[7970] in linux-scsi channel archive
Re: Another multi-lun CD changer (was: ... simultaneous access problem)
daemon@ATHENA.MIT.EDU (Ishikawa)
Fri Jan 28 19:51:19 2000
Message-ID: <3891C586.21A9D2D9@yk.rim.or.jp>
Date: Sat, 29 Jan 2000 01:36:22 +0900
From: Ishikawa <ishikawa@yk.rim.or.jp>
MIME-Version: 1.0
To: Eric Youngdale <eric@andante.org>, Kurt Garloff <garloff@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
LINUX SCSI <linux-scsi@vger.rutgers.edu>
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Hi,
I tried the Nakamich MBR-7 CD changer again with tmscsim driver.
There are two parameters that looked promising for the tmscsim driver.
SelTimeout, and DelayReset
This time I tried to increase seltimeout, but it could be increased only
to 401msec.
(I wonder what crossed the Nakamichi designers when they realized
their reader mechanism takes longer than 400msec when two CDs
are switched. Maybe, they thought nobody would do this under
DOS and win3.1 quick enought...)
Increasing DelayReset didn't help either.
Apparently during the duration of the N seconds specified
for DelayReset, the keyboard input or mouse input is not
handled well. So increasing DelayReset to 5 seconds actually
would make it difficult to kill the stuck "ls -lR" processes since
the reset seems to be repeated.
This is what I found today.
At least, I could narrow down the problem area, I hope.
Happy Hacking,
Chiaki Ishikawa
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