[mythtv-users] Mythdora Box Died...Need to Recover Logical Volume

[Tom+Dale]

Hello Everyone,
The motherboard on my backend failed and so I've decided to take this opportunity to start fresh.  Unfortunately, it appears as though my hard disk may have been impacted adversely too.  When I installed Mythdora 12 and allowed it to configure everything, it established an LVM partition (presumably for future expansion) even though I just had the single 500GB disk.

I have been trying to post the following question on the Linux-LVM mailing list for almost a week, but I can't seem to get it through (something about formatting).  Anyway, I thought that since it is a Myth project that I am working on, perhaps somebody here would be able to assist me.  Here's my original post:
==========================

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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