topic Re: vg in lvmtab in Operating System - HP-UX

vg in lvmtab

Vishu — Wed, 17 Jun 2009 19:32:22 GMT

hi,

i have hpux 11.00. i created a test vg named vgtest on server to check some disks. Then, we have been told to remove that vg and pvremove the disk. As i was on leave, so my colleague did that job. what he did,

1. he unmounted the LVs.
2. remove the VG directory from /dev
3. and pvremove the two disk that were in VG.

Now, i can see that vgtest is still in lvmtab file. and when i try to vgexport or vgremove it, it give me an error:-

# vgexport vgtest
vgexport: "/dev/vgtest/group": not a character device.
vgexport: Couldn't export volume group "vgtest".

as it is unable to find its group file, as its directory does not exist. plz help on this.

Re: vg in lvmtab

James R. Ferguson — Wed, 17 Jun 2009 19:46:04 GMT

Hi Vishu:

You colleague failed to follow correct LVM procedures.

Do:

# mv /etc/lvmtab /etc/lvmtab.old
# vgscan -av
# vgchange -a y
# lvlnboot -R

Now, if you have alternate links to any volume groups, you may need to reorder them by doing 'vgreduce' and 'vgextend' to demote primary links to secondary ones and promote secondary links to primary ones, respectively.

Regards!

...JRF...

Re: vg in lvmtab

Mel Burslan — Wed, 17 Jun 2009 19:47:41 GMT

mv /etc/lvmtab /etc/lvmtab.save
vgscan

this should rebuild your lvmtab
in case of a problem you still have a saved copy of lvmtab file.

Hope this helps

Re: vg in lvmtab

Jineesh — Thu, 18 Jun 2009 02:03:10 GMT

Hi Vishnu,

As the above posts say, you need to use vgscan to rescan the volume groups in the server and to update the lvmtab.

Using vgexport to remove the vg from the server will be a good practice.This is the safest way.This will remove the corresponding entries from lvmtab also.

/usr/sbin/vgexport [-m mapfile] [-p] [-v] [-f outfile] vg_name

/usr/sbin/vgexport -m mapfile -s -p -v vg_name

Re: vg in lvmtab

Sajjad Sahir — Thu, 18 Jun 2009 05:24:18 GMT

Dear friend

Please do vgscan as mentioned above
vgscan will Recovering and recreating the /etc/lvmtab file when the file has been deleted or does not match the current physical volumes.
and reporting device special file lists for unconfigured volume groups.

thanks and regards

Sajjad Sahir

Re: vg in lvmtab

Torsten. — Thu, 18 Jun 2009 05:31:45 GMT

>> 2. remove the VG directory from /dev

Deleting device files will not remove the VG entries!

Use "vgremove" next time!

Re: vg in lvmtab

sujit kumar singh — Thu, 18 Jun 2009 06:13:28 GMT

hi

as pvremove has been done vgscan as run with option -av should recreate the /etc/lvmtab afresh without that VG entry.

regards
sujit