Openfiler problems

I have Supermicro NAS, it has 2 raid cards and 8 1TB HDDs are attached to each card, both have RAID 5 configuration, I'm using Openfiler as an OS. I'm using that storage for backups, lately I started heaving problems with large backups (<500GB) I ran a full backup last night and it looks like it got stuck, the log file in Openfiler grew 4GB over night, it shows similar error messages over and over

 kern.err<3>: Jan  4 10:15:59 store-01 kernel: iscsi_trgt: fileio_make_request(63) I/O error 4096, -5
kern.err<3>: Jan  4 10:15:59 store-01 kernel: sd 1:0:0:0: rejecting I/O to offline device
kern.err<3>: Jan  4 10:15:59 store-01 kernel: iscsi_trgt: fileio_make_request(63) I/O error 4096, -5
kern.err<3>: Jan  4 10:15:59 store-01 kernel: sd 1:0:0:0: rejecting I/O to offline device
kern.err<3>: Jan  4 10:15:59 store-01 kernel: iscsi_trgt: fileio_make_request(63) I/O error 4096, -5
kern.err<3>: Jan  4 10:15:59 store-01 kernel: sd 1:0:0:0: rejecting I/O to offline device
kern.err<3>: Jan  4 10:15:59 store-01 kernel: iscsi_trgt: fileio_make_request(63) I/O error 4096, -5
kern.err<3>: Jan  4 10:15:59 store-01 kernel: sd 1:0:0:0: rejecting I/O to offline device
kern.err<3>: Jan  4 10:15:59 store-01 kernel: iscsi_trgt: fileio_make_request(63) I/O error 4096, -5
kern.err<3>: Jan  4 10:15:59 store-01 kernel: sd 1:0:0:0: rejecting I/O to offline device
kern.err<3>: Jan  4 10:15:59 store-01 kernel: iscsi_trgt: fileio_make_request(63) I/O error 1024, -5
kern.err<3>: Jan  4 10:15:59 store-01 kernel: sd 1:0:0:0: rejecting I/O to offline device
kern.err<3>: Jan  4 10:15:59 store-01 kernel: iscsi_trgt: fileio_make_request(63) I/O error 3072, -5
kern.err<3>: Jan  4 10:15:59 store-01 kernel: sd 1:0:0:0: rejecting I/O to offline device

What do they mean?

Thank you,

Sergey
Sergey_NesterenkoAsked:
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arnoldCommented:
I'm not sure I get you have your openfiler accessing a device via iscsi?
I.e. the Supermicro NAS is being used by openfiler as an ISCSI target for storage of backups?

Network between the NAS and openfiler dedicated? Or does it share the network with other things?

The error is that openfiler can not access the resource and marks it as being offline.
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Sergey_NesterenkoAuthor Commented:
Yes the Supermicro NAS is being used by openfiler as an ISCSI target.

Thank you, I checked and the partition where the backups were going has crashed and went off line. I will now get the Supermicro support to get help.

Thank you very much
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arnoldCommented:
make sure you were not accessing the iscsi resource on the NAS from multiple locations as that could lead to data corruption.
iscsi does not have an arbitration mechanism to handle multiple hsots accessing the same target. iscsi is a raw SCSI commands that are sent over IP based networks.

http://www.cgsecurity.org/wiki/Main_Page testdisk was helpful to recover ntfs data when the partition table become corrupt.  You situation that sounds as though the volume crashed on the NAS is likely more serious. Good luck.
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