From owner-freebsd-scsi  Tue Jul 14 21:42:09 1998
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From: dan@math.berkeley.edu (Dan Strick)
Message-Id: <199807150441.VAA02653@math.berkeley.edu>
To: semen@iclub.nsu.ru
Subject: Re:  About to reset single device on SCSI bus
Cc: dan@math.berkeley.edu, freebsd-scsi@FreeBSD.ORG
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> Does anybody know how to reinitialize SCSI device without
> reinitialization of all bus? The problem is that SDT-7000
> (DDS-2 Tape) somehow gets in stupid mode, when it works with 
> the speed of 15-20 Kb/s, else in doesn't whant to read tapes
> written in normal state and etc. But after reset the computer,
> it works just fine. So I think Subject can help me to avoid
> reboot and to get SDT-7000 in normal state.

I don't see an option to the scsi(8) command that does this.

There is an SCIOCRESET ioctl() that might might apply to a
single device.  There is a SCSI message for resetting a single
device, but I don't if this ioctl() actually sends it or if
it is likely to work.  I assume it is worth a try.
You might have to open the ".ctl" device to make this work.

I have a program that will do this, but it just keeps saying
"SCIOCRESET: Inappropriate ioctl for device" which I think
offhand is error ENOTTY.  I have not scoured the kernel
scsi device drivers to determine what they really want
from me.

Dan Strick
dan@math.berkeley.edu

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