SCSI Tape problem after full write

[Matthew Bertrand]

I am trying to use a Dell PV-122T LTO autoloader on FreeBSD 4.10-RELEASE,
but am having some difficulties with it after writing a full tape.

The tape drive is recognized properly and device entries are created. Here's
the relevant information from my dmesg:

sa0 at asr0 bus 0 target 6 lun 0
sa0: <HP Ultrium 1-SCSI E32K> Removable Sequential Access SCSI-3 device
ch0 at asr0 bus 0 target 5 lun 0
ch0: <DELL PV-122T D37r> Removable Changer SCSI-2 device
ch0: 8 slots, 1 drive, 1 picker, 0 portals

(this is prior to having ch loaded into the kernel -- just trying to get the
tape drive to work for right now)

I'm attempting to use syutils/bacula to perform network backups, so
following the instructions in the port, I used tapetest to write a full tape
to verify I wouldn't lose any data after filling a tape.  It took 2 hours
and 11 minutes to fill up the 100GB tape, and it provided me this output:

crazyeddie# c++ -g -O2 -Wall -pthread -c tapetest.c
crazyeddie# c++ -g -O2 -Wall -pthread tapetest.o -o tapetest
crazyeddie# ./tapetest /dev/nsa0
*rewind
Rewound /dev/nsa0
*rawfill
Begin writing blocks of 64512 bytes.
+++++++ [...]

weof_dev
ioctl MTWEOF error on /dev/nsa0. ERR=Device not configured.
Bad status from weof -1. ERR=Device not configured
Write failed.  Last block written=1656999. stat=-1 ERR=Input/output error
*rewind
Rewind error on /dev/nsa0. ERR=Device not configured.
Bad status from rewind. ERR=Device not configured
*

After exiting out of that, it I would get the same Device not configured
error trying anything else (mt, tar). 

Ran the following commands to try and get the tape drive back online:

crazyeddie# camcontrol devlist
<ADAPTEC RAID-5 380E>              at scbus0 target 1 lun 0 (pass0,da0)
<DELL PV-122T D37r>                at scbus0 target 5 lun 0 (pass1)
<HP Ultrium 1-SCSI E32K>           at scbus0 target 6 lun 0 (pass2,sa0)
crazyeddie# camcontrol tur sa0 -v
Unit is not ready
CAM status is 0xa
crazyeddie# camcontrol reset 0:6:0
Reset of 0:6:0 was successful
crazyeddie# camcontrol devlist
<ADAPTEC RAID-5 380E>              at scbus0 target 1 lun 0 (pass0,da0)
<DELL PV-122T D37r>                at scbus0 target 5 lun 0 (pass1)
crazyeddie#

After that, the only way I could get the tape drive recognized again was to
power cycle the autoloader and then restart FreeBSD. I've enabled CAMDEBUG
in the kernel ( which is generic other than CAMDEBUG & ch), but the output
from that doesn't seem to provide me with anything useful (I don't know what
to look for). 

Does anyone have any suggestions for this problem or any tips on
troubleshooting it further?

Thanks,

-Matthew Bertrand