topic Re: Failed Mirror in 11.11 in Operating System - HP-UX

Failed Mirror in 11.11

Nyck_1 — Tue, 13 Aug 2013 07:54:12 GMT

Hello,

I have a server which has has it's mirror disk fail, the disk has now been replaced but I'm still having issues getting the mirroring set back up. Can someone let me know the process for this task please?

lvreduce -m 0 -A n /dev/vg00/lvol1 /dev/dsk/c2t0d0

lvreduce: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

lvreduce: Warning: couldn't query all of the physical volumes.

lvreduce: Physical volume "/dev/dsk/c2t0d0" does not belong

to volume group "/dev/vg00".

Logical volume "/dev/vg00/lvol1" is not reduced.

milcon01:/#

milcon01:/# vgreduce vg00 /dev/dsk/c2t0d0

vgreduce: Couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

milcon01:/#

milcon01:/# pvcreate -B /dev/rdsk/c2t0d0

pvcreate: The physical volume "/dev/dsk/c2t0d0" is already recorded in the "/etc/lvmtab" file.

milcon01:/#

milcon01:/# strings /etc/lvmtab

/dev/vg00

/dev/dsk/c2t0d0

/dev/dsk/c2t1d0

cheers

nick

Re: Failed Mirror in 11.11

Patrick Wallek — Tue, 13 Aug 2013 13:25:42 GMT

If you can find the "When Good Disks Go Bad" whitepaper, that is an immense help when replacing a disk.

In your situation, the steps I would do are:

--Verify the disk is CLAIMED in 'ioscan -fnC disk'

# vgcfgrestore -n vg00 /dev/rdsk/c2t0d0

# vgchange -a y vg00

# vgdisplay -v vg00

(check and make sure /dev/dsk/c2t0d0 shows as 'available' in the output)

# mkboot /dev/rdsk/c2t0d0

# mkboot -a "hpux -lq" /dev/rdsk/c2t0d0

# vgsync vg00

The vgsync will resync the mirrors between your 2 disks.

Re: Failed Mirror in 11.11

Robert_Jewell — Tue, 13 Aug 2013 14:57:16 GMT

Here is a link to the document Patrick referenced:

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01911837/c01911837.pdf

-Bob

Re: Failed Mirror in 11.11

Torsten. — Tue, 13 Aug 2013 15:05:20 GMT

You maybe rebooted with the bad disk, so this disk is not listed in "vgdisplay" at all. Likely you performed some steps to remove the disk already (usually not needed at all).

Perform the suggested steps and do

# vgdisplay -v vg00

# lvlnboot -v

and post.

If you have problems to do a "vgcfgrestore", you need to do a "pvchange -a n ..." first.

Re: Failed Mirror in 11.11

Nyck_1 — Wed, 14 Aug 2013 06:49:37 GMT

Hello,

I'm not sure what happened with this server as I was not the first port of call to fix it as it's in our US data center, but we managed to get it working using the below syntax:-

# vgcfgrestore -n vg00 /dev/rdsk/c2t0d0

This will restore the LVM headers to the new disk.

Next proceed to re-activate the VG:

# vgchange -a y vg00

You should now see the disk as part of the VG again.

Assuming this is a mirrored boot disk then proceed with the mkboot commands:

# mkboot -l /dev/rdsk/c2t0d0

# mkboot -a "hpux -lq" /dev/rdsk/c2t0d0

Reset the root/boot/dump/swap assignments:

# lvlnboot -R

# lvlnboot -v (view to confirm)

Start the sync of any mirrored logical volumes:

# vgsync /dev/vg00

Thanks to all who responded :-)

cheers

nick