From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 93B23ECAAA1 for ; Mon, 12 Sep 2022 09:40:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229802AbiILJks (ORCPT ); Mon, 12 Sep 2022 05:40:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229496AbiILJkr (ORCPT ); Mon, 12 Sep 2022 05:40:47 -0400 Received: from mail.thelounge.net (mail.thelounge.net [91.118.73.15]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C4CD6342 for ; Mon, 12 Sep 2022 02:40:46 -0700 (PDT) Received: from [10.10.10.2] (rh.vpn.thelounge.net [10.10.10.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) (Authenticated sender: h.reindl@thelounge.net) by mail.thelounge.net (THELOUNGE MTA) with ESMTPSA id 4MR1mr1s9wzXLZ; Mon, 12 Sep 2022 11:40:44 +0200 (CEST) Message-ID: Date: Mon, 12 Sep 2022 11:40:43 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.1 Subject: Re: 3 way mirror Content-Language: en-US To: Roman Mamedov Cc: Wols Lists , Gandalf Corvotempesta , Linux RAID Mailing List References: <53f5754d-e3e2-a8ba-bedb-07eb2b594595@thelounge.net> <2bcebfce-6def-38f8-99be-1f5702905f94@youngman.org.uk> <20220912142624.63ba4b5c@nvm> From: Reindl Harald Organization: the lounge interactive design In-Reply-To: <20220912142624.63ba4b5c@nvm> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org Am 12.09.22 um 11:26 schrieb Roman Mamedov: > On Mon, 12 Sep 2022 10:16:55 +0200 > Reindl Harald wrote: > >>> That's called paranoia >> >> that's called common sense >> >>> ALL drives have hiccups when there's absolutely >>> nothing wrong with them. What are the manufacturer's error figures? >>> Expect at least one error every two or three complete passes of pretty >>> much every large big disk nowadays? >> i don't expect any SMART error at all and if one hits after years of >> uptime fine that the drive don't fail completly - but would i trust it? no! > > I have multiple drives (Hitachi) which have developed around 3 to 10 > reallocated sectors, and then just continue to work for years, not increasing > those further. Throwing them away would be uneconomical. better safe than sorry in the past 15 years i replaced 6 drives on 8 machines (each 4 disks) while some are running since 2011 on every location with machines i am resposible for is at least one replacment disk, switch, order a new reserve disk, case closed > Generally though, if you are way too concerned about individual drive failures, > it could be a sign that you do not have a robust enough backup scheme in place my backup scheme is perfect but my personal lifetime is much more worth than a disk costs these days - the backups are regulary testet and in the past 20 years i didn't need them which is a good thing no backup on this planet contains the last 30 minutes of work besides that outtakes typically happen in the moment where you have no time to deal with such events come on a restore a backup in a production environment, your customers will be not much thankful when they lose the last 30 minutes of all mails and work....