trouble with DLT 7000 TAPE DRIVER (fwd)

[Gianmaria Collazuol (tel. 055/2307659)]

Hello,
  Sorry to bother you with perhaps silly problem !
Working with: PC (2 x pentiumII x 350MHz) + RH linux 5.1 
(kernel 2.1.131) + Adaptec AIC-7890/1 Ultra2 SCSI host adapter + 
"Quantum DLT7000 Tape Driver" (plugged in scsi wide port).  
Problem: cannot read (with dd) DLT tapes written (not by me, not with 
this hardware, but perfectly readable by me with other hardware)    
with 256k sized blocks: all file's blocks read OK but the last one:
while reading this one the command dd falls in "disk sleep" state 
and cannot be killed or signalled anyhow.
These are the related messages in the /var/log/messages file: 

Mar 16 16:43:04 pcepsi3 kernel: st0: Block limits 2 - 16777214 bytes.
Mar 16 16:43:04 pcepsi3 kernel: st0: Mode sense. Length 11, medium 85, WBS 90,BLL 8
Mar 16 16:43:04 pcepsi3 kernel: st0: Density 1b, tape length: 0, drv buffer: 1
Mar 16 16:43:04 pcepsi3 kernel: st0: Block size: 0, buffer size: 524288 (1blocks).
Mar 16 16:43:04 pcepsi3 kernel: st0: Write protected

(command: mt -t /dev/nst0 setblk 262144 --->)
Mar 16 16:44:13 pcepsi3 kernel: st0: Block limits 2 - 16777214 bytes.
Mar 16 16:44:13 pcepsi3 kernel: st0: Mode sense. Length 11, medium 85, WBS 90,BLL 8
Mar 16 16:44:13 pcepsi3 kernel: st0: Density 1b, tape length: 0, drv buffer: 1
Mar 16 16:44:13 pcepsi3 kernel: st0: Block size: 0, buffer size: 524288 (1 blocks).
Mar 16 16:44:13 pcepsi3 kernel: st0: Write protected
Mar 16 16:44:13 pcepsi3 kernel: st0: Setting block size to 262144 bytes.

(command: mt -t /dev/nst0 rewind --->)
Mar 16 16:44:46 pcepsi3 kernel: st0: Block limits 2 - 16777214 bytes.
Mar 16 16:44:46 pcepsi3 kernel: st0: Mode sense. Length 11, medium 85, WBS 90, BLL 8
Mar 16 16:44:46 pcepsi3 kernel: st0: Density 1b, tape length: 0, drv buffer: 1
Mar 16 16:44:46 pcepsi3 kernel: st0: Block size: 262144, buffer size: 524288 (1 blocks).
Mar 16 16:44:46 pcepsi3 kernel: st0: Write protected
Mar 16 16:44:46 pcepsi3 kernel: st0: Rewinding tape.

(command: mt -t /dev/nst0 fsf 1 --->)
Mar 16 16:44:50 pcepsi3 kernel: st0: Block limits 2 - 16777214 bytes.
Mar 16 16:44:50 pcepsi3 kernel: st0: Mode sense. Length 11, medium 85, WBS 90,BLL 8
Mar 16 16:44:50 pcepsi3 kernel: st0: Density 1b, tape length: 0, drv buffer: 1
Mar 16 16:44:50 pcepsi3 kernel: st0: Block size: 262144, buffer size: 524288 (2 blocks).
Mar 16 16:44:50 pcepsi3 kernel: st0: Write protected
Mar 16 16:44:50 pcepsi3 kernel: st0: Spacing tape forward over 1 filemarks.

(command: dd if=/dev/nst0 of=... bs=262144 --->)
Mar 16 16:45:52 pcepsi3 kernel: st0: Block limits 2 - 16777214 bytes.
Mar 16 16:45:52 pcepsi3 kernel: st0: Mode sense. Length 11, medium 85, WBS 90, BLL 8
Mar 16 16:45:52 pcepsi3 kernel: st0: Density 1b, tape length: 0, drv buffer: 1
Mar 16 16:45:52 pcepsi3 kernel: st0: Block size: 262144, buffer size: 524288 (2 blocks).
Mar 16 16:45:52 pcepsi3 kernel: st0: Write protected
Mar 16 16:45:52 pcepsi3 kernel: st0: EOF/EOM flag up (2). Bytes 0
Mar 16 16:45:52 pcepsi3 kernel: st0: EOF up (2). Left 524288, needed 262144.
(reading & writing on disk ~300Mb of blocks until the last one in the file ...)
Mar 16 16:47:19 pcepsi3 kernel: (scsi0:0:0:-1) Unexpected busfree, LASTPHASE = 0xa0, SEQADDR = 0x15d
Mar 16 17:02:19 pcepsi3 kernel: scsi : aborting command due to timeout : pid43360, 
                                       scsi0, channel 0, id 0, lun 0 Read (6) 01 00 00 02 00 
Mar 16 17:02:19 pcepsi3 kernel: (scsi0:0:0:-1) Unexpected busfree, LASTPHASE = 0xa0, SEQADDR = 0x15d

Any suggestion ?
Many thanks and sorry again.

Gianmaria Collazuol, Ph.D. student
Phisics Department, Universita` di Firenze (Italy) and
NA48/EPSI Experiment, CERN (Switzerland). 








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