From owner-freebsd-scsi Mon Mar 16 18:27:13 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id SAA23991 for freebsd-scsi-outgoing; Mon, 16 Mar 1998 18:27:13 -0800 (PST) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from sendero.simon-shapiro.org (sendero-fddi.Simon-Shapiro.ORG [206.190.148.2]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id SAA23942 for ; Mon, 16 Mar 1998 18:27:05 -0800 (PST) (envelope-from shimon@simon-shapiro.org) Received: (qmail 21198 invoked from network); 17 Mar 1998 02:34:26 -0000 Received: from localhost.simon-shapiro.org (HELO sendero-fxp0.simon-shapiro.org) (@127.0.0.1) by localhost.simon-shapiro.org with SMTP; 17 Mar 1998 02:34:26 -0000 Message-ID: X-Mailer: XFMail 1.3-alpha-031298 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <19980316154940.13918@mcs.net> Date: Mon, 16 Mar 1998 18:34:26 -0800 (PST) Reply-To: shimon@simon-shapiro.org Organization: The Simon Shapiro Foundation From: Simon Shapiro To: Karl Denninger Subject: Re: Any thought given to... Cc: scsi@FreeBSD.ORG Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On 16-Mar-98 Karl Denninger wrote: .. > Well, the place I got bit by it wasn't on the news machine (where its not > really all that big a deal). The "prophylactic" value is significant > though. If you get an error on an I/O request there is simply no reason > to > barf the *rest* of the queued I/O! That's what was going on - it wasn't > the > single request that got hosed without being retried, but literally > everything in the chain that hadn't yet made it to the RAID controller > that > was being aborted. That can be a *lot* of data; if you're unlucky you > end > up with a system that won't fsck when it comes back up. This may be a virtue of the Host Adaptor you are using. I saw some of this stuff early, but the current DPT driver rarely, if ever, exhibits that. The reasons are many and nasty, but they are there. Simon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message