topic Re: D250 Question- Need to replace boot disk. in Operating System - HP-UX

D250 Question- Need to replace boot disk.

joe_91 — Wed, 05 Dec 2007 23:00:03 GMT

I have a D250 running 11.11 and I have 2 disks currently (one 2 GB and another 8 GB). The 2 GB is not used. So my plan is to do the following as it is not mirrored currently.

1. Install the Mirror-Ux s/w (we will have to purchase this)

2. Pull out the 2 GB (c0t5d0) unused disk and insert a new 18 GB disk or 36 GB disk in that place

3. Sync the mirror from the current 8 GB (c0t8d0) to the new disk (c0t5d0) (18 GB).

4. Boot the machine using the new disk (c0t5d0)

5. After booting successfully thru the new disk now replace the c0t8d0 with a new 18gb or 36gb disk (in this case should I do a vgreduce/lvreduce? I don’t think I have the olr patch, so that I can pvchange -a N, will it be possible to install before all this changes? these are my questions. In short I want to replace both the disks to an 18 GB or 36 GB (whatever is supported for D250) and mirror them as well. What could be the issues with this process? I am pasting a brief ouput below for understanding.

# ioscan -fnC disk
Class I H/W Path Driver S/W State H/W Type Description
=====================================================================
disk 0 8/4.5.0 sdisk CLAIMED DEVICE SEAGATE ST32550W
/dev/dsk/c0t5d0 /dev/rdsk/c0t5d0
disk 1 8/4.8.0 sdisk CLAIMED DEVICE SEAGATE ST39236LC
/dev/dsk/c0t8d0 /dev/rdsk/c0t8d0
disk 2 8/16/5.6.0 sdisk CLAIMED DEVICE TOSHIBA CD-ROM XM-5401T
A
/dev/dsk/c1t6d0 /dev/rdsk/c1t6d0
# diskinfo /dev/rdsk/c0t5d0
SCSI describe of /dev/rdsk/c0t5d0:
vendor: SEAGATE
product id: ST32550W
type: direct access
size: 2082636 Kbytes
bytes per sector: 512
jaws root # diskinfo /dev/rdsk/c0t8d0
SCSI describe of /dev/rdsk/c0t8d0:
vendor: SEAGATE
product id: ST39236LC
type: direct access
size: 8891556 Kbytes
bytes per sector: 512
# strings /etc/lvmtab
/dev/vg00
/dev/dsk/c0t8d0
# model
9000/821/D250

Thanks

Joe

Re: D250 Question- Need to replace boot disk.

A. Clay Stephenson — Thu, 06 Dec 2007 00:06:19 GMT

Your plan is almost certainly flawed. When a VG is first created, unless specific options are used, the default behavior is to size the number of PE's and the PE size to accomodate the last physical volume (disk) listed in the vgcreate command. This means that should you wish to use a larger disk, you will only be able to use 8GiB or so and the remainder will go unused. Now if you are willing to live with the majority of the new disk going unused, you can proceed. If not, you should do a make_tape_recovery, remove your original boot disk, and replace it with your larger disk and Ignite the system. You will then rebuild vg00 so that the entire large disk will be available and you can then mirror to another large disk. The beaty of this approach is that your original disk is intact (and out of the system) so that no matter how badly things go, you have a safe Plan B.

Re: D250 Question- Need to replace boot disk.

Khairy — Thu, 06 Dec 2007 01:01:00 GMT

i totally agree with clay recommendation.

I've done disk migration a lot for hp9000 and if involve vg00, make_tape_recovery would be the best. Just make sure, you install the recent ignite-ux version (Version C.x.x.x).

good luck

Re: D250 Question- Need to replace boot disk.

Pupil_1 — Thu, 06 Dec 2007 01:05:33 GMT

The other option will be to consider DRD (Dynamic Root Disk)!

http://h20392.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=DynRootDisk

Re: D250 Question- Need to replace boot disk.

Pupil_1 — Thu, 06 Dec 2007 01:06:40 GMT

looks like DRD is not supported for 11.11 !