[linux-lvm] Data loss - vg gone

[linux-lvm] Data loss - vg gone

[Michael S. Fischer]

Hello,

We presently have 10 systems, each of which is configured according to the
specs at the bottom (vgdisplay -v output included).  One of the systems had
a common mode failure in which the RAID controller was not present to the
system on reboot; when we discovered this, we rebooted the system.  The RAID
controller and its virtual disk came back but the volume did not.  

vgscan found no volumes (and vgdisplay reports none), but according to
pvscan the physical volume signature is still there.  If I try to recreate
the volume I get the error message that the physical volume already belongs
to the volume group.

Is there any way I can recover the volume?  Any help would be sincerely
appreciated.

Thanks,

--Michael

Hardware:

- 2 x PIII processor
- 1GB RAM
- IDE boot disk
- 4 x 75GB IBM IDE drives, attached to a 3Ware Escalade 6410 RAID controller
in RAID 10 (stripe of mirrors) mode

LVM:

--- Volume group ---
VG Name               vg0
VG Access             read/write
VG Status             available/resizable
VG #                  0
MAX LV                256
Cur LV                1
Open LV               1
MAX LV Size           255.99 GB
Max PV                256
Cur PV                1
Act PV                1
VG Size               143.17 GB
PE Size               4 MB
Total PE              36652
Alloc PE / Size       30720 / 120 GB
Free  PE / Size       5932 / 23.17 GB
VG UUID               CQIxou-PFxE-pJbv-bslk-tkjy-BARP-c2toQB

--- Logical volume ---
LV Name                /dev/vg0/lv0
VG Name                vg0
LV Write Access        read/write
LV Status              available
LV #                   1
# open                 1
LV Size                120 GB
Current LE             30720
Allocated LE           30720
Allocation             next free
Read ahead sectors     120
Block device           58:0


--- Physical volumes ---
PV Name (#)           /dev/scsi/host2/bus0/target0/lun0/part1 (1)
PV Status             available / allocatable
Total PE / Free PE    36652 / 5932

--
Michael S. Fischer / michael at auctionwatch.com /
http://www.auctionwatch.com
Systems Engineer, AuctionWatch.com Inc. / Phone: +1 650 808 5842  

RE: [linux-lvm] Data loss - vg gone

[Michael S. Fischer]

Jens,

Actually, I managed to recover the volume by using vgcfgrestore.  After I
restored the VGDA the filesystem came right back up.

Many thanks to he LVM team for making sure the metadata is backed up! :-)

--Michael

-----Original Message-----
From: Jens Benecke
To: 'linux-lvm@sistina.com'
Sent: 6/5/01 4:07 PM
Subject: Re: [linux-lvm] Data loss - vg gone

On Tue, Jun 05, 2001 at 12:47:37PM -0700, Michael S. Fischer wrote:
> Hello,
> 
> vgscan found no volumes (and vgdisplay reports none), but according to
> pvscan the physical volume signature is still there.  If I try to
> recreate the volume I get the error message that the physical volume
> already belongs to the volume group.

Possible solution (worked here):

You need to edit the disk signatures and for each PV, insert all the
_other_ PV signatures in the right place. Go to #lvm on
irc.openprojects.org and bug 'roadrunner', he walked me through this and
it
worked. ;)


-- 
Jens Benecke     No Linux user has a 'Microsoft free system'. 'make
config'
                 in the kernel configuration was originally written by a
MS
		 employee.
http://www.hitchhikers.de/ - Die kostenlose Mitfahrzentrale für ganz
Europa

Re: [linux-lvm] Data loss - vg gone

[AJ Lewis]

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On Wed, Jun 06, 2001 at 01:07:07AM +0200, Jens Benecke wrote:
> On Tue, Jun 05, 2001 at 12:47:37PM -0700, Michael S. Fischer wrote:
> > Hello,
> > 
> > vgscan found no volumes (and vgdisplay reports none), but according to
> > pvscan the physical volume signature is still there.  If I try to
> > recreate the volume I get the error message that the physical volume
> > already belongs to the volume group.
> 
> Possible solution (worked here):
> 
> You need to edit the disk signatures and for each PV, insert all the
> _other_ PV signatures in the right place. Go to #lvm on
> irc.openprojects.org and bug 'roadrunner', he walked me through this and it
> worked. ;)

Yeah, do that.  We should be able to fix you up.  I should be on the channel
by 0900 CDT tomorrow (June 6).

Regards,
-- 
AJ Lewis (aka, roadrunner)
Sistina Software Inc.                  Voice:  612-638-0500
1313 5th St SE, Suite 111              Fax:    612-638-0500
Minneapolis, MN 55414                  E-Mail: lewis@sistina.com
http://www.sistina.com

Current GPG fingerprint = 3B5F 6011 5216 76A5 2F6B  52A0 941E 1261 0029 2648
Get my key at: http://www.sistina.com/~lewis/gpgkey
 (Unfortunately, the PKS-type keyservers do not work with multiple sub-keys)

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Re: [linux-lvm] Data loss - vg gone

[Herman Knief]

Actually, I think vgcfgrestore fixed his problem.  :-)

 - Herman

AJ Lewis wrote:

> On Wed, Jun 06, 2001 at 01:07:07AM +0200, Jens Benecke wrote:
> > On Tue, Jun 05, 2001 at 12:47:37PM -0700, Michael S. Fischer wrote:
> > > Hello,
> > >
> > > vgscan found no volumes (and vgdisplay reports none), but according to
> > > pvscan the physical volume signature is still there.  If I try to
> > > recreate the volume I get the error message that the physical volume
> > > already belongs to the volume group.
> >
> > Possible solution (worked here):
> >
> > You need to edit the disk signatures and for each PV, insert all the
> > _other_ PV signatures in the right place. Go to #lvm on
> > irc.openprojects.org and bug 'roadrunner', he walked me through this and it
> > worked. ;)
>
> Yeah, do that.  We should be able to fix you up.  I should be on the channel
> by 0900 CDT tomorrow (June 6).
>
> Regards,
> --
> AJ Lewis (aka, roadrunner)
> Sistina Software Inc.                  Voice:  612-638-0500
> 1313 5th St SE, Suite 111              Fax:    612-638-0500
> Minneapolis, MN 55414                  E-Mail: lewis@sistina.com
> http://www.sistina.com
>
> Current GPG fingerprint = 3B5F 6011 5216 76A5 2F6B  52A0 941E 1261 0029 2648
> Get my key at: http://www.sistina.com/~lewis/gpgkey
>  (Unfortunately, the PKS-type keyservers do not work with multiple sub-keys)
>
> -----Begin Obligatory Humorous Quote----------------------------------------
> Error: Keyboard not attached. Press F1 to continue.
> -----End Obligatory Humorous Quote------------------------------------------
>
>   ------------------------------------------------------------------------
>    Part 1.2Type: application/pgp-signature