LVM Disk Replacement

[Ron Marchak_1]

I have a HP9000, K360 with four internal drives, two 4GB and two 9 GB. The 11.X OS is running on a single 4 GB drive. My filesystems are root, stand, usr, var, opt, tmp, and home. I would like to migrate the entire root volume group from the 4 GB drive to the 9 GB drive and when complete remove the 4 GB drives from the system to use elsewhere. I have Mirror UX and On-Line JFS on the system. All the disks are currently in the root VG and the root VG is currently not mirrored. Any suggestions on how to approach this?

[Anthony Goonetilleke]

There is a couple thoughts on this you could do it with mirroring have a look at Doc ID
KBAN00000347 from the ITRC it will walk you through the steps. The alternative is to make a recovery tape via ignitue UX make_recovery and then swap the disks and restore the tape.

[Denver Osborn]

It doesnt seem like mirroring would resolve your situation. The MAX PE per PV is probably set too low to accomodate the 9GB drive. You'd be better with creating a make_recovery tape and restoring vg00 from the tape to the 9GB drive.

for more information on Ignite/UX
http://www.software.hp.com/products/IUX

[Stefan Farrelly]

Denvers solution gets my support.

[KwangHee Yi]

Why don't you try that with Ignite/UX?
It may be a good solution to reinstall the O/S.

At first, make a installation tape with a command make_recovery, and then, boot with that tape. At the booting, there is several pathes you can choose. Choose installation. and install os on the new 9GB disk.

Ignite/UX is on the ITRC web.

[Lars J. Granheim]

Ron, I have a good approach to this back at the office. The approach dows not require you to use Ignite-UX. I'm however not at the office at the moment, so if you'd like to receive the approach, mail me at ljg@lilleborg.no

Lars

[CHRIS_ANORUO]

Hi,

If you increase NPROC, MAXUSERS and NPTY
to a considerable value it will increase the value of NFILE.
You can use the oolowing values:
MAXUSERS=400
NPROC=4096
NPTY=512

[Nancy Hubert]

Here is the steps the make_recovery interactively, this way you select your new boot drive and it will re-create the vg00 with enough Max PE per PV for you bigger drive.

- Boot from the make_recovery tape.

- At the prompt, press within 10 seconds to cancel batch mode installation.

- Answer 'y' to really cancel non-interactive install and start the user interface.

- Specify your keyboard language.

- At the Ignite Welcome Menu, go into "Advanced Options".

- In Advanced Options, choose [edit (vi) config file].

- Using the vi editor, change the LAST occurrence of RECOVERY_MODE to equal
TRUE instead of FALSE (ie: RECOVERY_MODE=TRUE). Write and exit the file.

- Back at the Advanced Options menu, select OK to go back to the Welcome Menu.

- At the Welcome Menu, select [Install HP-UX].

- When prompted, change the User Interface Option to Advanced Installation.

- Make system configuration changes as appropriate via the itool interactive
menus.

- Select Go! when you are ready to begin the restore.

[Cheryl Griffin]

Denver's resolution also gets my vote.
He is exactly right about the max_pe's. If the vgcreate defaults were taken, it will accommodate a 4 gig disk, not a 9 gig.

[Victor BERRIDGE]

Denvers solution gets my vote too, I believe like Cheryl that you would finish up with at the most 8GB on the 9 you have...(pvextend limits...)

[Dave Wherry]

Ron says that all of those disks are in the root vg so Max PE per PV may not be a problem. Check it out and don't speculate. Do a "vgdisplay /dev/vg00" and see what it is set to. If it is 1024 then it is set to allow a 4GB drive as the largest drive and you will be wasting more than half of that 9GB drive.
If it is somewhere around 9200 or higher (I'm not sure what the number should be) then you are OK with the 9GB drive. The mirroring approach would work.
However, I do agree with the previous posts and think you should do the make_recovery method.

[Alan Riggs]

I side with Dave. If the disks are already in the root VG, then it may have been created to accomodate the 9GB drives. It is easy to check -- vgdisplay -v vg00.

If you show the full drives, simply reduce the VG by one 9GB drive. pvcreate that drive as a boot volume. Then follow the steps for mirroring a root drive. (mkboot, mirror LVs, setboot, etc.)

When you are done, boot off of the alternat path (9GB mirror) to test. If it works, use setboot to make that path primary and reduce the 4GB drive out of the VG.

If the full 9GB drive is not availale, then the make_recovery tape will be you best path.