From owner-freebsd-hackers Fri Oct 6 15:48:23 1995 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.6.12/8.6.6) id PAA22663 for hackers-outgoing; Fri, 6 Oct 1995 15:48:23 -0700 Received: from aslan.cdrom.com (aslan.cdrom.com [192.216.223.142]) by freefall.freebsd.org (8.6.12/8.6.6) with ESMTP id PAA22651 for ; Fri, 6 Oct 1995 15:48:19 -0700 Received: from localhost.cdrom.com (localhost.cdrom.com [127.0.0.1]) by aslan.cdrom.com (8.6.12/8.6.9) with SMTP id PAA21783; Fri, 6 Oct 1995 15:47:26 -0700 Message-Id: <199510062247.PAA21783@aslan.cdrom.com> X-Authentication-Warning: aslan.cdrom.com: Host localhost.cdrom.com didn't use HELO protocol To: Terry Lambert cc: gibbs@freefall.freebsd.org (Justin T. Gibbs), dufault@hda.com, wilko@yedi.iaf.nl, henrich@crh.cl.msu.edu, freebsd-hackers@FreeBSD.ORG Subject: Re: 52gig RAID, causes panic In-reply-to: Your message of "Fri, 06 Oct 1995 15:44:49 PDT." <199510062244.PAA02482@phaeton.artisoft.com> Date: Fri, 06 Oct 1995 15:47:26 -0700 From: "Justin T. Gibbs" Sender: owner-hackers@FreeBSD.ORG Precedence: bulk >> >What is the interaction between LUN switching, Tagged Queuing, and SCSI >> >disconnect? >> > >> >I'd think it would be. uh, unpleasent. >> >> Why? LUN switching is exactly the same as switching targets. > >Assuming that completion can be sent. > >I think the way Lun switching works with a changer, you don't want >outstanding I/O's when the Lun is switched. 8-). Nope. Either the changer will queue the I/O for the other lun, or it will return BUSY status. >Might be the same for a RAID, depending on the actual electronics >(one would hope that it wasn't, though...). I highly doubt it. > Terry Lambert > terry@lambert.org >--- >Any opinions in this posting are my own and not those of my present >or previous employers. -- Justin T. Gibbs =========================================== Software Developer - Walnut Creek CDROM FreeBSD: Turning PCs into workstations ===========================================