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

Disk problem

Otto Folprecht — Wed, 10 Mar 2004 19:40:32 GMT

Need help. One of our disk's died on us so we replaced the disk under warranty. Since the system is hot swap I replaced the disk and tried to mount the disk with mount /u3. The response I got was mount: /u3: I/O error. In sam when trying to access the disk I get the same answer. So what do I have to do to get this disk back online. It's not mirrored or anything to that extent. The disk is solely vg04 on lvolu3 (dev/vg04/lvolu3). THX Otto

Re: Disk problem

Steven E. Protter — Wed, 10 Mar 2004 20:03:39 GMT

slow down.

insf -e

pvcreate the disk.

You may need to boot before any of this works.

After pvcreate you should be able to get it back into a volume groups and synch mirrors if it originally was mirrored.

SEP

Re: Disk problem

Jeff Schussele — Wed, 10 Mar 2004 20:24:02 GMT

Hi Otto,

You need to restore the VG info to it first:

vgcfgrestore -n /dev/vg04 /dev/rdsk/cXtYdZ

This assumes that you ran vgcfgbackup on vg04 - but that happens by default on a lot of vg commands.

Then

vgchange -a y /dev/vg04

to activate it - then mount the *all* the LVs that comprised vg04. At that point IF they mounted OK - you can restore to them from tape.

As Tully stated - slow down - it takes a few steps to get to your destination. Hot-swap doesn't mean spare disk allocation.

Rgds,
Jeff

Re: Disk problem

Patrick Wallek — Wed, 10 Mar 2004 20:26:45 GMT

Even though the disk has been replaced, it has NO volume group structures on it. So you need to get those back first.

# vgcfgrestore -n /dev/vg04 /dev/dsk/c?t?d0

I think the syntax is correct. Check 'man vgcfgrestore' to be sure.

Once that is done, you can do:

# vgchange -a y /dev/vg04
# /u3

Now you will need to restore your data.

Re: Disk problem

Patrick Wallek — Wed, 10 Mar 2004 20:30:57 GMT

You might also want to take a look at the "HP Software Recovery Handbook" located here:

http://www2.itrc.hp.com/service/iv/node.do?node=prodITRC%2FWW_Start%2FN1%7C16

Specifically take a look at Chapter 16 which deals with LVM. There are very good details and instructions on how to replace disks.

Re: Disk problem

Shaikh Imran — Thu, 11 Mar 2004 00:44:03 GMT

Hi,
Please do the following:
Install the device file for the disk by
1) # insf -e
Just get the device file of the disk by
2) # ioscan -fnC disk
say the device file is cXtXdX.
3) #pvcreate -f /dev/rdsk/cXtXdX
4) #vgcfgrestore -n /dev/vg04 /dev/dsk/cXtXdX
5) #vgchange -a y /dev/vg04
6) #mount /u3

By any chance if you are not able to restore the VG configuration by vgcfgrestore then you can create a different vg e.g. vg07 and also change the mount point in the /etc/fstab file.

Now restore the data.

Regards,

Re: Disk problem

Kent Ostby — Thu, 11 Mar 2004 01:40:42 GMT

Otto -- If this disk is a mirrored disk, the vgchange -a y /dev/vg04 may hang for a while.

This is normal as the mirroring is resynced.

If its not a mirror and is a filesystem then you will need to redo the FS structures between steps 5 and 6 of Shaikh's steps above using fsadm or newfs depending on your filesystem type.

Best regards,

Kent M. Ostby

Re: Disk problem

Trond Haugen — Thu, 11 Mar 2004 03:30:36 GMT

HotSwap means you can remove and incert a disk without having to power off the disk cabinet. furhter more HP-UX will hadle this (meaning it will see a device "go" and "come").
BUT data on the disk will only be restored if you have mirroring. So as you don't have that all you will have after swapping is a disk with littery nothing on. (No LVM header, no vg, no lvol, no data.)
Doing a vgcfgrestore will put the LVM information back on the disk. and you will be able to mount it. Then you can restore the data.

Regards,
Trond