Date: Mon, 29 Sep 1997 10:36:51 -0700 From: Julian Elischer <julian@whistle.com> To: ip@mcc.ac.uk Cc: questions@FreeBSD.ORG Subject: Re: SCSI: what's a "deferred error"? Message-ID: <342FE733.237C228A@whistle.com> References: <199709291409.PAA10890@albatross.mcc.ac.uk>
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Ian Pallfreeman wrote: > > I'm getting a heap of these: > > sd0(ncr0:0:0): Deferred Error: MEDIUM ERROR > info:0x806b asc:14,1 Record not found field > replaceable unit: 1 > > and was wondering what exactly the error is. > A defered error is one that the drive discovers AFTER it's already told the requesting host that a command has completed.. this sounds like the drive is doing write -behind caching, and has already told you that the sector is written to disk when it discoveres that the sector ID field is bad. The deferred error is reported at the next command request by the host. (which of course uses up one of the retries :) > I've got bad block remapping enabled in the drive, and it's been reformatted > once already. Bad drive, naughty drive, drive go beddy-byes in the bin, I > suspect. > I THINK the SCSI spec says that this should have been done anyhow, in the case of write-behind stuff but... > Not a terribly important question, I'm just trying to satisfy my curiosity. > > TIA, > > Ian. > -- > Network Unit, SNOT Team, Manchester Computing, The University, Manchester, UK. > mail: ip@mcc.ac.uk | phone: +44-161-275-6006 | fax: +44-161-275-6040 > Where once we had dragons to slay, now we just sacrifice chickens. > 28,000 users, 155Mb/s networking, and a 486. :-(
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