L8: Backup hang half way during backup process

[alisampras]

Dear all,

We tried to backup 180GB of data to a Sun L8 tape drive via StorEdge Backup 7.1 software.

Half way during the backup process, the backup hanged and i saw the following error message:

[ID 107833 kern.warning] WARNING: /pci@8,600000/pci@1/scsi@4/st@5,0 (st19):

backup Error for Command: read Error Level: Fatal

backup scsi: [ID 107833 kern.notice] Requested Block: 1413 Error Block: 1413

backup scsi: [ID 107833 kern.notice] Vendor: HP Serial Number:

backup scsi: [ID 107833 kern.notice] Sense Key: Media Error

backup scsi: [ID 107833 kern.notice] ASC: 0x11 (unrecovered read error), ASCQ: 0x0, FRU: 0x0

backup root: [ID 702911 daemon.notice] Sun StorEdge(TM) Enterprise Backup media: (warning) /dev/rmt/0cbn moving: fsr 3770 (read): drive status is Drive reports no error - but state is unknown

Please let me know, why the backup hanged and what is the error message about?

Thanks in advance.