mirrored root disks

[Rich Rossini]

Hi all,
first let me say I am rather inexperienced.I have a k580 with 2 9gb root disks mirrored. They are scsi id's 5 and 6.I removed id 5 to see if the system would boot from id 6. No luck, and produced a quorum error. I assume mkboot was invoked without -lq option. My question is can I rerun mkboot and give -lq option, or do I need to lvreduce and start from scratch? Thanks in advance for any advice.

[Mel Burslan]

were you able to boot your system to issue the mkboot command and where did you boot it from ? scsi id 6 ? cdrom ? tape ?

[Sridhar Bhaskarla]

Hi,

You don't need to start from the scratch.

First of all, put back the mirror disk. Boot the system normally. Once the system is up do

#vgsync vg00

This will sync up the stale extents on the mirror disk. Once it is done, do

#mkboot -a "hpux -lq" /dev/rdsk/c0t6d0

on both the disks

followed by

#lvlnboot -R

Make sure both the disks are appearing with correct boot, root, swap and dump lvols by running "lvlnboot -v". Verify the auto file using the command

#lifcp /dev/rdsk/c0t6d0:AUTO -

on both the disks. It should print 'hpux -lq'.

Repeat your excersize.

-Sri

[Rich Rossini]

Mel,
I put id 5 back in the system and booted from it. system is up, but worried if I lose a disk system will not reboot

[Sridhar Bhaskarla]

Rich,

Without '-lq', automatic boot will fail but if you interact with ISL and issue "hpux -lq", it should boot even without the mirror disk.

-Sri

[Uday_S_Ankolekar]

No need to do lvreduce at all. Just boot the system with primary disk in then do a vgsync /dev/vg00
and recreate boot moot mirror disk

This doc may be good help if you are not sure about how to create a mirror boot disk

http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000073345589

-USA..

[Uday_S_Ankolekar]

I mean bootable mirrored root disk...;-)

[Todd McDaniel_1]

if you used the mkboot -lq command on the both disks... you should be fine.

You always want the box to come up if you have at least one good disk. Then you can fix anything so long as the box boots.

I attach a script to check all the good stuff to make sure you are setup properly. We use this at work for root config.

[Rich Rossini]

Thanks for all the help. Can I do this with the box in production? Any gotchas?

[Patrick Wallek]

Yes, you can do the mkboot command while the machine is running. It should not effect anything.