topic Re: Replacing a failed boot disk in mirror in Operating System - HP-UX

Replacing a failed boot disk in mirror

Ali Imran Abbas — Thu, 22 May 2008 16:04:04 GMT

We have a mirror setup for boot disk hosting vg00 and one of the disk in the mirror is having problems. Some times it becomes unavailable and you have to pull it out and then plug it in and then it starts working. So we have decided to replace it. I need a proceedure to replace it. Can any one please send me the stepwise proceedure with commands to do this thing.

Re: Replacing a failed boot disk in mirror

James R. Ferguson — Thu, 22 May 2008 16:08:40 GMT

Hi:

See :

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

Regards!

...JRF...

Re: Replacing a failed boot disk in mirror

Steven E. Protter — Thu, 22 May 2008 16:09:25 GMT

Shalom,

If you catch it fast enough, you merely pull the bad disk and replace it.

The mirrors will then rebuild.

If the second disk is totally dead, you will have to re-mirror after doing the following steps.

vgreduce -f vg00
# follow post command instructions.

SEP

Re: Replacing a failed boot disk in mirror

Ali Imran Abbas — Thu, 22 May 2008 16:18:58 GMT

The bad disk is still working and showing its status as available in vgdisplay -v command.

Do I need to give some commands before taking the disk out or simply pulling it out will wrk well. After replacing the disk do I need to give some commands as vgcfgrestore?

Pls give me steps and commands to perform this operation.

Re: Replacing a failed boot disk in mirror

john D_3 — Thu, 22 May 2008 18:41:53 GMT

If it is a PA RISC server:

lvreduce -m 0 /dev/vg00/lvol1 /dev/dsk/cxtxdx

vgreduce vg00 /dev/dsk/cxtxdx

Replace the disk and then do:

ioscan -fnC disk

pvcreate -B /dev/rdsk/cxtxdx

vgextend vg00 /dev/dsk/cxtxdx
mkboot -l /dev/rdsk/cxtxdx
mkboot -a "hpux -lq" /dev/rdsk/cxtxdx

lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/cxtxdx

lvlnboot â Rv vg00

vgdisplay -v vg00

Re: Replacing a failed boot disk in mirror

john D_3 — Thu, 22 May 2008 18:43:24 GMT

Correction
If it is a PA RISC server:

lvreduce -m 0 /dev/vg00/lvol1 /dev/dsk/cxtxdx - remove all lovls

vgreduce vg00 /dev/dsk/cxtxdx

Replace the disk and then do:

ioscan -fnC disk

pvcreate -B /dev/rdsk/cxtxdx

vgextend vg00 /dev/dsk/cxtxdx
mkboot -l /dev/rdsk/cxtxdx
mkboot -a "hpux -lq" /dev/rdsk/cxtxdx

lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/cxtxdx - add all lvols

lvlnboot Ã¢Â Â Rv vg00

vgdisplay -v vg00

Re: Replacing a failed boot disk in mirror

Torsten. — Thu, 22 May 2008 19:01:21 GMT

It all depends ...

Is it a HP9000 or Integrity?
Is it based on FC, SCSI or SAS?

Run and post results:

# model
# ioscan -fn
# strings /etc/lvmtab
# vgdisplay -v vg00

What is the disk in question?

Re: Replacing a failed boot disk in mirror

James R. Ferguson — Thu, 22 May 2008 19:09:25 GMT

Hi (again):

Haste makes waste. The document (link) I suggested that you read is worth reading *before* you begin. You haven't provided many details.

Regards!

...JRF...