Root disk problem.

[AnthonySN]

Hi,
One of the root disk which is mirrored has failed and we need to replace the disk.
what is the best way to replace the disk.
OS is hpux 11.0.

[Steven E. Protter · Accepted solution]

Shalom,

If possible break the mirrors.

lvsplit
lvextend m=0

Normally its not possible to break the mirrors.

So.

Remove and replace the disk.

If the disk is not hot swappable, restart the system.

vgreduce -f vg00

This will force the now dead disk out of vg00. Follow the post vgreduce instructions strictly and carefully.

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf.

re-mirror and test vg00 mirror configuration.

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

[AnthonySN]

Hi SEP,
Thanks for the detailed reply.

how abt the below process.
1.replace the def disk with new disk.
2.mv /etc/lvmtab /etc/lvmtab.old
3.pvcreate -f -B /dev/rdsk/newdisk.
4.mv /etc/lvmtab.old /etc/lvmtab
5.vgcfgrestore -n vg00
6.vgchange -a y /dev/vg00
7.vgsync vg00
8.mkboot /dev/rdsk/newdisk
9.mkboot -a "hpux -lq" /dev/rdsk/newdisk
10.lvlnboot -Rv /dev/vg00

Let me know if im missing anything.

[Steven E. Protter]

Shalom,

My procedure was developed and tested on 11.11.

I can't test it on 11.00 but you seem to be missing these steps.

# 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?

I don't know if they are needed or correct for 11.00.

I like your plan and think it will work though I'd do it in an order more like my procedure (pride of ownership perhaps?).

A test boot off the alternate root disk is the only way to confirm your configuration is correct.

SEP

[Torsten.]

As mentioned before, see

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

There is everything you need.

Regarding your steps:

No need for steps 2, 3 and 4

start with step 1 followed by 5 and extend this step with the disk device.

step10:
lvlnboot -r /dev/vg00/lvol3
lvlnboot -b /dev/vg00/lvol1
lvlnboot -s /dev/vg00/lvol2
lvlnboot -d /dev/vg00/lvol2

step 11:
lvlnboot -v


@SEP:

in current 11.11 the file updatediaglif/2 (offline diagnostics) is no longer there.

It is now avaiolable from http://software.hp.com
and installed via swinstall (if needed).

[AnthonySN]

Successfully changed the disk without any problem following the above procedure.

Thanks evryone.

[AnthonySN]

followed the given procedure.