RAID5, unknown filesystem and disk failure

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I have an Ubuntu 12.04 machine with 3 disks in RAID5, and the RAID controller is on the motherboard.
After almost a year of flawless use, it seems that one disk had a failure. Every time I restarted the machine, it said that there was a partition with damaged filesystem and a fsck was forced to run. I tried to recover it with a LiveCD using the fsck command on the unmounted disks, with no results.

At one point, grub gave me the following:

error> unknown filesystem

On the LiveCD, the lsblk command gives this:

$ sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL
NAME                                 FSTYPE            SIZE MOUNTPOINT LABEL
loop0                                squashfs        651.6M /rofs      
sda                                  isw_raid_member 596.2G            
└─isw_cifbdbija_RAID-ABE (dm-0)                      1.2T            
  ├─isw_cifbdbija_RAID-ABE1 (dm-1) vfat               94M            
  ├─isw_cifbdbija_RAID-ABE2 (dm-2)                   1.2T            
  └─isw_cifbdbija_RAID-ABE3 (dm-3) swap              3.7G            
sdb                                  isw_raid_member 596.2G            
└─isw_cifbdbija_RAID-ABE (dm-0)                      1.2T            
  ├─isw_cifbdbija_RAID-ABE1 (dm-1) vfat               94M            
  ├─isw_cifbdbija_RAID-ABE2 (dm-2)                   1.2T            
  └─isw_cifbdbija_RAID-ABE3 (dm-3) swap              3.7G            
sdc                                  isw_raid_member 596.2G            
└─isw_cifbdbija_RAID-ABE (dm-0)                      1.2T            
  ├─isw_cifbdbija_RAID-ABE1 (dm-1) vfat               94M            
  ├─isw_cifbdbija_RAID-ABE2 (dm-2)                   1.2T            
  └─isw_cifbdbija_RAID-ABE3 (dm-3) swap              3.7G            
sdd                                                    3.7G            
└─sdd1                               vfat              3.7G /cdrom     MYLINUXLIVE

Please help me, I need to recover the content of these disks. It would be very nice to recover the system, as well, instead of formatting and re-installing.

UPDATE:
This might help, as I’m trying to mount the 2nd partition of the RAID. I tried to 

$ sudo mount -t vfat /dev/mapper/isw_cifbdbija_RAID-ABE2 /mnt

and I got 

mount: wrong fs type, bad option, bad superblock on /dev/mapper/isw_cifbdbija_RAID-ABE2

Answer

Attribution
Source : Link , Question Author : Alessandro Cappello , Answer Author : Community

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