topic Re: Lost vg01! in Operating System - HP-UX

Lost vg01!

TWBSupport — Thu, 07 Jul 2005 13:04:08 GMT

Hi all.. My power outage whoes continue.. Different box than my hostname issue, still 11.11.
System is running fine, can access ALL data & ALL disks are showing up claimed & working properly. If I do the following:
vgdisplay -v vg01
vgdisplay: Volume group "/dev/vg01" does not exist in the "/etc/lvmtab" file.
vgdisplay: Cannot display volume group "vg01".

Again, all hard drives are reporting fine & data is being accessed on the disks that are allocated to vg01. What's the best method to get vg01 back into the lvmtab w/o losing data? /etc/vg01 does exist & does have all the entries in it. I'm reading posts on the forums, but nothing actually tells me if I will lose data or not following the advice given. As always, thanks a TON for your time.

Re: Lost vg01!

Patrick Wallek — Thu, 07 Jul 2005 13:06:58 GMT

The first thing I would try is:

# mv /etc/lvmtab /etc/lvmtab.old

# vgscan -av

This will NOT result in a loss of data. vgscan rebuilds the /etc/lvmtab file from the information it finds in the VGRA on the disks themselves.

# man vgscan

for more information.

Re: Lost vg01!

Rick Garland — Thu, 07 Jul 2005 13:07:01 GMT

Check out the vgscan command.
This will update the lvmtab file.

First make a backup copy of the present lvmtab file.

Then run vgscan in the preview mode - make sure all you want is there.

vgscan -p

Can use the verbose mode as well, the -v switch to the command

Re: Lost vg01!

Juan M Leon — Thu, 07 Jul 2005 13:24:57 GMT

I concur with everyone also I would suggest check the PV. after the vgscan
do the following,
strings /etc/lvmtab
you will see something like this
/dev/vg01
/dev/dsk/c#t#d#
then execute pvdisplay -v /dev/dsk/c#t#d#

hope it helps

Re: Lost vg01!

TWBSupport — Thu, 07 Jul 2005 14:36:39 GMT

Well... this doesn't look good at all.
s02 # vgscan -av
Creating "/etc/lvmtab".

/dev/vg00
/dev/dsk/c1t15d0
/dev/dsk/c3t15d0

Following Physical Volumes belong to one Volume Group.
Unable to match these Physical Volumes to a Volume Group.
Use the vgimport command to complete the process.
/dev/dsk/c4t0d0
/dev/dsk/c4t1d0

Following Physical Volumes belong to one Volume Group.
Unable to match these Physical Volumes to a Volume Group.
Use the vgimport command to complete the process.
/dev/dsk/c4t2d0
/dev/dsk/c4t3d0
/dev/dsk/c4t14d0

vgscan: has no correspoding valid raw device file under /dev/rdsk.
Verification of unique LVM disk id on each disk in the volume group
/dev/vg01 failed.

/dev/vg02
/dev/dsk/c4t6d0

/dev/vg03
/dev/dsk/c4t7d0
/dev/dsk/c4t8d0
/dev/dsk/c4t9d0
/dev/dsk/c4t10d0
/dev/dsk/c4t11d0

/dev/vg04
/dev/dsk/c4t12d0
/dev/dsk/c4t13d0

Scan of Physical Volumes Complete.
s02 # strings /etc/lvmtab
/dev/vg00
/dev/dsk/c1t15d0
/dev/dsk/c3t15d0
/dev/vg02
/dev/dsk/c4t6d0
/dev/vg03
/dev/dsk/c4t7d0
/dev/dsk/c4t8d0
/dev/dsk/c4t9d0
/dev/dsk/c4t10d0
/dev/dsk/c4t11d0
/dev/vg04
/dev/dsk/c4t12d0
/dev/dsk/c4t13d0
s02 # pvdisplay -v /dev/dsk/c4t0d0
pvdisplay: Couldn't find the volume group to which
physical volume "/dev/dsk/c4t0d0" belongs.
pvdisplay: Cannot display physical volume "/dev/dsk/c4t0d0"

Any advice GREATLY appreciated...

Re: Lost vg01!

Venkatesan_5 — Thu, 07 Jul 2005 22:39:51 GMT

From the /etc/lvmtab file it seems all below mentioned disks belongs to /dev/vg01
c4t0d0
c4t1d0
c4t2d0
c4t3d0
c4t14d0

As per my understanding ....you are able to access all data and you have all /dev/vg01 files also.....okay..
If you want the data and an entry in /etc/lvmtab ...then please follow the steps given below.....

1. Please take the backup of all /dev/vg01/lvol's which are currently mounted
2. unmount all /dev/vg01 /lvol's
3.# mkdir /dev/vg05 ---- for example
4. # mknod /dev/vg05/group c 64 0x050000
5. # vgimport /dev/vg05 /dev/dsk/c4t0d0 /dev/dsk/c4t1d0 /dev/dsk/c4t2d0 /dev/dsk/c4t3d0 /dev/dsk/c4t14d0
6. now check in /dev/vg05 by # ls /dev/vg01 ....now u could see all the device files for all logical volumes...
7. # vgchange -a y /dev/vg05
8. now mount all filesystems as per your requirement.
------------------------ please do not give vgscan after all these steps -------------------------------
hope this should work....i tested it in server ....it worked....
please note you cannot do vgexport /dev/vg01 because /dev/vg01 entry is not there in /etc/lvmtab ...

regds
Venkatesan

Re: Lost vg01!

Giacomo TOTTI — Fri, 08 Jul 2005 06:35:40 GMT

Hi,
check if you have these files under /etc/lvmconf directory:

vg01.conf
vg01.conf.old

so try this solution:

vgcfgrestore -f /etc/lvmconf/vg_01.conf /dev/dsk/c4t0d0
vgcfgrestore -f /etc/lvmconf/vg_01.conf /dev/dsk/c4t1d0

OR

vgcfgrestore -f /etc/lvmconf/vg_01.conf.old /dev/dsk/c4t0d0
vgcfgrestore -f /etc/lvmconf/vg_01.conf.old /dev/dsk/c4t1d0

hope this help

Giacomo

Re: Lost vg01!

Devender Khatana — Fri, 08 Jul 2005 20:52:21 GMT

Hi,

As indicated in the error during vgscan it seems the device files for disks under /dev/dsk are not equal in no. as under /dev/rdsk. Were these modified/removed manually after reboot? Compare two directories & there should not be any differences.

HTH,
Devender