topic Re: Replacing root mirrored hot swappable disk in Operating System - HP-UX

Replacing root mirrored hot swappable disk

PR_4 — Tue, 02 Aug 2005 13:35:52 GMT

Hi all

My disk became flaky and it was pulled out. The disk has been replaced and ioscan now shows the disk is claimed. Before replacement however the lvreduce or vgreduce was not performed and therefore "strings /etc/lvmtab" shows the /dev/dsk/cxtyd0.
please let me know if the following procedure is OK for remirroring the new disk. Thanks very much

1) vgcfgrestore -n vg00 /dev/rdsk/cxtydz
2) mkboot -l /dev/rdsk/cxtydz
3) mkboot -a hpux /dev/rdsk/cxtydz
4) lvextend -m /dev/vg00/lvol(1-6) /dev/rdsk/cxtydz

Re: Replacing root mirrored hot swappable disk

S.Arunkumar — Tue, 02 Aug 2005 13:40:35 GMT

Hi PR

First you have to vgreduce
Then you can go ahead and do the vgcfgrestore and rest is same as similar to creating a new mirror copy for root disk

Regards
S.Arunkumar

Re: Replacing root mirrored hot swappable disk

Mel Burslan — Tue, 02 Aug 2005 13:57:50 GMT

after vgcfgrestore you need to run

vgchange -a y vg00

also my mkbood commands are as follows:

mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/cxtxdx
mkboot -l /dev/rdsk/cxtxdx

then

cd /usr/sbin/diag/lif
mkboot -b updatediaglif2 -p ISL -p AUTO -p HPUX -p LABEL /dev/rdsk/cxtxdx

(if you are on a 32 bit platform, change updatediaglif2 with updatediaglif)

and to do this, you do not need to do vgreduce command. If you vgreduce'd the vg then you need to use vgextend instead of vgcfgrestore.

Re: Replacing root mirrored hot swappable disk

DCE — Tue, 02 Aug 2005 14:00:33 GMT

I would suggest you use the -lq option on the mkboot command. This will allow the system to boot without a quorom of disks.

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

be sure to run the same command against the other boot disk as well.

Re: Replacing root mirrored hot swappable disk

generic_1 — Tue, 02 Aug 2005 14:10:02 GMT

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

This link will explain how to fix your disk in very great detail. It was written for situations just like yours.

Re: Replacing root mirrored hot swappable disk

Devender Khatana — Tue, 02 Aug 2005 14:12:22 GMT

Hi,

It could display error.
If required you should use vgreduce -f option to reduce otherwise it will report an error.

Once done with lvreduce you should be able to extend the VG and remirror.

Also do a lvlnboot -R.

Here is the official guide to achive this.
http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

HTH,
Devender

Re: Replacing root mirrored hot swappable disk

Devender Khatana — Tue, 02 Aug 2005 14:33:44 GMT

Here is another good document to be referred for online disk replacement.

http://docs.hp.com/en/6430/LVM_OLR_whitepaper.pdf

HTH,
Devender

Re: Replacing root mirrored hot swappable disk

Eknath — Wed, 03 Aug 2005 04:56:47 GMT

Here is what you can do...

1. ioscan -H path### (eg 0/4/0/0 do not use .) # put disk as claimed from no-hw
2. ioscan -funC disk|more # check to see hw is claimed
3. mv /etc/lvmtab /etc/lvmtab.old # pvcreate fails if disk is in lvmtab
4. pvcreate -f -B /dev/rdsk/c_t_d0 # sets aside a boot area
5. mv /etc/lvmtab.old /etc/lvmtab # moves it back
6. vgcfgrestore -n vg00 /dev/rdsk/c_t_d0 # restores headers on drive
7. vgchange -a y /dev/vg00 # puts drive online
8. vgsync vg00 # if disk does not automatically start syncing (if stale)
9. mkboot /dev/rdsk/c_t_d0 # puts the boot sector in the boot area
10. mkboot -a "hpux -lq" /dev/rdsk/c_t_d0 # puts HPUX in the auto file
11. lvlnboot -Rv /dev/vg00 # updates the LIF with the info from the BDRA
12. cd /usr/sbin/diag/lif
13. mkboot -b updatediaglif -p ISL -p HPUX -p LABEL -p AUTO /dev/rdsk/c_t_d0 # to put ODE, etc. back on boot area
14. vgdisplay -v vg00 # to check it

Cheers!!!
eknath

Re: Replacing root mirrored hot swappable disk

Torsten. — Wed, 03 Aug 2005 05:47:02 GMT

Do NOT perform your step 4!
If your disk is gone and you inserted a new one, you need to restore all config to the disk (including mirror information) - step 1.
Then activate the VG (vgchange -a y vgxx).
Then make it bootable (your step 2). Set the bootstring (your step 3). Update the offline diag (mkboot -b updatediaglif ...). Write the boot information (lvlnboot -r/-b/-s/-d ...). Now you only have to resync your vg (vgsync vgxx). That's all.

Re: Replacing root mirrored hot swappable disk

PR_4 — Wed, 03 Aug 2005 07:55:17 GMT

Thanks everyone. I had to use vgsync vg00 instead of the final step and it worked. Thanks again guys.