topic Re: remove VG in Operating System - HP-UX

remove VG

kholikt — Sun, 08 Jan 2006 21:16:09 GMT

Hi,

I need to remove one of the vg that is no longer in use. I have deleted all the LV. should I just vgremove /dev/myvg? Do I need to do a vgscan -v to update my lvmtab again.

I need to release the pv in /dev/myvg and use it to extend other vg. Should I do pvremove first and pvcreate again before I can do vgextend to the other vg?

Re: remove VG

Joseph Loo — Sun, 08 Jan 2006 21:22:54 GMT

hi,

no need to vgscan but u may confirm it by referring to /etc/lvmtab if the vg is still there:

# strings /etc/lvmtab

perform "pvcreate -f" on the pv u like to vgextend. this will delete any file system still present.

regards.

Re: remove VG

Denver Osborn — Sun, 08 Jan 2006 21:32:00 GMT

To remove the VG you need to remove the lvols, then remove all but one of the physical volumes from the vg using vgreduce. After there are no lvols and one pv left in the vg, you can do vgremove to remove the vg from the system.

You could then pvcreate the freed up pv's and use vgextend to add them to other volume groups.

You shouldn't need to run vgscan.

to sum it up...

lvremove
vgreduce
vgremove
pvcreate
vgextend

Hope this helps,
-denver

Re: remove VG

njia_1 — Sun, 08 Jan 2006 21:38:36 GMT

Hi

I always do a pvremove first before I use it again for another vg. Because if I see an error message I know it is being used by another vg. So I do not need to remember and double check if I pick up the correct one.

Do a pvremove and create new pv using pvcreate without -f option. That is my advice.

pvcreate -f works just fine.

thanks

Re: remove VG

Sivakumar TS — Sun, 08 Jan 2006 21:48:53 GMT

Hi Kholikt,

You can just do

#vgexport

to remove all reference to that vg from the system, including dev files.

Latter you can do

#pvcreate -f < the disks> , to the disks which are part of this vg now, to use for another vg.

With Regards,

Siva.

Re: remove VG

Rick Garland — Sun, 08 Jan 2006 23:18:48 GMT

vgexport will remove the references to the VG.
After you remove the LVs with the lvremove command, you can use the vgexport command.

This will remove the /dev/, remove the reference in the lvmtab, no need to vgscan.

Re: remove VG

melvyn burnard — Mon, 09 Jan 2006 00:45:38 GMT

If you really no longer wish to use it, just vgexport the vg

Re: remove VG

so_2 — Mon, 09 Jan 2006 06:22:57 GMT

you have to use vgreduce command to bring the volume group holding only one PV in it.
you could youse multiple PV arguments with vgreduse command for this.

you have to reduce alternate links also if any.

One you come to a position were only one PV is presrent in the VG , you could remove the VG using vgreomve command.

The best and recomended method for removing a vg is using a vgexport command which will remove all the entries about VG and PVs belonging to that VG from /etc/lvmtab.

shinoj

Re: remove VG

Devender Khatana — Mon, 09 Jan 2006 06:36:42 GMT

Hi,

You can remove vg through both methods. First is vgreduce and other is vgexport ? The second one is more appropriate and will require very less efforts.

In case of first you require to reduce VG to only one disk and this is applicable even if you have more than one link for one disk. But in the second case all the disks will be released even if your VG have 10 disks with 4 links each.

After removing the VG by either method you need to pvcreate it using -f option. This is requires as the charaterstics of the VG to which the disk/disks are being added now could be different.

Also do assign points to the responses to your threads. Your unassigned threads are listed here

http://forums1.itrc.hp.com/service/forums/pageList.do?userId=CA610806&listType=unassigned&forumId=1

HTH,
Devender