topic Re: Change root (filesystem) device in Operating System - HP-UX

Change root (filesystem) device

Linoge — Tue, 12 Dec 2006 08:17:58 GMT

Hello to all!

I have a some strange problem. I setup hp-ux 11.23 (06.06 relise) on rx6600, boot from SAN (EMC CX300), direct connect (no SAN switch). Then I simple add SAN switch in this config:

[EMC]---[SAN-switch]---[rx6600]

There are no other devices connect to switch or EMC. rx6600 still can see LUN and can start boot, but after kernel loading I saw a message like "no swap, no root fs" and system crash. I saw somthing like that in Linux when root fs (hda,hdb,hdc) were changed and system can't normal boot.

How can I resolve this problem?

Re: Change root (filesystem) device

Coolmar — Tue, 12 Dec 2006 10:00:32 GMT

Looks like when you added the switch, the boot device path changed. So now when it boots it doesn't know where to look.
When the system is booting, stop the boot process and at the boot prompt type "SEA" to search for the boot disk. Then boot :

bo p0 (might be p1 or p2)

Are you able to boot?

Re: Change root (filesystem) device

Steven E. Protter — Tue, 12 Dec 2006 10:49:09 GMT

Shalom,

This simply may not be supported.

The best administrators do not like to boot off SAN because if the SAN is gone you have no functionaltiy nor the ability to do even basic diagnostics.

That being, said it probably is supported, but you need to make sure your system firmware is up to date and the EMC is properly configured.

I have seen reports of unreliability when trying to boot rx class boxes of EMC and strongly advise against it.

SEP

Re: Change root (filesystem) device

Linoge — Wed, 13 Dec 2006 00:25:42 GMT

Thanks for you reply! I'm trying to change boot path.

I know that SAN boot is not a good solutions, but in this case I didn't have a choose.