Hi,

> dev open failed: dev.c:432 Unable to open device "DLT8000" (/dev/nst0):
> ERR=\
> Input/output error

Sounds like some kind of hardware (SCSI) problem, with the kernel driver
resetting the bus and losing the device at some point. Is your
cabling/termination ok?
Are there any error messages in the kernel log (dmesg)?

> Drive is a QUANTUM DLT8000, External operating on a DIFF SCSI
> connection. The adaptor shows as

> 00:09.0 SCSI storage controller: Adaptec AHA-2940U/UW / AHA-39xx /
> AIC-7895 (rev 04)

Are you sure this controller can handle differential (LVD? HVD?) SCSI?

FWIW, I've been using a DLT8000 drive with bacula for the past two years
without a problem.

Andrea

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