sa(4): removing device entry

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Hello,

I've got a 5.2.1 system with a Quantum DTL7000 tape drive. I'm using 
dump(1) to backup to the tape, and this generally works fine. However, 
on two occasions I have seen a problem like this:

Apr  2 00:42:01 isis kernel: (ahc0:A:6:0): Sending WDTR 1
Apr  2 00:42:01 isis kernel: (ahc0:A:6:0): Received WDTR 1 filtered to 1
Apr  2 00:42:01 isis kernel: ahc0: target 6 using 16bit transfers
Apr  2 00:42:01 isis kernel: (ahc0:A:6:0): Sending SDTR period 19, 
offset 8
Apr  2 00:42:01 isis kernel: (ahc0:A:6:0): Received SDTR period 19, 
offset 8
Apr  2 00:42:01 isis kernel: Filtered to period 19, offset 8
Apr  2 00:42:01 isis kernel: ahc0: target 6 synchronous at 10.0MHz, 
offset = 0x8
Apr  2 00:42:01 isis kernel: (sa0:ahc0:0:6:0): Retrying Command
Apr  2 01:08:36 isis kernel: (sa0:ahc0:0:6:0): Unexpected busfree in 
Data-out phase
Apr  2 01:08:36 isis kernel: SEQADDR == 0x73
Apr  2 01:08:36 isis kernel: (sa0:ahc0:0:6:0): Unexpected Bus Free
Apr  2 01:08:36 isis kernel: (sa0:ahc0:0:6:0): error 5
Apr  2 01:08:36 isis kernel: (sa0:ahc0:0:6:0): Retries Exausted
Apr  2 01:08:36 isis kernel: (sa0:ahc0:0:6:0): lost device
Apr  2 01:08:36 isis kernel: (pass0:ahc0:0:6:0): lost device
Apr  2 01:08:36 isis kernel: (pass0:ahc0:0:6:0): removing device entry
Apr  2 01:08:36 isis kernel: ahc0: target 6 using 8bit transfers
Apr  2 01:08:36 isis kernel: ahc0: target 6 using asynchronous transfers
Apr  2 01:08:36 isis kernel: (sa0:ahc0:0:6:0): failed to write 
terminating filemark(s)
Apr  2 01:08:37 isis kernel: (sa0:ahc0:0:6:0): tape is now frozen- use 
an OFFLINE, REWIND or MTEOM command to clear this state.
Apr  2 01:08:37 isis kernel: (sa0:ahc0:0:6:0): removing device entry

Any ideas as to what the problem could be? After this happens, all *sa* 
devices disappear from /dev. Is there any way to recreate them, other 
than rebooting? If I eject the tape and insert a new one, the drive 
appears to load the tape normally, but I have no device entry to talk 
to it.

- --
Lachlan O'Dea
Computer Associates
Senior Software Engineer
tel: +61 3 8416 5627
fax: +61 3 8416 5810
mobile: +61 412 390 650
odela01_at_ca.com

Relax and enjoy your shoes!
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