From owner-freebsd-questions Mon Jun 15 10:47:08 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id KAA24186 for freebsd-questions-outgoing; Mon, 15 Jun 1998 10:47:08 -0700 (PDT) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from alpo.whistle.com (alpo.whistle.com [207.76.204.38]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id KAA24172 for ; Mon, 15 Jun 1998 10:46:52 -0700 (PDT) (envelope-from julian@whistle.com) Received: (from daemon@localhost) by alpo.whistle.com (8.8.5/8.8.5) id KAA14846; Mon, 15 Jun 1998 10:41:22 -0700 (PDT) Received: from current1.whistle.com(207.76.205.22) via SMTP by alpo.whistle.com, id smtpd014838; Mon Jun 15 17:41:19 1998 Date: Mon, 15 Jun 1998 10:41:07 -0700 (PDT) From: Julian Elischer To: Cliff Addy cc: questions@FreeBSD.ORG Subject: Re: SOLVED: SCSI tape problems In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Ometimes a disk drive can hit a bad block that is partially bad. then ite does a lot of retries.. this makes the server end eventually time out. the ahc driver (among others) then does a SCSI bus reset. The tape drive wouldn't like that very much.. On Mon, 15 Jun 1998, Cliff Addy wrote: > As some of you may recall, I've been having a long-running battle with > scsi bus timeouts while backing up to tape, every since we upgraded to > 2.1.7(?). Finally, after about a year, the problem seems to be solved. It > actually involves two things. > > 1) Changed tapes from Sony to Exabyte. The Exabyte tapes cost about 50% > more, but made about 80% of the problems go away. > > 2) Scanned the DISK DRIVES for bad blocks. Kinda bizarre that bad blocks > on the disks caused tape drive error messages, but OK. Once the bad > blocks were remapped, we went to zero problems. Why the auto-remap didn't > work, I don't know. > > Ahhhh, after a year of aggrevation, my servers are back to the wonderfully > stable machines I remember. > > Cliff > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message