topic Re: Problems with mirrored logical volume in Operating System - HP-UX

Problems with mirrored logical volume

Arnold Ferrer — Fri, 27 Sep 2002 19:27:49 GMT

I'm getting the following messages when I do a vgdisplay and lvldisplay. There was a bad disk that's been replaced on this mirrored root disk. Running HP11.00 on a L2000 server

# vgdisplay -v vg00
vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c1t2d0":
The specified path does not correspond to physical volume attached to
this volume group
vgdisplay: Warning: couldn't query all of the physical volumes.
--- Volume groups ---
VG Name /dev/vg00
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 3
Open LV 3
Max PV 16
Cur PV 2
Act PV 1
Max PE per PV 2500
VGDA 2
PE Size (Mbytes) 4
Total PE 2169
Alloc PE 2169
Free PE 0
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

# lvdisplay -v /dev/vg00/lvol3 | more
lvdisplay: Warning: couldn't query physical volume "/dev/dsk/c1t2d0":
The specified path does not correspond to physical volume attached to
this volume group
lvdisplay: Warning: couldn't query all of the physical volumes.
--- Logical volumes ---
LV Name /dev/vg00/lvol3
VG Name /dev/vg00
LV Permission read/write
LV Status available/stale
Mirror copies 1
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 6028
Current LE 1507
Allocated PE 3014
Stripes 0
Stripe Size (Kbytes) 0
Bad block off
Allocation strict/contiguous
IO Timeout (Seconds) default

--- Distribution of logical volume ---
PV Name LE on PV PE on PV
/dev/dsk/c2t2d0 1507 1507

--- Logical extents ---
LE PV1 PE1 Status 1 PV2 PE2 Status 2
0000 ??? 0662 stale /dev/dsk/c2t2d0 0662 current
0001 ??? 0663 stale /dev/dsk/c2t2d0 0663 current
0002 ??? 0664 stale /dev/dsk/c2t2d0 0664 current
0003 ??? 0665 stale /dev/dsk/c2t2d0 0665 current
0004 ??? 0666 stale /dev/dsk/c2t2d0 0666 current
0005 ??? 0667 stale /dev/dsk/c2t2d0 0667 current

Re: Problems with mirrored logical volume

Tom Danzig — Fri, 27 Sep 2002 19:33:27 GMT

Try:
vgcfgrestore -v /dev/vg00 /dev/dsk/c1t2d0
vgchange -a y /dev/vg00
vgsync /dev/vg00

This should restore the LVM config info to the disk.

If the disk was a bootable miiror, you need to do the necessary mkboot and lvlnboot steps also to make it bootable.

Re: Problems with mirrored logical volume

Tom Danzig — Fri, 27 Sep 2002 19:34:24 GMT

Error in last post:

vgcfgrestore -v /dev/vg00 /dev/dsk/c1t2d0

should be

vgcfgrestore -v /dev/vg00 /dev/rdsk/c1t2d0

Re: Problems with mirrored logical volume

Sridhar Bhaskarla — Fri, 27 Sep 2002 19:38:36 GMT

Hi Arnold,

After replacing the bad disk, there is a procedure to follow to restore the mirrors. I Do the following.

Note the contents of lvlnboot -v

#vgcfgrestore -n vg00 /dev/rdsk/c1t2d0
#vgchange -a y vg00
#mkboot /dev/dsk/c1t2d0
#mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/dsk/c1t2d0
#cd /usr/sbin/diag/lif
#mkboot -vg updatediaglif2 -p ISL -p HPUX -p AUTO /dev/rdsk/c1t2d0
#vgsync
#lvlnboot -b /dev/vg00/lvol1
#lvlnboot -r /dev/vg00/lvol3
#lvlnboot -s /dev/vg00/lvol2
#lvlnboot -d /dev/vg00/lvol2

Correct the above lvols from your old lvlnboot -v output.

#lvlnboot -R

-Sri

Re: Problems with mirrored logical volume

Ashwani Kashyap — Fri, 27 Sep 2002 19:43:34 GMT

Looks like your disk /dev/dsk/c1t2d0 has failed .

Do an lvdisplay on other logical volumes on that disk . If they don't show any stale extents then the problem is only with your /dev/vg00/lvol3 .

Do a diskinfo on that disk . Also do a pvdisplay on that disk . If both are succesful then your disk is alive and you only have to do a vgcfgrestore as decrbed in the above post .

But if not then you will have to replace the disk and resynx the VG onto it .

Look for disk errors in dmesg or your syslog.log file and check for any disk errors.

By guess is you have lost the PV .

Re: Problems with mirrored logical volume

Sanjay_6 — Sat, 28 Sep 2002 13:30:25 GMT

Hi Arnold,

Either you have a faulty disk at /dev/dsk/c1t2d0 or after replacing the disk, you have not rebuilt the mirror. If it is a faulty disk, replace the disk and then rebuild the mirror. If you have not rebuild the mirror, take a look at the doc below on how to do that,

http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062909815

Hope this helps.

Regds

Re: Problems with mirrored logical volume

Rajiv Singhal — Sat, 28 Sep 2002 21:40:45 GMT

Hi Arnold,

I am curious to know that vgdisplay output shows Current PV 2 Active PV 1 .

does diskinfo /dev/rdsk/c1t2d0 is normal . If not then disk is certainly bad.

Try give strings /etc/lvmtab and see how may disks are part of vg00. Is it only two disks or more . If there are only two then certainly
/dev/rdsk/c1t2d0 has gone bad & the commands as suggested by Tom , Sri, Ashwani & Sanjay will work .

If there are three or more PV then Is there any logical volume spanned across three or more PV .

Thanks,

Rajiv

Re: Problems with mirrored logical volume

Arnold Ferrer — Mon, 30 Sep 2002 14:04:55 GMT

I just wanted to say, thanks for all the helpful replies.