From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Bottomley Subject: RE: queue depth help!! Date: 31 Dec 2003 10:26:56 -0600 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <1072888017.1893.2.camel@mulgrave> References: <3FF4A594@webmail.colostate.edu> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from stat1.steeleye.com ([65.114.3.130]:11733 "EHLO hancock.sc.steeleye.com") by vger.kernel.org with ESMTP id S265196AbTLaQ1F (ORCPT ); Wed, 31 Dec 2003 11:27:05 -0500 In-Reply-To: <3FF4A594@webmail.colostate.edu> List-Id: linux-scsi@vger.kernel.org To: jshankar Cc: linux-scsi On Wed, 2003-12-31 at 10:23, jshankar wrote: > On issuing a scsi command write, does the data needs to be written > succesfully > to disk before issuing a scsi response. Is there a chance that the previous > command's data is still cached on scsi controller and the next command issued > is executed. That depends on the drive cache setting. For a write back cache, no--status will be sent before the command reaches the medium (as long as the FUA bit isn't set); for all other cache settings, yes. > Please let me know if there are any good tools for scsi analyzer. I don't actually have one of these, so I'll let others answer... James