topic Re: Need to re-mirror in Operating System - HP-UX

Need to re-mirror

N.D — Fri, 14 Nov 2003 10:01:04 GMT

Our root disk failed so we had this replace, luckily it was mirrored and we were able to boot from the mirrored. I nedd to now re-configure the original disk. Currently when doing an lvdisplay the replaced disk is showing as ???. How do I re-configure ?

--- Logical extents ---
LE PV1 PE1 Status 1 PV2 PE2 Status 2
0000 ??? 0000 stale /dev/dsk/c2t15d0 0000 current
0001 ??? 0001 current /dev/dsk/c2t15d0 0001 stale
0002 ??? 0002 stale /dev/dsk/c2t15d0 0002 current
0003 ??? 0003 stale /dev/dsk/c2t15d0 0003 current

Re: Need to re-mirror

Zigor Buruaga — Fri, 14 Nov 2003 10:07:42 GMT

Hi,

Attached the instructions to replace a root mirrored disk.

Kind regards,
Zigor

Re: Need to re-mirror

Bernhard Mueller — Fri, 14 Nov 2003 10:10:30 GMT

Hi,

I am a bit worried about the output you send regarding logical extend 0001: it shows "current" on the replaced disk and "stale" on the good one...

Basically it would go like:
strings /etc/lvmtab (find out what is the replaced disks device file, supposed it is c3t3d0 belonging to vg00... then:
vgcfgrestore -n vg00 /dev/rdsk/c3t3d0
vgchange -a y vg00
vgsync vg00

Good luck
Bernhard

Re: Need to re-mirror

A. Clay Stephenson — Fri, 14 Nov 2003 10:11:31 GMT

Let's assume that your replaced disk is c0t6d0.

1) vgcfgrestore -n /dev/vg00 /dev/rdsk/c0t6d0
2) vgchange -a y /dev/vg00
3) mkboot /dev/rdsk/c0t6d0
4) mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/c0t6d0
5) lvlnboot -R
6) vgsync /dev/vg00

You are done. I would then shutdown and verify that you can boot from the restored primary now.

Re: Need to re-mirror

N.D — Fri, 14 Nov 2003 10:23:42 GMT

got the following reply from the 'vgrestore' command

# vgcfgrestore -n /dev/vg00 /dev/rdsk/c2t6d0
vgcfgrestore: Couldn't query physical volume "/dev/dsk/c2t6d0":
The specified path does not correspond to physical volume attached to
this volume group
Volume Group configuration has been restored to /dev/rdsk/c2t6d0

Re: Need to re-mirror

Bernhard Mueller — Fri, 14 Nov 2003 10:28:27 GMT

Try vgdisplay -v vg00 and see if c2t6d0 is listed as available.

Re: Need to re-mirror

N.D — Fri, 14 Nov 2003 10:33:14 GMT

Looks like its syncing fine .... so will the new replaced root disk automatically mirror data from the mirror disk.

Re: Need to re-mirror

Bryan D. Quinn — Fri, 14 Nov 2003 10:34:12 GMT

Hey Missy,

I had a failed boot drive on one of my N-4000's two nights ago. I got the same errors you are seeing. I have attached the procedure that I wrote up to handle it and get my system back up.

I must say, I don't understand why you have a discrepency in the stale/current state on extent 0001.

Hope this helps you!
-Bryan

Re: Need to re-mirror

Bernhard Mueller — Fri, 14 Nov 2003 10:36:36 GMT

check pvdisplay /dev/dsk/c2t6d0 | grep Stale

Re: Need to re-mirror

Bernhard Mueller — Fri, 14 Nov 2003 10:52:25 GMT

do not forget the mkboot and lvlnboot commands that Clay mentioned, *after* that
check lvlnboot -v (that c2t6d0 is a "Boot Disk") then check setboot to see if it is primary or alternate boot path.

*If* you can, try to boot from the failed disk to verify, if not take note to get a downtime for reboot. Halt at BCH and enter
bo pri
or
bo alt
(whichever it is)

Regards,
Bernhard

Re: Need to re-mirror

Todd McDaniel_1 — Fri, 14 Nov 2003 11:42:28 GMT

Just a comment on procedure Missy...

Did I infer by your OP that you rebooted to the alt disk and didn't replace the disk while you had the system down? Some systems if they aren't configured as hpux -lq will not boot to the alt without stopping at the interrupt isl prompt.

That would have been a great time to replace the bad disk.

Judging by your output from lvdisplay, It appears that you rebooted with out a disk in the primary slot.

most newer systems will allow you to replace a disk online without rebooting, but it is good if possible to replace a disk while the box is down, even for mirrored ones.

I personally had a bad root disk about 2 weeks ago and did it all online without rebooting.

No, points UNLESS you find this usefull since you already have several solutions to your question.