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 18DF8ECAAD5 for ; Mon, 12 Sep 2022 12:48:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229543AbiILMsR (ORCPT ); Mon, 12 Sep 2022 08:48:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53300 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229601AbiILMsQ (ORCPT ); Mon, 12 Sep 2022 08:48:16 -0400 Received: from hermes.turmel.org (hermes.turmel.org [IPv6:2604:180:f1::1e9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 75FBA13EAA for ; Mon, 12 Sep 2022 05:48:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=turmel.org; s=a; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:From:References:To :Subject:MIME-Version:Date:Message-ID:Sender:Reply-To:Cc:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=I2NDlYATpEud+jFTqmz73BGOGqAOtjfQd3gNKy5lKiI=; b=muBBacM3YQIYD2ckZOShporW1J tDzaYXuTCfA/UCpqI3tv6+r1e+qFbfaG6MD05yFos78027dIGhUtRRTTg5upPKszzOigMCXD7pgoB dAQXBW1KXcMthVJdBUYIZGnWCWT+oq1DXbCZpxNWyfHCQWPKoxqWXZIpzTetCtUPIYXKFlq1DiigD pJNLIysUooEW0nGbnlmdSa1BnledX+mn/sAwDChv4QeaUt4cBBNSQrFKHCQwYafzeql26II0xOwPl iC23eabdfu7p7qErQdoLDYpguhTp/Wzyv2Nw79DJrOrkkXOyIWsBhyrCJuDxkkFmrdEVStXccIera 1DdLwI7w==; Received: from 108-70-166-50.lightspeed.tukrga.sbcglobal.net ([108.70.166.50] helo=[192.168.20.123]) by hermes.turmel.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oXirF-0006Hl-Bn; Mon, 12 Sep 2022 12:48:13 +0000 Message-ID: Date: Mon, 12 Sep 2022 08:48:12 -0400 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0 Subject: Re: 3 way mirror Content-Language: en-US To: Wols Lists , Gandalf Corvotempesta , Linux RAID Mailing List References: <73143dc1-e259-9dd1-d146-81d6c576b5d4@youngman.org.uk> <3e694d50-a636-3fc8-b662-0268f680c738@youngman.org.uk> From: Phil Turmel In-Reply-To: <3e694d50-a636-3fc8-b662-0268f680c738@youngman.org.uk> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org If you suffer a drive failure, your odds of a successful rebuild onto that spare are decidedly mixed. https://marc.info/?l=linux-raid&m=139050322510249&w=2 On 9/12/22 04:06, Wols Lists wrote: > On 12/09/2022 01:58, Phil Turmel wrote: >> Hi Wol, >> >> On 9/11/22 06:08, Wols Lists wrote: >> >> [trim /] >> >>> old one is still good I'd go for a 3-disk raid-5 plus spare. That's >>> my current setup. >> >> Eww.  Don't do that.  Always convert raid5+spare to raid6. >> > At the moment the fourth drive is, in my mind, a transient backup. I > don't want to make it an actual part of the array in case I want to > remove it. > > I'm thinking of getting a second matching drive, but seeing as I've > bought 16TB of drive space in the recentish past, another 8TB seems > excessive :-) > > Cheers, > Wol