topic Re: Replace non-functional Mirror Disk with a bigger disk in Operating System - HP-UX

Replace non-functional Mirror Disk with a bigger disk

Ulrich Tehrani — Fri, 27 Feb 2004 11:12:47 GMT

Hello all,

is it possibel to replace a non-functional mirror disk with a disk bigger than the crashed one ?

Thanks in advance.

Rgds

Uli

Re: Replace non-functional Mirror Disk with a bigger disk

RAC_1 — Fri, 27 Feb 2004 11:17:46 GMT

Yes it is possible. But you will be wasting the space.

Replace the disk. Do a vgcfgrestore on it and do vgchange -a y rootvg and then vgsync.

Re: Replace non-functional Mirror Disk with a bigger disk

Pete Randall — Fri, 27 Feb 2004 11:18:12 GMT

Uli,

Yes, it's possible. However, when you add the disk into the VG, the PE size and MAX PE per VG will prevent you from utilizing any more space on it than the there was on the previous, smaller disk. The only way to correct this is to recreate the entire VG.

Pete

Re: Replace non-functional Mirror Disk with a bigger disk

Sridhar Bhaskarla — Fri, 27 Feb 2004 11:18:36 GMT

Hi Uli,

You can. However, you will not be able to use it entirely. TO find out how much you can use. Note "PE Size" (A) and "Max PE" (B" from 'vgdisplay vgxx' command. Multiply A and B. That's the size in MB you can grab out of the new disk.

If this is part of VG00, then take make_tape_recovery tape. Schedule downtime and restore the tape onto the new disk. Once everything is up, running and verified, add the smaller disk into vg00 and extend the mirrors.

If this is not vg00, then create a new VG with the filesystems. Take downtime and copy the data from smaller disk to the new VG. Verify everything, destory the old VG and add the old disk to new VG and extend the mirrors.

-Sri

Re: Replace non-functional Mirror Disk with a bigger disk

Steven E. Protter — Fri, 27 Feb 2004 11:21:06 GMT

Yes,

You can re-establish the mirroring, if thats a critical issue(it should be).

The better course of action is to break the mirror, rebuild the volume group and then re-mirror accodring to these instructions, which I'm sure you already have.

pvcreate -B /dev/rdsk/c1t0d0 #use real disk

mkboot -l /dev/rdsk/c1t0d0
mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/c1t0d0 # use real disk

# mkboot -b /usr/sbin/diag/lif/updatediaglif -p ISL -p AUTO -p HPUX -p PAD -p LABEL /dev/rdsk/c?t?d?

If you are running 64-bit OS:

# mkboot -b /usr/sbin/diag/lif/updatediaglif2 -p ISL -p AUTO -p HPUX -p PAD -p LABEL /dev/rdsk/c?t?d?

vgextend /dev/vg00 /dev/dsk/c1t0d0 # same thing
lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c1t0d0

# real disk. repeat for other lvols

lvlnboot -r /dev/vg00/lvol3 # root fs /
lvlnboot -s /dev/vg00/lvol2 #swap
lvlnboot -d /dev/vg00/lvol2 #swap/dump
lvlnboot -b /dev/vg00/lvol1
lvlnboot -R
lvlnboot -v
setboot
setboot -a 52.1.0 # second disk

SEP

Re: Replace non-functional Mirror Disk with a bigger disk

Jannik — Fri, 27 Feb 2004 12:39:39 GMT

make a ignite tape of the old system. take out the old disk and re-install the system on the new disk.
Go out and bye a new big disk and mirror the system.