MIrroring system disks

[Joe Profaizer]

I just finished mirroring my logical volumes for my system disk (lvextend -m 1 ......). Do you have to mirror the swapfile(s) (/dev/vg00/lvol2) also?

[Vincenzo Restuccia · Accepted solution]

Yes,I think you mirror lvol2 otherwise the mirror not boot.

[Shannon Petry]

TO be safe, the answer is yes. If you are going to spend the system resources to run mirroring, you may as well do it right. All of the volumes in vg00 should be mirrored. Dont forget to make the mirror disk bootable before you mirror the volume group.

Regards,
Shannon

[Bill McNAMARA_1]

yes,
remember that when your pri disk fails, and you've got some disactivate process in swap, you will switch pv.
If you switch and the disactivated process is not paged in, because swap is not mirrored, you'll probably end up getting a panic.
You will boot up and reinit swap though, although you could have avoided the panic by mirroring everything.

Later,
Bill

[Bill McNAMARA_1]

Heres an example script to setup a mirror on a disk c1t5d0

# pvcreate -B /dev/rdsk/c1t5d0
# vgextend vg00 /dev/dsk/c1t5d0
# mkboot -l /dev/rdsk/c1t5d0
# mkboot -a "hpux (;0)/stand/vmunix" /dev/rdsk/c1t5d0
# for LVOL in /dev/vg00/lv*
> do
> echo $LVOL
> lvextend -m 1 $LVOL
> done

Later,
Bill