topic Re: Disk mirroring in Operating System - HP-UX

Disk mirroring

Aftab Sadiq — Fri, 24 Nov 2000 14:57:02 GMT

We have got HP9000 (N4000) Server running HP-UX(11.0) 64-bit with two internal hard disks.
First hard disk is bootable disk which has OS and oracle installed. 2nd hard disk is unused and I want to make it mirror of first disk.
Here are steps that I am going to do.

1. pvcreate -B /dev/rdsk/c2t6d0
2. vgextend /dev/vg00 /dev/dsk/c2t6d0
3. mkboot /dev/dsk/c2t6d0
4. mkboot -a "hpux -lq" /dev/rdsk/c2t6d0
5. lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c2t6d0
6. lvextend -m 1 /dev/vg00/lvol2 /dev/dsk/c2t6d0
7. lvextend -m 1 /dev/vg00/lvol3 /dev/dsk/c2t6d0
8. lvextend -m 1 /dev/vg00/lvol4 /dev/dsk/c2t6d0
9. lvextend -m 1 /dev/vg00/lvol5 /dev/dsk/c2t6d0
10. lvextend -m 1 /dev/vg00/lvol6 /dev/dsk/c2t6d0
11. lvextend -m 1 /dev/vg00/lvol7 /dev/dsk/c2t6d0
12. lvextend -m 1 /dev/vg00/lvol8 /dev/dsk/c2t6d0
13. lvextend -m 1 /dev/vg00/lvol9 /dev/dsk/c2t6d0
14. lvlnboot -R

c2t6d0 is 2nd disk.

Please correct me if you find anything missing or wrong

Thanks

Aftab

Re: Disk mirroring

Eileen Millen — Fri, 24 Nov 2000 15:06:17 GMT

Looks good.
Your number 2. step was fourth on my list.
I don't know if that matters.

lvlnboot -v will show that both disk are being used.#
lvlnboot -v
Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
/dev/dsk/c2t6d0 (10/0.6.0) -- Boot Disk
/dev/dsk/c2t5d0 (10/0.5.0) -- Boot Disk
Boot: lvol1 on: /dev/dsk/c2t6d0
/dev/dsk/c2t5d0
Root: lvol3 on: /dev/dsk/c2t6d0
/dev/dsk/c2t5d0
Swap: lvol2 on: /dev/dsk/c2t6d0
/dev/dsk/c2t5d0
Dump: lvol2 on: /dev/dsk/c2t6d0, 0

Re: Disk mirroring

Eileen Millen — Fri, 24 Nov 2000 15:10:59 GMT

Sorry, number 3. should be /dev/rdsk

Re: Disk mirroring

Rainer_1 — Fri, 24 Nov 2000 15:17:55 GMT

just an addition for step 3.
if you have installed Diagnostics then you could add the offline diags to the second disk

mkboot -b /usr/sbin/diag/lif/updatediaglif -l /dev/rdsk/c2t6d0

Re: Disk mirroring

Insu Kim — Sat, 25 Nov 2000 03:07:49 GMT

This is what i'm doing.

1. pvcreate -B /dev/rdsk/c2t6d0
2. vgextend /dev/vg00 /dev/dsk/c2t6d0
3. mkboot /dev/rdsk/c2t6d0
4. mkboot -a "hpux -lq" /dev/rdsk/c2t6d0
5. lvextend -m 1 /dev/vg00/lvol1
6. lvextend -m 1 /dev/vg00/lvol2
7. lvextend -m 1 /dev/vg00/lvol3
8. lvextend -m 1 /dev/vg00/lvol4
9. lvextend -m 1 /dev/vg00/lvol5
10. lvextend -m 1 /dev/vg00/lvol6
11. lvextend -m 1 /dev/vg00/lvol7
12. lvextend -m 1 /dev/vg00/lvol8
13. lvextend -m 1 /dev/vg00/lvol9
14. cd /usr/sbin/diag/lif
15. mkboot -b updatediaglif -p ISL -p AUTO -p HPUX -p LABEL /dev/rdsk/c2t6d0
( This is to create a lif with all utilities on alternate boot disk. )
15. lvlnboot -R

Re: Disk mirroring

David Hixson — Tue, 05 Dec 2000 19:04:06 GMT

Eileen is right that you need to make sure that lvlnboot displays all of the correct pointers to boot, root, and swap. The man pages are pretty good if you need to make any changes.

Another thing to check is that you probably want to mirror the volumes in the order in which they where created. The order the list on a vgdisplay should be accurate. If you have expanded any of them since you first built the system you may see a slight performance improvement if you mirror to this new disk, remove the primary, and then mirror back so everything is contiguous.

Finaly, you can use 'lifls -lv /dev/dsk/whatever' to check the lif information on each disk and make sure they are the same'.

Re: Disk mirroring

Brad Anderson — Tue, 05 Dec 2000 23:29:24 GMT

Don't forget to run setboot -a and specify your alternate boot path.