Date: Mon, 15 Jun 1998 10:41:07 -0700 (PDT) From: Julian Elischer <julian@whistle.com> To: Cliff Addy <fbsdlist@federation.addy.com> Cc: questions@FreeBSD.ORG Subject: Re: SOLVED: SCSI tape problems Message-ID: <Pine.BSF.3.95.980615103932.7513C-100000@current1.whistle.com> In-Reply-To: <Pine.BSF.3.95q.980615100537.9486B-100000@federation.addy.com>
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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
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