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[linux-lvm] VG dissappeared without a trace?



I was trying to extend my LVM partition to another disk, but being late and my
head not screwed on straight, things went terribly wrong.

I was using diskdrake (from Mandrake) and what I did was create a LVM partition
/dev/hdb6 and added it to my "quantum" VG which contained a single partition of
/dev/hda6. I was simply doing this as a test (my first time using LVM), so as
soon as it worked, I removed /dev/hdb6 from the "quantum" VG. I then proceeded
to create a larger partition /dev/hdc that I wanted to add to "quantum" for
good. I added it to the "quantum" VG and attemped to resize the "quantum" VG to
the full size of both /dev/hda6 (17gb) and /dev/hdc (12gb). Everything "seemed"
to go fine, so I exited from diskdrake and rebooted.

During the reboot, it said it couldn't mount /dev/quantum/1 as it was not a
proper block device. So I ran the following programs to try and collect as much
data as possible:

[root ipso root]# pvscan -v
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- walking through all physical volumes found
pvscan -- inactive PV "/dev/hda6"  is associated to an unknown VG (run vgscan)
pvscan -- inactive PV "/dev/hdb6"  is associated to an unknown VG (run vgscan)
pvscan -- total: 2 [19.01 GB] / in use: 2 [19.01 GB] / in no VG: 0 [0]

[root ipso root]# vgscan -v
vgscan -- removing "/etc/lvmtab" and "/etc/lvmtab.d"
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- no volume groups found


vgcfgrestore -n quantum -l -f /etc/lvmconf/quantum.conf.1.old
--- Volume group ---
VG Name               quantum
VG Access             read/write
VG Status             NOT available/resizable
VG #                  0
MAX LV                256
Cur LV                1
Open LV               0
MAX LV Size           255.99 GB
Max PV                256
Cur PV                2
Act PV                2
VG Size               19 GB
PE Size               4 MB
Total PE              4865
Alloc PE / Size       4328 / 16.91 GB
Free  PE / Size       537 / 2.1 GB
VG UUID               54LQnu-1gQl-mNuO-KR7U-yypa-woKi-iu7PRF

[root ipso lvmconf]# vgcfgrestore -n quantum -l -f /etc/lvmconf/quantum.conf
--- Volume group ---
VG Name               quantum
VG Access             read/write
VG Status             NOT available/resizable
VG #                  0
MAX LV                256
Cur LV                1
Open LV               0
MAX LV Size           255.99 GB
Max PV                256
Cur PV                3
Act PV                3
VG Size               30.88 GB
PE Size               4 MB
Total PE              7904
Alloc PE / Size       4328 / 16.91 GB
Free  PE / Size       3576 / 13.97 GB
VG UUID               54LQnu-1gQl-mNuO-KR7U-yypa-woKi-iu7PRF


[root ipso lvmconf]# pvdata -a /dev/hda6

--- Physical volume ---
PV Name               /dev/hda6
VG Name               quantum
PV Size               16.91 GB / NOT usable 3.12 MB [LVM: 137 KB]
PV#                   1
PV Status             NOT available
Allocatable           yes (but full)
Cur LV                1
PE Size (KByte)       4096
Total PE              4328
Free PE               0
Allocated PE          4328
PV UUID               e42Ge3-mpoP-PNat-1xLg-TMjr-4hRU-Q2agG9

--- Volume group ---
VG Name
VG Access             read/write
VG Status             NOT available/resizable
VG #                  0
MAX LV                256
Cur LV                1
Open LV               0
MAX LV Size           255.99 GB
Max PV                256
Cur PV                2
Act PV                2
VG Size               19 GB
PE Size               4 MB
Total PE              4865
Alloc PE / Size       4328 / 16.91 GB
Free  PE / Size       537 / 2.1 GB
VG UUID               54LQnu-1gQl-mNuO-KR7U-yypa-woKi-iu7PRF

--- List of logical volumes ---

pvdata -- logical volume "/dev/quantum/1" at offset   0
pvdata -- logical volume struct at offset   1 is empty
pvdata -- logical volume struct at offset   2 is empty
pvdata -- logical volume struct at offset   3 is empty
pvdata -- logical volume struct at offset   4 is empty
pvdata -- logical volume struct at offset   5 is empty
pvdata -- logical volume struct at offset   6 is empty
pvdata -- logical volume struct at offset   7 is empty
pvdata -- logical volume struct at offset   8 is empty
pvdata -- logical volume struct at offset   9 is empty
pvdata -- logical volume struct at offset  10 is empty
...
pvdata -- logical volume struct at offset 254 is empty
pvdata -- logical volume struct at offset 255 is empty

--- List of physical extents ---

PE: 00000  LV: 001  LE: 00000
PE: 00001  LV: 001  LE: 00001
PE: 00002  LV: 001  LE: 00002
...
PE: 04326  LV: 001  LE: 04326
PE: 04327  LV: 001  LE: 04327
--- List of physical volume UUIDs ---

000: e42Ge3mpoPPNat1xLgTMjr4hRUQ2agG9
001: --- EMPTY ---



[root ipso lvmconf]# pvdata -a /dev/hdb6


--- Physical volume ---
PV Name               /dev/hdb6
VG Name               quantum
PV Size               2.1 GB / NOT usable 1.75 MB [LVM: 123 KB]
PV#                   2
PV Status             NOT available
Allocatable           yes
Cur LV                0
PE Size (KByte)       4096
Total PE              537
Free PE               537
Allocated PE          0
PV UUID               PFyl3d-HSJD-adUL-vpzS-Sib3-jy78-tgR569

--- Volume group ---
VG Name
VG Access             read/write
VG Status             NOT available/resizable
VG #                  0
MAX LV                256
Cur LV                1
Open LV               0
MAX LV Size           255.99 GB
Max PV                256
Cur PV                3
Act PV                3
VG Size               30.88 GB
PE Size               4 MB
Total PE              7904
Alloc PE / Size       4328 / 16.91 GB
Free  PE / Size       3576 / 13.97 GB
VG UUID               54LQnu-1gQl-mNuO-KR7U-yypa-woKi-iu7PRF

--- List of logical volumes ---

pvdata -- logical volume "/dev/quantum/1" at offset   0
pvdata -- logical volume struct at offset   1 is empty
pvdata -- logical volume struct at offset   2 is empty
pvdata -- logical volume struct at offset   3 is empty
...
pvdata -- logical volume struct at offset 254 is empty
pvdata -- logical volume struct at offset 255 is empty

--- List of physical extents ---

PE: 00000  LV: ---  LE: -----
PE: 00001  LV: ---  LE: -----
PE: 00002  LV: ---  LE: -----
...
PE: 00535  LV: ---  LE: -----
PE: 00536  LV: ---  LE: -----
--- List of physical volume UUIDs ---

000: e42Ge3mpoPPNat1xLgTMjr4hRUQ2agG9
001: PFyl3dHSJDadULvpzSSib3jy78tgR569
002: TeWEsY1qLF4PPwfZAlljyT3KiE4CCajd


Unfortunately, I deleted the partition from the larger drive I was planning on
adding to the "quantum" VG, (/dev/hdc it didn't have any data on it yet). I
don't really care about /dev/hdb6 either, I would just like the data off of
/dev/hda6.

Partition table for: /dev/hda6
   Device Boot    Start       End    Blocks   Id  System
/dev/hda1   *         1       507    255496+  82  Linux swap
/dev/hda2           508     39813  19810224    5  Extended
/dev/hda5           508      4633   2079472+  83  Linux
/dev/hda6          4634     39813  17730688+  8e  Linux LVM

Any ideas how I can get /dev/hda6 mountable again? Thanks.

IpSo

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