From: Jeff Cleverley (jeffc@ftc.agilent.com)
Date: Tue Jan 04 2005 - 20:06:52 EST
Greetings,
I only received one reply which was from Anil Rajapure, who reminded me
of booting from the alternate kernel.
We were aware of this option, but it failed on a server someone tried a
week before, so we were not wanting to rely on this.
What we ended up doing was pulling one disk from the root disk mirror
before doing the patching. Once the patching was complete and the
reboot done, we plugged the drive back in and did the vgchange and
vgsync commands. The only odd effect of all this was a diskinfo of the
disk that had been pulled showed io_search failure messages. An ioscan
-fnCdisk cleared up the problem.
The original post is below.
Thanks,
Jeff
> We are going to be patching some critical servers
> tomorrow. The patches
> have been tested on lesser systems with no problems,
> but they also don't
> have all the apps/drivers the servers do such as
> fibre channel, gigE,
> OnLine JFS, etc.
>
> We do have make_net_recovery images, but we know
> these will take at
> least an hour to run, and we have 6 servers to do.
> We have the root
> disks mirrored and all systems are running 11.00.
> We came up with a
> couple of possible quick failovers, but we are not
> sure about a couple
> of things.
>
> 1. Pull the alternate path disk that houses half of
> the mirror before
> patching. If the patching doesn't work, reboot from
> the alternate path
> disk and then add the primary path disk in. The
> disks are set to boot
> without quorum. The question is will the primary
> path disk sync to the
> alternate path disk or will the alternate try and
> sync to the primary?
>
> 2. Do an lvsplit of lvols 1,2, and 3 and re-sync if
> all goes well. The
> problem with this is how would you boot and will
> hpux boot with logical
> volumes lvol1b, lvol2b, and lvol3b. It looks like I
> could do something
> like "ISL > hpux /dev/dsk/c3t5d0 (;1) /stand/vmunix
> since lvol1 would be
> the first partion on the disk.
>
> If we have to use the make_net_recovery we will, but
> we're hoping to
> minimize the downtime for the users.
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