[linux-lvm] Lost all logical volumes in two volume groups?

[Dan Elder]

I received this info when I posted a similar question, perhaps this will be
useful.
----------------------

hi, i found your message in the redhat lvm-mailinglist doing a google
resarch about exactly that same problem.

because i'm not member of the mailing list i prefer to write directly to
tell you what i found after days of resarch and as my last resort facing the
fact to lose everything on a single 750gb array ;)

preface: i had only one(!) lv spanning the whole 750gb vg. i think this is
pretty important for the following procedure - especially if the exact
parameters are not known (in my case because the whole system was set up
trough a 3rd party linux-based NAS)

1) i simply recreated that one lv with lvcreate (my luck it was initially
set up using all standards and max. possible size)

2) now there was no filsystem (as i supposed). but a filesystemrepair
(xfs_repair in my case) did the magic. it found the 2nd superblock intact
and after a short while everything was in place again.

3) feels like winning the lottery.

4) i'm a true linux-novice and to me that procedure felt extreme risky, but
i found nothing, absolutely nothing else that comes any near just a little
help in such a case; no tools, no how-tos, nothing. so i tried it, at last
considering this isn't totally out of logic.


bye & greetings from vienna,
gerald gstaltner

-----Original Message-----
From: linux-lvm-bounces at redhat.com
[mailto:linux-lvm-bounces at redhat.com]On Behalf Of Jimisola Laursen
Sent: Tuesday, January 17, 2006 4:12 PM
To: linux-lvm at redhat.com
Subject: Re: [linux-lvm] Lost all logical volumes in two volume groups?


Hi!

I made the post below a almost a month ago, but I never received any
replies.

I would really appreciate some help on this matter since I haven't been able
to
solve it.

Kindly,
Jimisola

----- Original Message -----
From: "Jimisola Laursen" <public at jimisola.com>
To: <linux-lvm at redhat.com>
Sent: Thursday, December 22, 2005 11:36 AM
Subject: [linux-lvm] Lost all logical volumes in two volume groups?


> Hi!
>
> After a failed Mandriva upgrade I can no longer use my two LVM (vg01 and
> vg02).
> When the upgrade failed I unplugged my disks after two-three boots where
> ReiserFS found errors until I had reinstalled my system (with OpenSuse).
>
> I just plugged in my disks again and the LVM partitions are recognized,
but
> there are no LVs!
> Is there anyway for me to fix this?
>
> I have an old copy of /etc/lvm with archive and backup directories
including
> vg01_00000.vg and vg01_00001.vg.
> No .vg files for vg02 though, but that VG is less important than the vg01
one.
>
> VG system: current OpenSuse system
> VG vg01: shows no LV (have .vg files)
> VG vg02: shows no LV (have no .vg files)
>
> All partitions are ReiserFS.
>
> Regards,
> Jimisola
>
> fermat:/scratch # vgchange -ay
>  0 logical volume(s) in volume group "vg02" now active
>  5 logical volume(s) in volume group "system" now active
>  0 logical volume(s) in volume group "vg01" now active
> fermat:/scratch # vgdisplay
>  --- Volume group ---
>  VG Name               vg02
>  System ID
>  Format                lvm2
>  Metadata Areas        1
>  Metadata Sequence No  3
>  VG Access             read/write
>  VG Status             resizable
>  MAX LV                255
>  Cur LV                0
>  Open LV               0
>  Max PV                255
>  Cur PV                1
>  Act PV                1
>  VG Size               45.90 GB
>  PE Size               4.00 MB
>  Total PE              11750
>  Alloc PE / Size       0 / 0
>  Free  PE / Size       11750 / 45.90 GB
>  VG UUID               crHchE-236z-G24u-AGhW-MgDd-nTxD-1MnxHn
>
>  --- Volume group ---
>  VG Name               system
>  System ID
>  Format                lvm2
>  Metadata Areas        1
>  Metadata Sequence No  7
>  VG Access             read/write
>  VG Status             resizable
>  MAX LV                0
>  Cur LV                5
>  Open LV               5
>  Max PV                0
>  Cur PV                1
>  Act PV                1
>  VG Size               97.66 GB
>  PE Size               4.00 MB
>  Total PE              25001
>  Alloc PE / Size       11506 / 44.95 GB
>  Free  PE / Size       13495 / 52.71 GB
>  VG UUID               qMe8jO-4Qyl-Weno-k09t-n2Pd-Jo5G-Co7kpn
>
>  --- Volume group ---
>  VG Name               vg01
>  System ID
>  Format                lvm2
>  Metadata Areas        1
>  Metadata Sequence No  12
>  VG Access             read/write
>  VG Status             resizable
>  MAX LV                255
>  Cur LV                0
>  Open LV               0
>  Max PV                255
>  Cur PV                1
>  Act PV                1
>  VG Size               232.88 GB
>  PE Size               4.00 MB
>  Total PE              59618
>  Alloc PE / Size       0 / 0
>  Free  PE / Size       59618 / 232.88 GB
>  VG UUID               YowUTE-awQj-OyKP-0UGH-nwkD-MZzt-e8P0kK
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>


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