mount: unknown filesystem type 'LVM2_member'

[Mathieu Malaterre <mathieu.malaterre@gmail.com>]

Hi there,

  I am trying to mount an IDE disk from an old (broken) machine. I am
using a USB adaptor. After attaching the IDE disk to the USB adaptor,
I cannot do anything with the disk.

dmesg reveal:

[13927.196346] usb-storage: device scan complete
[13927.503084] scsi 4:0:0:0: Direct-Access     ST320413 A
  0000 PQ: 0 ANSI: 0
[13927.504751] sd 4:0:0:0: Attached scsi generic sg2 type 0
[13927.505864] sd 4:0:0:0: [sdb] 39102336 512-byte logical blocks:
(20.0 GB/18.6 GiB)
[13927.506727] sd 4:0:0:0: [sdb] Write Protect is off
[13927.506734] sd 4:0:0:0: [sdb] Mode Sense: 27 00 00 00
[13927.506739] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[13927.508348] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[13927.508355]  sdb: sdb1 < sdb5 sdb6 sdb7 >
[13927.549046] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[13927.549050] sd 4:0:0:0: [sdb] Attached SCSI disk
[13930.050201] sr 0:0:0:0: [sr0] Unhandled sense code
[13930.050209] sr 0:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[13930.050218] sr 0:0:0:0: [sr0] Sense Key : Hardware Error [current]
[13930.050227] sr 0:0:0:0: [sr0] Add. Sense: Timeout on logical unit
[13930.050237] sr 0:0:0:0: [sr0] CDB: Read(10): 28 00 00 01 87 68 00 00 01 00
[13930.050256] end_request: I/O error, dev sr0, sector 400800
[13930.050267] Buffer I/O error on device sr0, logical block 100200

When trying to mount, I get:


$ sudo mount  -t auto  /dev/sdb7 /tmp/test
mount: unknown filesystem type 'LVM2_member'

But it looks like I do have a LVM2 filesystem on this disk:

$ sudo pvs
  PV         VG          Fmt  Attr PSize   PFree
  /dev/sda2  dhcp-67-183 lvm2 a-   148.81G    0
  /dev/sdb7  Debian      lvm2 a-    17.89G    0

Same issue with :

$ sudo lvdisplay /dev/sdb7
  Volume group "sdb7" not found


Any suggestion greatly appreciated !
Thanks,
-- 
Mathieu