topic Re: Extending logical Volume in Operating System - HP-UX

Extending logical Volume

Hanwant Verma_1 — Wed, 19 Oct 2005 11:00:27 GMT

I have a one volume group named /usr2 in HP UX 11.11 whihc is 74% full. How can i extend this volumet group?

Re: Extending logical Volume

Alex Lavrov. — Wed, 19 Oct 2005 11:03:08 GMT

lvextend -L /dev/vgXX/lvolXX

fsadm -b /usr2

to modify FS online, you have OnlineJFS to be installed.

Alex.

Re: Extending logical Volume

Alan Meyer_4 — Wed, 19 Oct 2005 11:06:39 GMT

without OnlineJFS, you'll need to unmount the filesystem to extend it.

Re: Extending logical Volume

Hanwant Verma_1 — Wed, 19 Oct 2005 11:07:18 GMT

Can you tell me the exact process, step by step please.

Re: Extending logical Volume

Alan Meyer_4 — Wed, 19 Oct 2005 11:16:12 GMT

# fuser /usr2

This will give you the processes which are accessing /usr2 and they will need to be shutdown.

Then
# bdf /usr2

Notice the first column which tells you the logical volume information

# umount /usr2

# lvextend -L /dev/vgXX/lvolXX

where /dev/vgXX/lvolXX matches the logical volume information retreived from the bdf.

# fsadm -b /usr2

# mount /dev/vgXX/lvolXX /usr2

Or if /usr2 is in the /etc/fstab file, you can issue a "mountall" command which will then do fsck on the new filesystem and also mount the filesystem with proper switches too.

Re: Extending logical Volume

Alex Lavrov. — Wed, 19 Oct 2005 11:16:42 GMT

Actually I did ....

If you want to do it without OnlineJFS:

lvextend -L /dev/vgXX/lvolXX
umount /usr2
extendfs /dev/vgXX/rlvolXX
mount /usr2

Done.

Re: Extending logical Volume

john kingsley — Wed, 19 Oct 2005 11:17:07 GMT

identify the lvol associated with /usr2:
# bdf | grep usr2

Check to see how much free space there is in usr2's volume group:
# vgdisplay /dev/

extend logical volume:
# lvextend -L /dev//

Find out if you have OnlineJFS:
# swlist -l fileset | grep -i onlinejfs

With OnlineJFS:
# fsadm -b $((*1024)) /usr2

Without OnlineJFS:
- Stop all process accessing /usr2
# umount /usr2
# extendfs /dev//
# mount /usr2

Re: Extending logical Volume

Alan Meyer_4 — Wed, 19 Oct 2005 11:26:56 GMT

oops my fsadm line should be;

extendfs /dev/vgXX/rlvolXX

Re: Extending logical Volume

Hanwant Verma_1 — Wed, 19 Oct 2005 11:32:27 GMT

umount gives me the following error

umount: cannot unmount /usr2 : Device busy

Re: Extending logical Volume

john kingsley — Wed, 19 Oct 2005 11:38:40 GMT

You have to kill all of the process accessing /usr2.

Run:
fuser -cu /usr2

This will give you the list of processes using /usr2.

Re: Extending logical Volume

Helen French — Wed, 19 Oct 2005 11:51:13 GMT

If you have an active Database or files source/user data exists on this file systems, I wouldn't recommend unmounting the FS now. If there is no user interaction on this FS, you can safely unmount it. Also make sure that you are not in that directory (cd /).

I would also suggest having a fresh backup of the file system you are trying to change and make sure you have enough free PEs (vgdisplay -v vg_name) on the volume group. Btw, extending a volume group and logical volume is totally different. I guess you are talking about exteding your LV here.

Re: Extending logical Volume

Hanwant Verma_1 — Wed, 19 Oct 2005 11:53:08 GMT

Can i restart the server in sigle user mode and then follow the process, to be at safer side?

Re: Extending logical Volume

john kingsley — Wed, 19 Oct 2005 12:02:15 GMT

If you have a lot of process running that use this filesystem, it would be a good idea to restart you system into single user mode to do this. That way, you're guarantee that everything comes down cleanly. In single user, your paths may not be set correctly, so you may have to run /sbin/extendfs

Re: Extending logical Volume

Alan Meyer_4 — Wed, 19 Oct 2005 12:02:58 GMT

single user is always safer for these things...

Re: Extending logical Volume

Helen French — Wed, 19 Oct 2005 12:03:08 GMT

If you can reboot the server without any user interruptions, I would say that's the safe case. Once rebooted, you can mount the root volumes (mount -a) from vg00 and then try running the LV extend commands.

Re: Extending logical Volume

Hanwant Verma_1 — Wed, 19 Oct 2005 16:21:49 GMT

Thanks everyone, i have extended the volume group in single user mode successfully.