topic Re: replace disk in Operating System - HP-UX

replace disk

A.G.M. Velthof — Mon, 01 Sep 2008 12:50:32 GMT

Hello,

On one of our systems it appears 2 disks are defect. It is a rx 2620 server with 11.23 HPUX
First disk is the mirror of boot disk and the second one is a non boot disk and one of a group of 4 disks in a volume group. mirrored and pvgroup.

Both disks are not seen anymore in an ioscan.

Where can I find the exact steps to replace the disks and make sure no data is lost?

Thanks, Alfons

Re: replace disk

Ivan Krastev — Mon, 01 Sep 2008 12:57:55 GMT

See this document - http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

regards,
ivan

Re: replace disk

James R. Ferguson — Mon, 01 Sep 2008 13:19:51 GMT

Hi:

It seems unlikely that *two* disks have actually failed. Check your cabling and your disk controllers in 'ioscan'.

Regards!

...JRF...

Re: replace disk

A.G.M. Velthof — Mon, 01 Sep 2008 13:27:53 GMT

Hello,

It is a system in another country where the administrator is on vacation.
This morning the machine acted real strange, so I took a look at it.
The non root disk crashed this morning (Oracle Instance running on it)
Looking at the output of ioscan I only did see one root disk. In the syslog I could see that the problem with the root disk started on 17 june.
The disks do have different controlers.

Thanks, Alfons

Re: replace disk

Deepak Kr — Mon, 01 Sep 2008 13:37:59 GMT

You can replace boot mirror disk using the doc already mentioned above.

Can you provide following info here. We can help you to make out steps for you then.

#vgdisplay vg00
#vgdisplay -v vg00
#ioscan -fnC disk

#ll -rt /dev/*/group

and vgdisplay -v for another VG.

Re: replace disk

Deepak Kr — Mon, 01 Sep 2008 13:41:35 GMT

Also log a case with local hp support centre for replacing disks.

So that you can minimize the risk of running system on single disk.

Do you have ignite backup on tape using make_tape_recovery?

Re: replace disk

Deepak Kr — Mon, 01 Sep 2008 14:08:24 GMT

FYI. I have attached a series of steps for guidline.

You can try making as per the details you have.

Re: replace disk

SKR_1 — Mon, 01 Sep 2008 14:42:36 GMT

You need to contact for HP support, it may be some other issue. Two disks cant be defective at sametime.

Thanks

SKR

Re: replace disk

Patrick Wallek — Mon, 01 Sep 2008 15:15:06 GMT

>>You need to contact for HP support, it may
>>be some other issue.

Agreed. If you have a support contract you should definitely log a call so HP can analyze and get you the parts, disks or whatever, that you need.

>>Two disks cant be defective at sametime.

That is absolutely NOT true. While the chances are low for 2 to be defective at the same time it is absolutely possible.

If you read one of the responses you will notice that it was said that one shows defective as of June 17. So if the other one failed recently that is essentially a span of 2.5 months between failures, which changes the odds considerably.

Re: replace disk

A.G.M. Velthof — Tue, 02 Sep 2008 06:30:34 GMT

Here is the output You asked for. I've put them together in a tar.

Regards, Alfons

Re: replace disk

Torsten. — Tue, 02 Sep 2008 06:44:13 GMT

Both disks are not visible in ioscan, because of the last reboot.

/dev/dsk/c2t1d0s2

/dev/dsk/c4t2d0

Both are likely dead and need replacement.

Both VGs are likely mirrored, so you need to replace the disks and sync the mirror.

See the well known document for the steps:

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

Re: replace disk

A.G.M. Velthof — Wed, 03 Sep 2008 09:07:58 GMT

Hello,

I succeeded to replace the mirrored boot disk and make it all working again thanks to everybody.
The other disk however is part of a volumegroup of 4 disks. Mirrored and striped over 2 disks.

Is it something like:
ioscan
insf -C disk
vgcfgrestore -n /dev/vgora /dev/rdsk/c4t2d0
vgchange -a y /dev/vgora

or am I forgetting something.

Thanks, Alfons

Re: replace disk

Torsten. — Wed, 03 Sep 2008 09:10:57 GMT

Yes, you forgot "pvchange -a ..." if your system supports this, see again

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

Re: replace disk

A.G.M. Velthof — Wed, 03 Sep 2008 10:11:51 GMT

Everything works fine again.

Thanks to all

Alfons