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

lvmtab file

Scott Guy_2 — Mon, 09 Aug 2004 09:45:16 GMT

Ok, I recently lost one of my boot disks and just had it replaced. I'm trying to re-establish the mirror with the other disk, but with the disk still being listed in the /etc/lvmtab file, I'm getting nowhere. I can't put the disk back in the volume group, can't mirror logical volumes, etc.

Maybe I'm going about this the wrong way. Any help would be greatly appreciated. BTW, I'm running 11.0

Re: lvmtab file

Pete Randall — Mon, 09 Aug 2004 09:48:42 GMT

Scott,

Try copying the lvmtab file to lvmtab.bak and then re-create it with vgscan -a.

Pete

Re: lvmtab file

Steve Steel — Mon, 09 Aug 2004 09:53:23 GMT

Hi

vgreduce should help

see man page examples

Steve Steel

Re: lvmtab file

Patrick Wallek — Mon, 09 Aug 2004 09:54:05 GMT

The way I usually replace hot-swappable boot disks:

Pull the bad disk
Insert the new disk

# ioscan -fnC disk
to make sure the new disk is available

# vgchange -a y vg00

# vgcfgrestore -n vg00 /dev/dsk/c?t?d0

# vgsync vg00

And that does it.

A good reference for replaceing disks:
HP Software Recovery Handbook - Chapter 16 - LVM
http://www1.itrc.hp.com/service/iv/node.do?node=prodITRC%2FWW_Start%2FN1%7C16%7C11

Look for the section on replacing disks.

Re: lvmtab file

melvyn burnard — Mon, 09 Aug 2004 09:54:08 GMT

have you vgcfgrestored onto the replaced drive?
This should set it up readsy again, then use vgsync to synchronise the mirrors.

Re: lvmtab file

Todd McDaniel_1 — Mon, 09 Aug 2004 09:57:44 GMT

It should have taken the same device name...and recognized it as well. try to ioscan -f and insf -e after a vgscan. Remember to move the old /etc/lvmtab.

Else, pvcreate the disk, then try to add it.
If not, then you may need to remove the mirror then add the disk to the VG then restablish the mirrors.

Re: lvmtab file

Cesare Salvioni — Mon, 09 Aug 2004 10:01:34 GMT

hi

use vgrestore, if you didn't change the default, you should have a backup of vg configuration. The command vgrestore will restore the tables needed by LVM on the new disk

Let's say c0t6d0 is the disk replaced and vg00 is the name of your vg

first
pvcreate -B /dev/rdsk/c6t0d0
mkboot /dev/rdsk/c6t0d0
vgrestore vg00 /dev/dsk/c6t0d0

After this you should have the vg restored.
Try vgdisplay to see if both disks are seen
All you have to do is a vgsync to resync the lv copies

Maybe some commands need raw device instead of block device or viceversa, anyway the command will tell you. Only be sure to use the correct special file !!!

Hope it helps

Re: lvmtab file

Cesare Salvioni — Mon, 09 Aug 2004 10:10:27 GMT

ooppps
vgcfgrestore, not vgrestore

hope this helps

Re: lvmtab file

Scott Guy_2 — Mon, 09 Aug 2004 10:16:07 GMT

Thanks everybody. Everything is back to normal.

Re: lvmtab file

Todd McDaniel_1 — Mon, 09 Aug 2004 10:19:36 GMT

Scott

What did you do?

No points please.