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List:       linux-lvm
Subject:    [linux-lvm] lvm missing uuid
From:       lee <funnyvoice () tlabs ! ac ! za>
Date:       2012-01-22 13:09:26
Message-ID: 4F1C0A86.1080605 () tlabs ! ac ! za
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Hi


Im having trouble with a drive. I complains of a missing uuid.

I removed the drive from my server, and inserted a new clean drive for
testing. The removed drive was placed in cover for protection.
It contained the OS ( Scientific Linux 4.9 ). I reinserted the drive
after my tests.

I then got kernel panic, as the uuid of the one partition was missing.
Its import that i can at least recover data from this drive.

In the meantime I have put in place a replacement. So now the most
important part is to obtain the data from it.

#vgs
  Couldn't find device with uuid b6FYR1-4AJo-zYYy-7Rro-4d36-QbEK-G9L8hP.
  VG         #PV #LV #SN Attr   VSize   VFree 
  VolGroup00   2   2   0 wz-pn- 297.97g 224.00m
  myvg         1   1   0 wz--n- 465.56g      0

#vgchange -a y VolGroup00
  Couldn't find device with uuid b6FYR1-4AJo-zYYy-7Rro-4d36-QbEK-G9L8hP.
  Refusing activation of partial LV LogVol00. Use --partial to override.
  1 logical volume(s) in volume group "VolGroup00" now active


#vgscan --partial
  Partial mode. Incomplete logical volumes will be processed.
  Reading all physical volumes.  This may take a while...
  /dev/VolGroup00/LogVol00: read failed after 0 of 4096 at 0:
Input/output error
  /dev/VolGroup00/LogVol00: read failed after 0 of 4096 at 4096:
Input/output error
  Couldn't find device with uuid b6FYR1-4AJo-zYYy-7Rro-4d36-QbEK-G9L8hP.
  Found volume group "VolGroup00" using metadata type lvm2
  Found volume group "myvg" using metadata type lvm2

#lvscan --partial
  Partial mode. Incomplete logical volumes will be processed.
  /dev/VolGroup00/LogVol00: read failed after 0 of 4096 at 0:
Input/output error
  /dev/VolGroup00/LogVol00: read failed after 0 of 4096 at 4096:
Input/output error
  Couldn't find device with uuid b6FYR1-4AJo-zYYy-7Rro-4d36-QbEK-G9L8hP.
  ACTIVE            '/dev/VolGroup00/LogVol00' [295.81 GiB] inherit
  ACTIVE            '/dev/VolGroup00/LogVol01' [1.94 GiB] inherit
  ACTIVE            '/dev/myvg/rootvol' [465.56 GiB] inherit

#sfdisk -l /dev/sdc


sfdisk -l /dev/sdc

Disk /dev/sdc: 19457 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sdc1   *      0+     12      13-    104391   83  Linux
/dev/sdc2         13   19456   19444  156183930   8e  Linux LVM
/dev/sdc3          0       -       0          0    0  Empty
/dev/sdc4          0       -       0          0    0  Empty


I tried to use pvcreate --restorefile etc, but did not use -ff.

#Reference:
http://www.centos.org/docs/5/html/Cluster_Logical_Volume_Manager/mdatarecover.html

Anymore information I can provide...???

Regards
Lee


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