GMT

Torsten, I am running 11.23 version

Re: Change the Max PE for PV

James R. Ferguson — Thu, 18 Sep 2008 11:11:47 GMT

Hi:

> Shelendra: Umounting the filesystems in the volume group is just the first step to deactivating the volume group. You need to do:

COPYING, VERBATIM my opening comment a DAY LATER IS BLATANT PLAGARISM. You added nothing to this thread other than a clear attempt to garner points for yourself.

Pratibha, it is always helpful (and wise) to specify your OS release in posts of this nature. It was clear to me that you were running either 11.31 or 11.23 with the 'vgmodify' patch, but adding the release level would have been very useful, particularly in light of Torsten's last pointer for 11.31.

...JRF...

Re: Change the Max PE for PV

Qcheck — Thu, 18 Sep 2008 16:55:46 GMT

I know, I should have mentioned the version. However everything worked. Thanks James.