How to break the mirror and change root disk in HP-UX?

How to break the mirror and change root disk?

Breaking mirror.

Need to make sure first that we know which mirror to break.

I have root disks mirrored in which /dev/dsk/c0t0d0 is mirrored to the disk /dev/dsk/c1t1d1 and I want to replace the disk /dev/dsk/c1t1td1 by the disk /dev/dsk/c2t2d2 which is a free disk ann not being used and is same or bigger in size than /dev/dsk/c1t1d1

To remove the Mirror Extents from the disk /dev/dsk/c1t1d1,

for i in /dev/vg00/lv*

do

lvreduce -m 0 $i /dev/dsk/c1t1d1

done

lvlnboot -vR : update the LVLNBOOT information.

vgreduce /dev/vg00 /dev/dsk/c1t1d1

The above removes the disk from the VG rootvg vg00

Add the new disk and mirror the LVs to the new disk.

The below is for a PA-RISC system, for Itanium Systems there is an EFI partition to be present on the root disk and the process is slightly different.

ioscan -fnC disk

diskinfo -b /dev/rdsk/c2t2d2 : verify the size of the new disk to which mirroring will go.

pvcreate -B /dev/rdsk/c2t2d2

mkboot -l /dev/rdsk/c2t2d2

mkboot -a "hpux -lq" /dev/rdsk/c2t2d2

vgextend /dev/vg00 /dev/dsk/c2t2d2

for i in /dev/vg00/lv*

do

lvextend -m 1 $i /dev/dsk/c2t2d2

done

The above may take substantial time.

Once the mirror completes update the lvlnboot and /stand/bootconf

lvlnboot -vR

Edit the line pertatining to older /dev/dsk/c1t1d1 and replace that with /dev/dsk/c2t2d2