[794] in linux-scsi channel archive
Re: SCSI scanner project
daemon@ATHENA.MIT.EDU (Drew Eckhardt)
Fri Nov 10 00:59:23 1995
To: Kenneth Stailey <kstailey@owl.dol-esa.gov>
cc: johnsonm@nigel.vnet.net, linux-scsi@vger.rutgers.edu
In-reply-to: Your message of "Thu, 09 Nov 1995 15:38:08 EST."
<199511092038.PAA02298@owl.dol-esa.gov>
Date: Thu, 09 Nov 1995 13:53:47 -0700
From: Drew Eckhardt <drew@poohsticks.org>
In message <199511092038.PAA02298@owl.dol-esa.gov>, kstailey@owl.dol-esa.gov wr
ites:
>> Many of the slow (Sequential access rewind, retension, file space
>> forward and reverse; direct access format) SCSI commands have an
>> IMMEDIATE bit, where if set the device returns COMMAND COMPLETE
>> real soon.
>
>Ahh, so the behavior is not that aberrant after all. It just violates
>the spec in that there is no IMMEDIATE bit for the OBJECT_POSITION
>0x31 and START_SCAN 0x1b commands. At least not according to _The
>SCSI Bus and IDE Interface_ by Friedhelm Schmidt ISBN 0-201-42284-0.
There's nothing in the spec which precludes a device from being
unavailable for operations at any time...
