Date: Tue, 27 Jun 2006 02:21:28 +0300 (EEST) From: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua> To: "M.Hirsch" <webmaster@hirsch.it> Cc: freebsd-stable@freebsd.org Subject: Re: FreeBSD 6.x CVSUP today crashes with zero load ... Message-ID: <20060627020819.L3403@atlantis.atlantis.dp.ua> In-Reply-To: <44A068A7.3090403@hirsch.it> References: <E1FuYsL-000HT3-H2@dilbert.firstcallgroup.co.uk> <20060626100949.G24406@fledge.watson.org> <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>
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On Tue, 27 Jun 2006, M.Hirsch wrote: >> If you're using hardware w/o ECC, it just can't tell whether error present >> or absent. So ECC _is_ the way to detect (not mask) broken hardware. >> > Ok, thanks. I think I understand the meaning of ECC now. > So, unlike my supplier claims, ECC is not supposed to help against hardware > failures. > But it is the way to detect them, right? ECC stands for Error Checking and Correction. It's a hardware feature, and its primary task is Checking (that is, detection) of errors. It just happens that number of additional bits which carry checking code is sufficient to correct _any_ _single-bit_ data error (not mask it, but really correct), and to detect any double-bit and most of several-bit errors (w/o correction). >> Intel's ECC-capable chipset allows it. But if we're speaking about >> production environment, such behaviour (abnormal termination on _corrected_ >> error) is unacceptable. > > "abnormal termination" is not only acceptable for me, it is what I am looking > for. > Make the node crash completely, so one of the others can take over its > task(s). Again, when single-bit correction has happened, it's not fake, the result is actually correct. Why panic the machine immediately if all data OK? Sincerely, Dmitry -- Atlantis ISP, System Administrator e-mail: dmitry@atlantis.dp.ua nic-hdl: LYNX-RIPE
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