My iscsi partition seems corrupted!. I cannot mount it anymore.

I am using a a Ready NAS storage in which I set up some LUNs. I mounted one in my email server and another in my backup server. It was working great however few days I go I configured a server with windows Server 2008  and formatted a new LUNs with NTFs (which was previously created on the NAS) surprisingly  after that my other 2 LUNs got corrupted. I tried this:

1. Mount the partition again

However I got this message:
"mount: wrong fs type, bad option, bad superblock on /dev/sdc1,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail or so
"

2. Tried fsck

One or more block group descriptor checksums are invalid.

By the way, the partitions where formatted using ext4. Besides, I got snapshots from the NAS.

Please help me recover this data, its very important!.
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Ludwig DiehlSystems ArchitectAsked:
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SandyCommented:
try mounting them by specifying ext2 or ext3 and see if this works.. Many times this happens with journals.

Check this once.

TY/SA
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Ludwig DiehlSystems ArchitectAuthor Commented:
No luck :-(. Got this:

[257045.733027] EXT4-fs (sde1): ext4_check_descriptors: Checksum for group 0 failed (38096!=32584)
[257045.733032] EXT4-fs (sde1): group descriptors corrupted!
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SandyCommented:
What command did you used to mount it with ext2 ?

TY/SA
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Ludwig DiehlSystems ArchitectAuthor Commented:
mount -t ext2  .....
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gheistCommented:
fsck.ext4 ... ....
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Davis McCarnOwnerCommented:
iSCSI is never supposed to be directly accessed by more than one PC.  Other PC's using it should use a share setup on that PC.  Accessing an iSCSI device from more than one causes corruption.
Can you still get to the ReadyNAS remote interface and what is its model number?
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Ludwig DiehlSystems ArchitectAuthor Commented:
I can see the remote interface, but cannot mount it.
NETGEAR ReadyNAS 2120
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Davis McCarnOwnerCommented:
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Ludwig DiehlSystems ArchitectAuthor Commented:
I even tried creating a LUN from a snapshot (which are created daily), however I cannot access it.
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Ludwig DiehlSystems ArchitectAuthor Commented:
sorry for taking too long to answer, it's just I am extremely busy lately at work
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Ludwig DiehlSystems ArchitectAuthor Commented:
Thank you very much !!. It worked!!.
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