ADSM-L

Re: Recovering an AIX Server to a different server type.

2000-12-06 22:56:46
Subject: Re: Recovering an AIX Server to a different server type.
From: Dan Jennings <dan.jennings AT HOME DOT COM>
Date: Wed, 6 Dec 2000 19:57:13 -0800
What you want to do is called cloning, and is a common thing in AIX,

BUT...
SP's are a little tricky because they have no tape drive attached to the
node itself with which to create a mksysb tape.  I think the most direct
way to do what you want is to mimic what the SP itself does "under the
covers" by building out and using a NIM server. See the NIM manual
for details:
http://www.rs6000.ibm.com/doc_link/en_US/a_doc_lib/aixins/aixnimgd/toc.htm
This tasks takes a lot of disk, so be prepared to dish out a few gigs of
disk to hold the NIM installation resources.

Once this is complete, create the mksysb of your SP node and direct it
to
a disk file.  The mksysb command will moan at you about the image not
being bootable, but the next steps will take care of that. Mksysb man:
http://www.rs6000.ibm.com/doc_link/en_US/a_doc_lib/cmds/aixcmds3/mksysb.htm#A123F120d
So for example, mksysb -iX /var/mksysb.spnode  will create the mksysb
image and store it in a file called /var/mksysb.spnode.

Copy the mksysb image from wherever you stored it on disk over to the
NIM server, register this mksysb file in NIM as an installation source,
make the M80(s) NIM clients, then install to them using the mksysb
image.
It's not as difficult as it sounds, and is in my experience been
successful at cloning SP nodes onto standalones.

If it all works, you will be left with an M80 with an identical rootvg
as your SP node, including all the logical volumes, file systems and
files.

Be careful about the SP-specific stuff that will
also get restored on your M80.  You will want to look carefully at your
/etc/inittab file and the SP /etc/rc.* scripts to make sure you don't
start the HATS, HAGS, HAEM, CSS worm, etc. during the M80 boot.  The
first boot will be ugly, so don't panic if there are a scad of errors
or long time-outs on the first try.

Good luck!

"Poland, Neil" wrote:
>
>         Does anyone know of a Redbook or manual that would cover recovering
> an AIX server to a different server type? We will be migrating SP widenodes
> to rackmounted M80s. All the systems have external SSA excluding the
> rootvgs.
>         My concern is when we attempt to restore the rootvgs. Will we have
> to manually go though and restore some system files while skipping others?
> Our rootvgs hold /, /usr/, /etc/, /tmp/, and /home/.
>
>         We haven't started anything so even suggestions on preventive
> measures would be appreciated!
>
> Thanks in advance for any assistance.
>
> Neil Poland