Steps to replace mirrored disk - HPUX

[Samshen]

Hi all,
I have a disk that contains 10 logical volumes witch are mirrored and two witch are not mirrored. There are many "error reading from the disk" events from this disk, logged in the system. I have decided to replace this disk, to prevent any possible data failure.
I would appreciate if somebody tell me the steps to perform to replace this disk, as it contains both mirrored and non-mirrored LV.

Thank you.

[Patrick Wallek · Accepted solution]

If this is not a boot disk, then replacement is fairly easy:

1) put in the new disk
2) run a vgcfgrestore to restore the VG configuration
3) reactivate the VG (vgchange -a y vg??)
4) vgsync to resynchronize your mirrored LV's
5) Restore the data from your non-mirrored LVs.

If you replace a disk that has non-mirrored LV's then you WILL have data loss unless you run a backup before the replacement or move the data to a different disk.

[Steven E. Protter]

Shalom,

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

SEP

[Torsten.]

The procedure is very different for boot disks on Integrity or PA-RISC systems.

Make sure you read and understand the document provided by Steven.

In case this is a data volume and your patch level is current, make sure you are using the

pvchange -a n /dev/dsk/...

command to prevent any LVM access to the disk before you pull out the culprit.

[perumal_2]

Hi Samshen

Mirroed boot disk and Mirrored data disk procedure varies greatly only in the LIF preperation in he concerned disk.
The common procedure between these two are
1. reduce the lv from mirror using lvreduce -m 0 /dev/vgxx/lvxx /dev/dsk/cxtxdx (fault pv name)
2. reduce the vg from the pv
vgreduce /dev/vgxx /dev/dsk/cxtxdx (faulty pv name)
Before diong this take a vgcfg backup.
There is detaield document on this in docs.hp.com at
http://www.docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

TQ
Perumal

[Samshen]

Thank you all for your help.