Date: Fri, 31 Oct 2008 17:36:08 +0000 From: Thomas Sparrevohn <Thomas.Sparrevohn@btinternet.com> To: freebsd-questions@freebsd.org Cc: Carl <k0802647@telus.net>, Jeremy Chadwick <koitsu@freebsd.org> Subject: Re: gmirror slice insertion, "FAILURE - READ_DMA status=51<READY, DSC, ERROR>" Message-ID: <200810311736.09706.Thomas.Sparrevohn@btinternet.com> In-Reply-To: <20081029100439.GA73714@icarus.home.lan> References: <49067148.6080307@telus.net> <49082625.7080804@telus.net> <20081029100439.GA73714@icarus.home.lan>
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On Wednesday 29 October 2008 10:04:39 Jeremy Chadwick wrote: > On Wed, Oct 29, 2008 at 02:00:21AM -0700, Carl wrote: > > Jeremy Chadwick wrote: > >> Seagate chooses to encode some raw data for some SMART attributes in a > >> custom format. The format is not publicly documented. This is why you > >> have to go off of the adjusted values shown in VALUE/WORST/THRESH. > >> "How am I supposed to know all of this?!" You aren't -- it comes with > >> experience. > > > > And yet my failing drive's VALUE numbers are still all above their > > THRESH values, despite it being bad enough to cripple the system. One > > might argue those threshold values leave something to be desired. > > I'd urge you to file complaint(s) with drive manufacturers, as they're > the ones who decide the values. Thresholds are not defined per the > ATA-ATAPI specification, so technically they can pick whatever value > they want. This is exactly why you'll encounter people screaming "SMART > is worthless, the drive is already dead by the time the overall SMART > health check fails!" > > If you go this route, please CC me, as I'd be quite to see what > manufacturers have to say. > Just a saw note - I saw the same problem with a hitachi disk - I ran a vendor diagnostics tool that I found on their home page and it rebuild the bad sector map and the problem went away The error occured after I had the disk for a couple of days - WHat puzzled me was that the drive did not do it automatically
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