topic Re: How can I get rid of a disk from lvmtab in Operating System - HP-UX

How can I get rid of a disk from lvmtab

Jash_1 — Fri, 27 Jun 2008 13:32:14 GMT

Hi,

I have had a problem with some disks having their special files change (don't ask), but the lvmtab has a disk registered in it (including 3 alt paths) but the volume group is not there and I want to reuse the disk.
I have tried moving the lvmtab and running:

#vgscan -v

But it put the disk back into the lvmtab.

Has anyone any ideas as to how I can get it out of the lvmtab.

pvcreate -f didn't work.

hpux 11.23

Re: How can I get rid of a disk from lvmtab

James R. Ferguson — Fri, 27 Jun 2008 13:38:21 GMT

Hi Jash:

The easy way is to 'vgexport' the volume group. Then, if you are sure that you want to reuse the physical disk, 'pvcreate' them.

Regards!

...JRF...

Re: How can I get rid of a disk from lvmtab

Jash_1 — Fri, 27 Jun 2008 13:44:22 GMT

The volume group has disappeared, else I would have tried that.

Re: How can I get rid of a disk from lvmtab

Tim Nelson — Fri, 27 Jun 2008 13:51:51 GMT

Try first.

vgreduce -f ( check man page for description

Then if neccessary.

mv /etc/lvmtab /etc/lvmtab.old
then vgscan to rebuild the lvmtab

Re: How can I get rid of a disk from lvmtab

James R. Ferguson — Fri, 27 Jun 2008 13:56:25 GMT

Hi (again):

> The volume group has disappeared

If you are absolutely sure of the physical devices that you want to obliterate, the LVM signitures on them with 'pvremove' (on 11.23 or later) or write zeros as:

# pvremove /dev/rdsk/cXtYdZ

(or)

# dd if=/dev/zero of=/dev/rdsk/cXtYdZ bs=1024k count=10000

Then:

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

Regards!

...JRF...

Re: How can I get rid of a disk from lvmtab

Jash_1 — Fri, 27 Jun 2008 14:03:54 GMT

Looking at the man pages for pvremove, it will not let you remove a disk if it is assigned to a volume group. Sadly the disk is assigned to a volume group within the lvmtab! This means it will not work, I think?

I will check it tho'.

Re: How can I get rid of a disk from lvmtab

Jash_1 — Fri, 27 Jun 2008 14:05:34 GMT

pvremove /dev/rdsk/c20t3d0
pvremove: The physical volume "/dev/rdsk/c20t3d0" belongs to volume group "/dev/vg_dboracle".
pvremove: Couldn't remove physical volume "/dev/rdsk/c20t3d0".

Re: How can I get rid of a disk from lvmtab

Anka — Fri, 27 Jun 2008 14:25:40 GMT

Jash, can you paste the entries for the disk and the VG from the /etc/lvmtab
and also #vgdisplay -v

Re: How can I get rid of a disk from lvmtab

Jash_1 — Fri, 27 Jun 2008 14:29:25 GMT

apgst01 # strings lvmtab
/dev/vg_dboracle
/dev/dsk/c20t3d0
/dev/dsk/c21t3d0
/dev/dsk/c18t3d0
/dev/dsk/c19t3d0

Multi-path san lun.

apgst01 # vgdisplay -v /dev/vg_dboracle
vgdisplay: Volume group not activated.
vgdisplay: Cannot display volume group "/dev/vg_dboracle".

Re: How can I get rid of a disk from lvmtab

Jash_1 — Fri, 27 Jun 2008 14:48:34 GMT

#vgexport vg_dboracle

Problem solved, came to me on a fag break!!

Thanks for all the help.

Re: How can I get rid of a disk from lvmtab

Jash_1 — Fri, 27 Jun 2008 14:51:33 GMT

Cheers guys.