Date: Tue, 27 Jun 2006 10:25:05 +0300 (EEST) From: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua> To: Paul Allen <nospam@ugcs.caltech.edu> Cc: "M.Hirsch" <webmaster@hirsch.it>, freebsd-stable@freebsd.org Subject: Re: FreeBSD 6.x CVSUP today crashes with zero load ... Message-ID: <20060627102111.I35218@atlantis.atlantis.dp.ua> In-Reply-To: <20060627004115.GA12597@groat.ugcs.caltech.edu> References: <20060626081029.L1114@ganymede.hub.org> <20060626140333.M38418@fledge.watson.org> <20060626235355.Q95667@atlantis.atlantis.dp.ua> <44A04FD2.1030001@hirsch.it> <20060627011512.N95667@atlantis.atlantis.dp.ua> <44A06233.1090704@hirsch.it> <20060627014335.E87535@atlantis.atlantis.dp.ua> <44A068A7.3090403@hirsch.it> <20060627020819.L3403@atlantis.atlantis.dp.ua> <44A06FFB.40104@hirsch.it> <20060627004115.GA12597@groat.ugcs.caltech.edu>
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On Mon, 26 Jun 2006, Paul Allen wrote: > The very originating purpose of ECC was to keep the computer going in the > face of an alpha particle strike. > > Alpha particles flip *single* bits. > > ECC was never intended to detect crummy, failing hardware: that's a use > people have shoe-horned it into, but for which it is not entirely suited. Well, correction is the last 'C' in ECC. Don't forget about second (and more significant): Check. Error Check actually detects failing memory chips (structure of the correcting code ensures detection of every 2-bit failure and most N-bit (N>2)). Sincerely, Dmitry -- Atlantis ISP, System Administrator e-mail: dmitry@atlantis.dp.ua nic-hdl: LYNX-RIPE
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