Iscsi Lun drive is not accessible

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Iscsi Lun drive is not accessible

Post by feras_L » Sat Jun 14, 2014 4:45 pm

i got a lun mapped throw Iscsi into our server that became not accessible, "the file or directory is corrupted and unreadable"
i tried to disconnect and reconnect the iscsi but still the same and it tells me i need to format this drive !!
from the QNAP it says all HDDs are okay. i even stopped and started the lun from there but didnt help.

is there anything we can do to get it back working or at least recover the data inside it?


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Re: Iscsi Lun drive is not accessible

Post by storageman » Mon Jun 16, 2014 5:29 pm

Perhaps, Easeus Data Recovery Wizard, supposedly can directly read iscsi target ext3 disk in windows with ntfs image on it.

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Re: Iscsi Lun drive is not accessible

Post by armyants » Sat Jul 26, 2014 4:48 am

Kind of late, but hopefully this might help others. I had a recent similar problem after rebooting a windows server that was connected to the iscsi target on a qnap we had and then this server (and eventually the other servers that were also connected to the same iscsi target) began to see a raw drive that needed to be formatted. Don't format the raw volume.

1. I went to all windows servers that were connected to the iscsi lun (probably not best practice but we had a handful using the same iscsi target for read only purposes) and disconnected iscsi using the windows iscsi initiator.
2. I noticed if you have already disconnected all targets then the target is ready to enable again. If not I guess you could disable the target and kick off any remaining connections. But I think the key is to make sure no devices are connected to the iscsi target.
3. From qnap, reenable iscsi target.
4. From one windows server - re-add iscsi target. Do the scan to fix the drive if requested. It does correct some stuff.
5. Any remaining servers - re-add iscsi target. The remaining servers didn't ask for drive to be scanned.
6. Verify files are there.

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