HP-UX

Do you have a backup of any system or data partitions? Can't see a tape backup device in "ioscan" but maybe you backup across the network?

Did the system crash or for that matter has it had a cold boot for any reason since the failure? Not recommending that you do actually reboot or run "fsck" (because your system may be precarious) but just wondering whether "fsck" has been run by the system already?

Vbe:
1. I can add another disk as soon as it arrives.
2. Please guide me through the steps to make a recovery tape. Or are you suggesting that i make a full backup?

Methyl:
1. There is no backup of any sort.
2. The system didn't crash yet and it has not been rebooted since this failure. and fsck was not run yet.

A recovery tape allows you to boot from the tape to reinstall if needed on a new disk...
Check what you have in /opt/ignite/bin, depending of version you might - or not - have make_recovery. If not what do you have as make_*_recovery ?

And you will have to take also a full backup...

My idea is to have every thing ready in case of failure...
Don't try to reboot your system before, it may not come up...
If the disk is same size, I would go and try include it in the VG, make it bootable and migrate the faulty PV to the new one then remove it from VG00...

Then cross your fingers and test a reboot...
If size bigger then it depends... If I cant assist you (busy week) I hope methyl can...

I think that the guys on ittoolbox.com are giving you the same sort of advice (get an Ignite backup of vg00 , and also get a backup of your data):
http://unix.ittoolbox.com/groups/tec...-of-os-4515267

Running a computer server with no resilient disc system and no backup is not sensible. You need both.

Oracle used to advise against RAID disc systems (notably software RAID) on performance grounds. They also used to made recommendations about the file mapping across multiple discs. A modern hardware RAID system or a SAN is transparent to Oracle.

Just in case you don't have a copy, this unsupported document "When good disks go bad" is a good read. Apart from showing how easy it can be to recover in a resilient system, it also shows the commands to test a disc with "dd".
http://bizsupport2.austin.hp.com/bc/.../c01911837.pdf
HP links can go dead, so do save a copy.

I've seen your error message both from a disc with a tight SCSI cable ... and from a disc which failed totally a few minutes later. You can also get this message (followed by a SCSI reset) if you replug SCSI devices with the power on.