[9252] in linux-scsi channel archive
Re: concurrent commands to same LUN ?
daemon@ATHENA.MIT.EDU (Kurt Garloff)
Wed Jul 26 13:59:37 2000
Date: Wed, 26 Jul 2000 19:52:06 +0200
From: Kurt Garloff <garloff@suse.de>
To: Martin Peschke <peschke@fh-brandenburg.de>
Cc: linux-scsi@vger.rutgers.edu
Message-ID: <20000726195206.T32091@garloff.etpnet.phys.tue.nl>
Mail-Followup-To: Kurt Garloff <garloff@suse.de>,
Martin Peschke <peschke@fh-brandenburg.de>,
linux-scsi@vger.rutgers.edu
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In-Reply-To: <Pine.GSO.4.10.10007261055390.29305-100000@zeus.fh-brandenburg.de>; from peschke@fh-brandenburg.de on Wed, Jul 26, 2000 at 11:01:15AM +0200
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On Wed, Jul 26, 2000 at 11:01:15AM +0200, Martin Peschke wrote:
> Yes, that is the scenario I think of. Queued commands seems to be the
> right thing here. But which layer is responsible for determining
> whether a particular SCSI command should be queued to the SCSI device and
> which tag should be used? How does tagged queuing work in Linux?
mid leayer know how many commands your host-adapter can accept (cmd_per_lun)
and passes them to the driver with queue_command. The low-level driver does
all the tag handling.
Regards,
--=20
Kurt Garloff <garloff@suse.de> Eindhoven, NL
GPG key: See mail header, key servers Linux kernel development
SuSE GmbH, Nuernberg, FRG SCSI, Security
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