[6863] in linux-scsi channel archive
Problem using "scsi add-single-device" >/proc/scsi/scsi
daemon@ATHENA.MIT.EDU (D. Lance Robinson)
Wed Jul 21 15:28:03 1999
Date: Wed, 21 Jul 1999 11:46:53 -0700
From: "D. Lance Robinson" <lancer@airways.com>
Reply-To: lancer@airways.com
To: linux-scsi <linux-scsi@vger.rutgers.edu>,
Gerard Roudier <groudier@club-internet.fr>
Hi Gerard & others,
Using a Symbios/LSI 53c895 chip and the sym53c8xx driver, I am trying to
scan the bus for newly added devices using the
echo "scsi add-single-device 0 0 id 0 " >/proc/scsi/scsi
technique. This generally works on an idle bus (doesn't always see a
device), but bad things happen when there is activity on the bus when
the 'add' command is issued. A bus reset get generated when a device
reselects the bus. And this can happen several times when trying to
'add' (probe) a non-existant device.
Here is a scenario of what is happening (with the help of a SCSI
analyzer.)
1) One or more commands get queued up in device X.
2) The 'add-single-device' command is issued for non-existant device Y.
3) Exactly what happens now is a bit fuzzy
4) Device X reselects the host, and sends the 0x80 Identify message
5) The SCSI Bus is RESET.
6) Loops back to 4 for zero or more times
NOTE: I am using Seagate Barracuda devices (ST39102LC) and this is on a
PowerPC system.
Any ideas ?
<>< Lance.
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