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Corrupted Files from iSCSI Targets

Posted on 2013-10-30
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Last Modified: 2013-11-03
We have a Netgear ReadyNAS 4200 with two iSCSI targets attached to a VM named Fstor.

Last week the Host of the VMs (running Server 2008 R2) had it's RAID controller fail and as a temporary fix, we attached the iSCSI targets to another VM (called Temp) on another host.

Users could then access the network drives and save etc to the ReadyNAS,

After fixing the RAID controller, we turned on the host and started using it as per normal. However, we didn't disconnect it from the Temp VM before doing so.

Users then remapped their drives to the original host,

As you can probably guess, we have had a number of files get corrupted during this whole process. We can't access the files through either the Fstor route OR the Temp route. When trying to open the file the system returns an error resembling "File is unreadable, or corrupt" etc.

I'm backing up all the files I currently have access to an am planning to do Chkdsks etc. Anyone have any tips?
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Question by:HIBS_ICT
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 1500 total points
ID: 39611139
If you have had TWO Hosts connected to the same iSCSI Target CONCURRENTLY, IT will cause corruption to the NTFS drive, as you have seen.

This is not supported, unless using Microsoft Failover Clustering or Clustered Shared Volumes.

The only tip I can provide is:-

1. Do not do this again.

2. Restore your data, the same has already been done.

The drive is corrupted, re-format and restore your data, elements of the file store, folders and files will be corrupted.
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by:HIBS_ICT
ID: 39611187
Recovery from backups are currently underway, however, I am still persisting on getting the files back as the backups are a couple days old.

On investigating EventVwr I notice errors stating that "The file system on the disk is corrupt and unusable. Please run the chkdsk utility on the volume F:". I  have started doing a chkdsk on the corrupted target and it has been stuck on "correcting error in index $0 for file 25" for the last 20 minutes. The waiting game seems to be the best thing looking at others' experiences online.... is the waiting in vain?

I found some software online that can bring back NTFS partitions, have you had any success with this in the past? Any recommendations?
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LVL 123
ID: 39611193
You will need to verify ALL files and folders, after recovery for corruption - manually.

As you will not be able to guarantee any files or folders recovered.

Chkdsk may be able to fix the corrupted chains and files.
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