topic Re: Disk mirroring question in Operating System - HP-UX

Disk mirroring question

jfucinos — Mon, 27 Mar 2006 08:02:00 GMT

Hello all,

I have a 10.20 UX workstation. Its disk is about to crash (I can hear screeching noise), so I would like to copy the contents of this disk to another one that I've already installed in this machine. Is this possible? Is there any way to 'clone' the contents on the first disk on the second one, toggle it as bootable, remove the damaged one and keep working as if noting happened?

Any input on this will be appreciated.

Best regards.

Re: Disk mirroring question

Pete Randall — Mon, 27 Mar 2006 08:07:00 GMT

These threads may prove useful:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=825932
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=899594
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=7814

Pete

Re: Disk mirroring question

Antonio Cardoso_1 — Mon, 27 Mar 2006 08:11:31 GMT

Do you have MirrorDisk/UX available ? if so look at this book
http://docs.hp.com/en/B2355-90672/index.html
and other threads regarding mirroring.

Also consider using ignite to perform a tape backup (make_tape_recovery).

Re: Disk mirroring question

Chan 007 — Mon, 27 Mar 2006 08:22:28 GMT

Hi,

Check the following

http://www.dbaoncall.net/references/ht_mirror_boot_dsk.html

Also ensure that you have MirrorUX istalled on it.

Else use ignite

Chan

Re: Disk mirroring question

Steven E. Protter — Mon, 27 Mar 2006 08:34:13 GMT

Shalom,

You can also clone the disk with dd, but without mirror/ux there will likely be a service disruption when the disk fails.

sEP

Re: Disk mirroring question

Robert-Jan Goossens — Mon, 27 Mar 2006 08:38:36 GMT

example for Stevens solution.

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=79940

Regards,
Robert-Jan

Re: Disk mirroring question

jfucinos — Mon, 27 Mar 2006 08:45:02 GMT

Hello,

After taking a look at the procedure on http://www.dbaoncall.net/references/ht_mirror_boot_dsk.html it seems to be fairly simple. However, I don't understand the need of having MirrorUX installed. It's not on my system:

> hostname root:-> swlist -l fileset | grep -i mirror
> hostname root:->

... but all of the commands user on that procedure seem to be available on my system.

Any info about this?

Re: Disk mirroring question

OldSchool — Mon, 27 Mar 2006 10:42:21 GMT

MirrorDisk-UX is an optional package that allows mirroring.

The commands shown on the website are included w/ Logical Volume Manager (LVM) but the "-m" option of the lvextend command probably wont work w/o MirrorDisk. (Don't know, as I've not worked on a system that didn't have both).

Re: Disk mirroring question

Senthil Kumar .A_1 — Mon, 27 Mar 2006 10:53:00 GMT

Hi,

Without MirrorUX product you will not be able to use "-m" option with lvextend.

Best option for your situation is to used the command "dd".

Lets assume the root disk is /dev/dsk/c0t5d0 and the spare disk is /dev/dsk/c0t4d0.

Now execute the following command to copy the root disk entirely..

dd if=/dev/rdsk/c0t5d0 of=/dev/rdsk/c0t4d0 bs=1024000

If the boot disk fails, while you reboot, remove the root disk, change the scsi target of the spare disk to "5" and boot the machine.

Regards,
Senthil Kumar .A