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 C8B5CECAAD3 for ; Sun, 11 Sep 2022 12:21:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230208AbiIKMVC (ORCPT ); Sun, 11 Sep 2022 08:21:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230116AbiIKMVB (ORCPT ); Sun, 11 Sep 2022 08:21:01 -0400 Received: from mail.thelounge.net (mail.thelounge.net [91.118.73.15]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9623930F67 for ; Sun, 11 Sep 2022 05:20:56 -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 4MQTN63jmWzXLX; Sun, 11 Sep 2022 14:20:54 +0200 (CEST) Message-ID: Date: Sun, 11 Sep 2022 14:20:54 +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: Gandalf Corvotempesta Cc: Linux RAID Mailing List References: <53f5754d-e3e2-a8ba-bedb-07eb2b594595@thelounge.net> From: Reindl Harald Organization: the lounge interactive design In-Reply-To: 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 11.09.22 um 13:35 schrieb Gandalf Corvotempesta: > Il giorno dom 11 set 2022 alle ore 12:52 Reindl Harald > ha scritto: >> just throw it out of the array - on a RAID 1 with two disk you have >> still redundancy and i won't trust a disk which recognized that it has >> errors on it's own > > Why ? if it's just a single sector, the rest of the disk could be used > properly until the replacement. i simply don't trust drives which have thrown errors you don't lose anything when you push it out of the array >> what's the point of "can i delay" when you have no other options? :-) > > The option is: i've ordered the new disk, it should arrive this thursday. > If i'm still on the safe side, i'll wait, if not, i'll replace with > the first disk I have here, even if slower you are clearly on the safe side with 3 mirrors and every rebuild wears out the remaining drives, 1 out of the 3 would be enough since they hold identical data ---------------------- the only thing one should think of: are all 3 drives identical types with identical age - then it's more likely that they fail all within a short time that's why i try to mix different disks in a mirror to avoid failing both sides of a mirror due firmware-error or a charge of bad disks ---------------------- as i replaced my HDD to SSD i removed two drives out of my RAID10, as it didn't boot exchange two of them so at that point 1 mirror of each stripe was a HDD and one a new SSD, after one year i replaced the remaining two disks 2 x 850 EVO 2TB 2 x 860 EVO 2TB /dev/sda: GB Written: 72.020 /dev/sdb: GB Written: 69.709 /dev/sdc: GB Written: 91.367 /dev/sdd: GB Written: 94.134 pretty impossible that both sides of the same mirror will fail within a few hours