topic Re: Faulty Harddisk Replacement in Operating System - HP-UX

Faulty Harddisk Replacement

Cliff Lim Kok Hwee — Mon, 11 Oct 2004 06:18:28 GMT

Gd Day Forum,

Currently I have a faulty disk inside a volume group vgA (comprising of 3 harddisks).

All the 3 harddisks are configured with logical volumes for raw partitions and is used by the database informix.

The database team will perform data restoration when the faulty harddisk is being replaced.

Query:
- I would like the LV settings to remain the same after the faulty harddisk is being replaced. Can anyone advise on what needs to be done prior the replacement in order to ensure all LV settings are saved and can be restored onto the replaced harddisk.

Thanks n Regards/cliff

Re: Faulty Harddisk Replacement

Slawomir Gora — Mon, 11 Oct 2004 06:21:01 GMT

Hi,

use vgcfgrestore command to restore LVM structure.

Re: Faulty Harddisk Replacement

Ravi_8 — Mon, 11 Oct 2004 06:25:12 GMT

Hi,

Insert the new disk in the same slot of the faulty disk.
#pvcreate -f /dev/rdsk/ (can obtain from ioscan -FnC disk command)
If any lvol's exist in the faulty disk, create the same lvol(s) in the new inserted disk. and restore

Re: Faulty Harddisk Replacement

Robert-Jan Goossens — Mon, 11 Oct 2004 06:28:52 GMT

Hi Cliff,

You can't do anything before changing the disk. The only thing you have to do is to restore the LVM configuration on the new disk.

# vgcfgrestore -n /dev/vgXX /dev/rdsk/cxtydz

and restore the data to the raw partitions.

Best regards,
Robert-Jan

Re: Faulty Harddisk Replacement

Sunil Sharma_1 — Mon, 11 Oct 2004 06:32:03 GMT

Hi,

1. connect new hard disk in same slot
2. run ioscan and see it should be in claimed status
3. run vgcfgrestore command on this disk
#vgcfgrestore -n vgA /dev/dsk/cxtydz

4. vgchange vgA(not must but should be)

you are ready to data restoration.

Sunil

Re: Faulty Harddisk Replacement

Franky_1 — Mon, 11 Oct 2004 06:55:49 GMT

Hi,

run vgcfgrestore -n /dev/vgXX /dev/rdsk/cXtXdX after replacing the HD

The settings are stored by default in /etc/lvmconf/vgXX.conf

Regards

Franky

Re: Faulty Harddisk Replacement

Cliff Lim Kok Hwee — Mon, 11 Oct 2004 20:42:24 GMT

Gd Day Forum,

I will be using the suggested command, vgcfgrestore -n vgA /dev/dsk/cxtydz

Query: The faulty harddisk currently has Logical Volume spanned across to another harddisk. It also have Logical Volume from another harddisk spanned over to it. Since the 3 harddisks belong to the same volume group vgA. Is it a concern when running the vgcfgrestore command?

Thanks n regards/cliff

Re: Faulty Harddisk Replacement

Sridhar Bhaskarla — Mon, 11 Oct 2004 20:54:33 GMT

Hi Cliff,

It is not a concern for running 'vgcfgrestore' command. But note that you probably don't get the data on the logical volumes that share this faulty disk. You can try the following.

1. vgcfgrestore -n vgxx /dev/rdsk/cxtydz
2. vgchange -a y vgxx
3. fsck /dev/vgxx/rlvolx (repeat for all lvols)
3. Try mounting them. If you see data, then you can try copy it but I doubt it.

If you are not able to mount them, then run 'newfs -F vxfs /dev/vg00/rlvolx' to create fresh filesystems and restore the data.

-Sri

Re: Faulty Harddisk Replacement

Cliff Lim Kok Hwee — Mon, 11 Oct 2004 21:35:50 GMT

Hi Sri,

The logical volumes on all the 3 harddisks in vgA are configured as raw partitions for informix database. The db data restoration will be performed after the faulty harddisk is being replaced.

Just want to ensure that the logical volumes configuration configured on the faulty harddisk will be restored using vgcfgrestore command. Regardless of whether LV are spanned onto the faulty harddisk from other harddisk or LV on faulty harddisk are spanned onto other harddisk. (vgA comprises 3 harddisks).
Am I right to say that?

regards/cliff

Re: Faulty Harddisk Replacement

A. Clay Stephenson — Tue, 12 Oct 2004 09:38:27 GMT

Yes that is correct. If you had taken the precaution of mirroring each lvol then you could have replaced the faulty disk "on the fly" without even shutting down the database.

Re: Faulty Harddisk Replacement

Cliff Lim Kok Hwee — Tue, 12 Oct 2004 21:36:24 GMT

Thanks to the All So Talented Forumers.../cliff