[linux-lvm] Logical Volume Inaccessible

[Digimer]

What does 'pvscan; vgscan; lvscan' show? If the LVs show 'inactive', try 
'lvchange -ay <lv_path>', then 'lvscan' should show the LV as 'ACTIVE'. 
If so, try mounting the LV.

On 11/01/14 11:28 PM, Tom+Dale wrote:
>
>
> I am hoping that someone can assist me with a problem that I have on a
> single 500GB drive that was partitioned by "Mythdora" a (now defunct)
> distribution of Fedora + MythTV.  I had this system in use for several
> years and recently the motherboard died.  When I put the hard disk into a different machine it would not boot up (no surprise); however, I also
> was unable to access the partitions from a Knoppix Live CD (I tried both 5.1 and 7.0).  When I tried with Knoppix to mount the partitions I
> discovered that something is wrong with the partition tables or logical
> volumes.  Here are some examples of the commands that I tried along with the results.  Will you please give me some advice about the best way to recover data from sda2 (the recordings)?  Thank you in advance!
> -Tom
>
> ---------------------------------------------
> root at Microknoppix:/# fdisk -l
>
> Disk /dev/sda: 500.1 GB, 500107862016 bytes
> 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 4096 bytes
> I/O size (minimum/optimal): 4096 bytes / 4096 bytes
> Disk identifier: 0x000537fa
>
>     Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *          63      409662      204800   83  Linux
> Partition 1 does not start on physical sector boundary.
> /dev/sda2          409663   976768064
>   488179201   8e  Linux LVM
> Partition 2 does not start on physical sector boundary.
> root at Microknoppix:/# parted -l
> Model: ATA WDC WD5000AADS-1 (scsi)
> Disk /dev/sda: 500GB
> Sector size (logical/physical): 512B/4096B
> Partition Table: msdos
>
> Number  Start   End    Size   Type     File system  Flags
>   1      32.3kB  210MB  210MB  primary  ext4         boot
>   2      210MB   500GB  500GB  primary               lvm
>
>
> Warning: Unable to open /dev/fd0 read-write (Read-only file system).  /dev/fd0
> has been opened read-only.
> Error: /dev/fd0: unrecognised disk
>   label
>
> Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0
> has been opened read-only.
> Error: /dev/sr0: unrecognised disk label
>
> Error: /dev/zram0: unrecognised disk label
>
> Warning: Unable to open /dev/cloop0 read-write (Read-only file system).
> /dev/cloop0 has been opened read-only.
> Error: /dev/cloop0: unrecognised disk
>   label
>
> root at Microknoppix:/# gdisk -l /dev/sda
> GPT fdisk (gdisk) version 0.8.5
>
> Partition table scan:
>    MBR: MBR only
>    BSD: not present
>    APM: not present
>    GPT: not present
>
>
> ***************************************************************
> Found invalid GPT and valid MBR; converting MBR to GPT format.
> ***************************************************************
>
> Disk /dev/sda: 976773168 sectors, 465.8 GiB
> Logical sector size: 512 bytes
> Disk identifier (GUID): E9B4E83E-86F3-4843-801E-495E6864F682
> Partition table holds up to 128 entries
> First usable sector is 34, last usable sector is 976773134
> Partitions will be aligned on 8-sector boundaries
> Total free space is 5099 sectors (2.5
>   MiB)
>
> Number  Start (sector)    End (sector)  Size       Code  Name
>     1              63          409662   200.0 MiB   8300  Linux filesystem
>     2          409663       976768064   465.6 GiB   8E00  Linux LVM
> root at Microknoppix:/# vgchange -ay
>    /dev/sda2: read failed after 0 of 1024 at 0: Input/output error
>    /dev/sda2: read failed after 0 of 1024 at 4096: Input/output error
>    /dev/sda2: read failed after 0 of 2048 at 0: Input/output error
>    No volume groups found
> root at Microknoppix:/# lvscan
>    /dev/sda2: read failed after 0 of 1024 at 0: Input/output error
>    /dev/sda2: read
>   failed after 0 of 1024 at 4096: Input/output error
>    /dev/sda2: read failed after 0 of 2048 at 0: Input/output error
>    No volume groups found
> root at Microknoppix:/# lvm lvdisplay
>    /dev/sda2: read failed after 0 of 1024 at 0: Input/output error
>    /dev/sda2: read failed after 0 of 1024 at 4096: Input/output error
>    /dev/sda2: read failed after 0 of 2048 at 0: Input/output error
>    No volume groups found
> root at Microknoppix:/# vgscan --mknodes
>    Reading all physical volumes.  This may take a while...
>    /dev/sda2: read failed after 0 of 1024 at 0: Input/output error
>    /dev/sda2: read failed after 0 of 1024 at 4096: Input/output error
>    /dev/sda2: read failed after 0 of 2048 at 0: Input/output error
>    No volume groups found
>    No volume groups found
> root at Microknoppix:/#
>
> _______________________________________________
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> linux-lvm at redhat.com
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>


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