From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Olien Subject: Re: Question about Request Sense case in scsi_lib.c Date: Tue, 12 Oct 2004 10:59:43 -0700 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <20041012175943.GB27526@osdl.org> References: <20041012000058.GA26569@osdl.org> <20041012165919.GA27526@osdl.org> <1097601199.2044.91.camel@mulgrave> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from fw.osdl.org ([65.172.181.6]:62389 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S266538AbUJLR7v (ORCPT ); Tue, 12 Oct 2004 13:59:51 -0400 Content-Disposition: inline In-Reply-To: <1097601199.2044.91.camel@mulgrave> List-Id: linux-scsi@vger.kernel.org To: James Bottomley Cc: Tim Pepper , SCSI Mailing List James, On Tue, Oct 12, 2004 at 12:13:13PM -0500, James Bottomley wrote: > > Hang on a minute ... if you're ping pong'ing the drives using AVT, those > transfers take time to achieve. The device is probably returning UNIT > ATTENTION, NOT_READY while the transfer is in progress. This is > probably the source of the requeue. OK, This probably makes sense. I'm going to see if I can get a theory of operations for this device somewhere. I'd like to have a better understanding of how the device works and how long it takes to do these transfers. > > As for the error, I still don't understand that, but it looks like > something went wrong in setting up or tearing down the dma mapping, so > that it was incorrectly described when this happened a second time. I'll dump out some more information about these cases, and see if we can analyze what's going on. > > James > Thanks! Dave