topic Re: Replacing boot disks in Operating System - HP-UX

Replacing boot disks

Yvonne Butler — Mon, 15 Sep 2008 07:54:28 GMT

I need to replace the boot disks of an N-class server from 36GB disks to 72GB disks. The process I was going to use to achieve boot disk replacement was this:

1. Take full vg00 ignite backup
2. Shutdown server, remove both old disks, insert both new bigger disks
3. Recover vg00 ignite backup
4. Setup alternate boot disk to with LIF and mirror to primary boot disk

Is there anything else that's needed in this process to achieve the same vg00 setup on the new bigger disks?

Re: Replacing boot disks

Steven E. Protter — Mon, 15 Sep 2008 09:00:47 GMT

Shalom

Steps 1-3 are fine.

You can manually intervene in the Ignite process and set up vg00 to utilize increased space if you wish.

Then do step 4.

Ignite make_tape_recovery will back up and restore mirror boot disk configuration as well.

SEP

Re: Replacing boot disks

Vishu — Mon, 15 Sep 2008 12:42:01 GMT

Appreciated....
do exactly what you wrote...but like Steve said, intervene during recovery process to utilize your full disk space.

Rgds
Vishu

Re: Replacing boot disks

Tim Nelson — Mon, 15 Sep 2008 13:10:35 GMT

If you do not need to change the sizes of any vg00 vols you can replace the disk on the fly.

reduce the mirror, replace the disk with bigger disk, re-add the bigger disk to vg00, follow the root vol mirroring procedure.

When done repeat the process for the other disk.

Re: Replacing boot disks

Yvonne Butler — Mon, 15 Sep 2008 13:35:54 GMT

Tim,

Really? I didn't think this process you mention would allow me to fully utilise the bigger disk. I was always under the impression that a volume group has to be created with the biggest disk first, if you therefore add a larger disk later on it will only recognise the initial disk size, the rest will be ignored. Or am I wrong?

Re: Replacing boot disks

kuldeep saroha — Mon, 15 Sep 2008 20:39:22 GMT

You can utilize the full space of hard disk by using the Tim suggested procedure. but you can not increase the size of root volume abd stand volume but you can increase the size of remaining volumes after mirroring it with 73 GB HDD.

Re: Replacing boot disks

Sachin Rajput — Tue, 16 Sep 2008 07:14:20 GMT

Kuldeep is absolutely right.
You may not be able to change the size of the stand and root logical volumes because they need the contiguous free PEs due to contiguous allocaction policy.

BUt as you do not need to extend the size of the lvols of vg00 . you can simply go form mirroring and replacing the smaller disk with the large one.