Alternate disk - Mirror

[brian_31]

Currently i just have only c1t2d0 in lvmtab which is my primary. I have added mirror-disk-ux product and would like to mirror c2t2d0 (the alternate boot disk).

Question:

Since all my Apps/Database uses Veritas and are not LVM should i bring down the Apps/DB's to do this mirror?

Thanks

Brian

[James R. Ferguson]

Hi Brian:

LVM mirrored logical volumes can be setup and synchronized without stopping anything.

Chapter-16 of the HP-UX Software Recovery Handbook has an excellent discussion if you are interested.

http://www1.itrc.hp.com/service/iv/node.do?node=prodITRC%2FWW_Start%2FN1%7C16

Regards!

...JRF...

[A. Clay Stephenson]

I suppose by Veritas, you mean VxVM. In any event, your applications and Database are in a completely different volume group (not to mention another volume Manager) so that what you are doing in /dev/vg00 has nothing to do with them. You can do the mirroring completely "on the fly" without bringing anything down. The only "gotcha" is when doing ANY command that references the disk device directly (e.g. /dev/rdsk/c1t2d0) be very careful because one wrong character here could clobber data -- whether or not applications/database are running. Just check those device nodes names twice before hitting the key. The only thing that you need to shutdown for, is the test boot of the alternate. You should also change the boot string to use "-lq" on both the primary and alternate disks because unless you do, you actually make the box less likely to boot without intervention if the alternate disk fails.

[HGN]

Hi

Check the following links this should suffice

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=615897

There are links under this thread

Rgds

HGN