From owner-freebsd-stable@FreeBSD.ORG Tue Aug 24 19:51:54 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2F97E1065679 for ; Tue, 24 Aug 2010 19:51:54 +0000 (UTC) (envelope-from artemb@gmail.com) Received: from mail-qw0-f54.google.com (mail-qw0-f54.google.com [209.85.216.54]) by mx1.freebsd.org (Postfix) with ESMTP id D4EFE8FC15 for ; Tue, 24 Aug 2010 19:51:53 +0000 (UTC) Received: by qwg5 with SMTP id 5so7220886qwg.13 for ; Tue, 24 Aug 2010 12:51:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:cc:content-type:content-transfer-encoding; bh=4iuStYGtR/63Eh3eHk6Kz4H0BtaQHnd4yv8ktT8Ug1c=; b=R7Oz6SdIUx7c5i4wUlCEw0l0ToO4vK8zC00To4UBQkEE31SK4vFqnfH/WMfGKnrdrl 22yZIJQS6ZPWBTxfCRC0JU30w+Qj/leGKuYAEqIMxfLS7+Fzd9WRyuU6BaDMkanBMlfD 4Gm8LlQHURteEwiHovWXLRC3NCF3//+NTPfKw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=q6czjGWJ4XADufXv2ugHQWrebChEHT5v4Ov/SXIt2SSEqD+DAVYfJWFJTwj0xDNZeJ b41kEvpBIJyqR95DQfArphpWJtCp6ysR4y1ik52BlYrfG9UbQ15JuaOGeNaoMzKHv5AO KB3FBgynu8EJTERqHU2w5wFg/aAk44yduU4YU= MIME-Version: 1.0 Received: by 10.220.179.7 with SMTP id bo7mr2223684vcb.2.1282679476138; Tue, 24 Aug 2010 12:51:16 -0700 (PDT) Sender: artemb@gmail.com Received: by 10.220.49.70 with HTTP; Tue, 24 Aug 2010 12:51:15 -0700 (PDT) In-Reply-To: <4C737F85.5010804@icyb.net.ua> References: <4C71CC62.6060803@langille.org> <4C71D756.5080205@langille.org> <4C7218D6.6090408@icyb.net.ua> <201008230820.35260.jhb@freebsd.org> <4C737F85.5010804@icyb.net.ua> Date: Tue, 24 Aug 2010 12:51:15 -0700 X-Google-Sender-Auth: vd3EuMZ9CF6sjntF5fOY9Ek9V7k Message-ID: From: Artem Belevich To: Andriy Gapon Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Ronald Klop , freebsd-stable@freebsd.org Subject: Re: kernel MCA messages X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Aug 2010 19:51:54 -0000 IMHO the key here is whether hardware is broken or not. The only case where correctable ECC errors are OK is when a bit gets flipped by a high-energy particle. That's a normal but fairly rare event. If you get bit flips often enough that you can recall details of more then one of them on the same hardware, my guess would be that you're dealing with something else -- bad/marginal memory, signal integrity issues, power issues, overheating... The list continues.. In all those cases hardware does *not* work correctly. Whether you can (or want to) keep running stuff on the hardware that is broken is another question. --Artem On Tue, Aug 24, 2010 at 1:15 AM, Andriy Gapon wrote: > on 24/08/2010 09:14 Ronald Klop said the following: >> >> A little off topic, but what is 'a low rate of corrected ECC errors'? At= work >> one machine has them like ones per day, but runs ok. Is ones per day muc= h? > > That's up to your judgment. =A0It's like after how many remapped sectors = do you > replace HDD. > You may find this interesting: > http://www.cs.toronto.edu/~bianca/papers/sigmetrics09.pdf > > -- > Andriy Gapon > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >