topic Re: Disk Failure in Operating System - HP-UX

Disk Failure

Bona_1 — Sun, 04 Jan 2004 04:41:48 GMT

Hello All,
I have an RP 7410 with a failed mirror disk. I want to replace the failed disk, and I want to know if there are any commands i need to type before I replace the disk? The way i see it, since the disk is failed, I don't need to unmount the file systems anyway, all i need to do is switch the disk, restore (vgcfgrestore) and re-sync. Please advice.

Re: Disk Failure

Rajeev Shukla — Sun, 04 Jan 2004 05:26:00 GMT

Yes, since the LV's on the disks are already mirrored, there is no need to unmount any filesystems as the system would still be running.
Just replace the disk with a new one, do a vgcfgrestore on the new disk, that should re-sync all mirrors and if not do a vgsync

Re: Disk Failure

PVR — Sun, 04 Jan 2004 06:03:47 GMT

Hi

Replace the disk. No need to unmount filesystems
Do #pvcreate /dev/rdsk/cXtXdX

#vgcfgrestore vgname /dev/dsk/cXtXdX
#vgsync /dev/vgname

Re: Disk Failure

Hazem Mahmoud_3 — Sun, 04 Jan 2004 08:58:36 GMT

So I have a question, how do you know which vgname to use with vgcfgrestore and vgsync since there can be several vg's on a physical volume? Do you do it for all vg's that exist on that disk? Thanks!

-Hazem

Re: Disk Failure

Mourad Derriche — Sun, 04 Jan 2004 11:36:20 GMT

Hi

Yes, you would definately have to issue vgsync for each volume group that it is associated with.

The procedure is as follows.

pvcreate /dev/rdsk/
vgcfgrestore /dev/ /dev/rdsk/
vgsync /dev/

Issue vgsync for each volumegroup the disk is a member of.

Remember that if the disk is a bootdevice you will need to add '-B' to pvcreate, and reapply the LIF area.

Re: Disk Failure

Rajeev Shukla — Sun, 04 Jan 2004 17:30:31 GMT

Hi Friends,
Let me correct you, a disk can belong to only one VG, so how can you say there can be many VG assocaited with a particular PV?
And by the way you can even re-activate the VG and that will start the VG syncing.