From owner-freebsd-questions@freebsd.org Wed Sep 16 05:54:44 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 675263EF38E for ; Wed, 16 Sep 2020 05:54:44 +0000 (UTC) (envelope-from 4250.82.1d4c400021bfbfa.c10732eb3773098d559db367ece2bd8e@email-od.com) Received: from s1-b0c6.socketlabs.email-od.com (s1-b0c6.socketlabs.email-od.com [142.0.176.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4Brq770VyDz4G7h for ; Wed, 16 Sep 2020 05:54:42 +0000 (UTC) (envelope-from 4250.82.1d4c400021bfbfa.c10732eb3773098d559db367ece2bd8e@email-od.com) DKIM-Signature: v=1; a=rsa-sha256; d=email-od.com;i=@email-od.com;s=dkim; c=relaxed/relaxed; q=dns/txt; t=1600235683; x=1602827683; h=content-transfer-encoding:content-type:mime-version:references:in-reply-to:message-id:subject:to:from:date:x-thread-info; bh=HsgNvlLmCqcOJDuzmyHTUhVCkPZWqeoUQXC/gdBFC9k=; b=XUUp4P7qS8ysqq6bTJ6nfrtjK9wQQBLcCtmRtSQ6Da6+HmnAMYOETrphYqBahfuLOVIHe3UKrTl5YGIvJBmaZ6BOivnG+HFJBB+nAZo0DLldjiNsvdY3yLbbDIj5cyY0VhIsEq8uFFuqlr9txAqhDAW7E15Zgi8/xZPeIySEIWg= X-Thread-Info: NDI1MC45Mi4xZDRjNDAwMDIxYmZiZmEuZnJlZWJzZC1xdWVzdGlvbnM9ZnJlZWJzZC5vcmc= Received: from r2.us-east-1.aws.in.socketlabs.com (r2.us-east-1.aws.in.socketlabs.com [142.0.191.2]) by mxsg2.email-od.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Wed, 16 Sep 2020 01:54:34 -0400 Received: from smtp.lan.sohara.org (EMTPY [185.202.17.215]) by r2.us-east-1.aws.in.socketlabs.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Wed, 16 Sep 2020 01:54:34 -0400 Received: from [192.168.63.1] (helo=steve.lan.sohara.org) by smtp.lan.sohara.org with smtp (Exim 4.94 (FreeBSD)) (envelope-from ) id 1kIQOn-000Gd0-0q for freebsd-questions@freebsd.org; Wed, 16 Sep 2020 06:54:33 +0100 Date: Wed, 16 Sep 2020 06:54:32 +0100 From: Steve O'Hara-Smith To: freebsd-questions@freebsd.org Subject: Re: partitioning server with 2 hard drives Message-Id: <20200916065432.508e19c3b9b5c0e44a72da3f@sohara.org> In-Reply-To: References: <20200915231901.e767350415aad298732f72cc@sohara.org> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.32; amd64-portbld-freebsd12.0) X-Clacks-Overhead: "GNU Terry Pratchett" Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4Brq770VyDz4G7h X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=email-od.com header.s=dkim header.b=XUUp4P7q; dmarc=none; spf=pass (mx1.freebsd.org: domain of 4250.82.1d4c400021bfbfa.c10732eb3773098d559db367ece2bd8e@email-od.com designates 142.0.176.198 as permitted sender) smtp.mailfrom=4250.82.1d4c400021bfbfa.c10732eb3773098d559db367ece2bd8e@email-od.com X-Spamd-Result: default: False [-2.17 / 15.00]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[email-od.com:s=dkim]; NEURAL_HAM_MEDIUM(-0.99)[-0.992]; FROM_HAS_DN(0.00)[]; RWL_MAILSPIKE_GOOD(0.00)[142.0.176.198:from]; MV_CASE(0.50)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[sohara.org]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.02)[-1.019]; RCVD_COUNT_THREE(0.00)[4]; R_SPF_ALLOW(-0.20)[+ip4:142.0.176.0/20]; DKIM_TRACE(0.00)[email-od.com:+]; NEURAL_HAM_SHORT(-0.46)[-0.460]; FORGED_SENDER(0.30)[steve@sohara.org,4250.82.1d4c400021bfbfa.c10732eb3773098d559db367ece2bd8e@email-od.com]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:7381, ipnet:142.0.176.0/22, country:US]; FROM_NEQ_ENVFROM(0.00)[steve@sohara.org,4250.82.1d4c400021bfbfa.c10732eb3773098d559db367ece2bd8e@email-od.com]; MAILMAN_DEST(0.00)[freebsd-questions] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Sep 2020 05:54:44 -0000 On Tue, 15 Sep 2020 16:10:05 -0700 Michael Sierchio wrote: > On Tue, Sep 15, 2020 at 3:19 PM Steve O'Hara-Smith > wrote: > > > > > > > I would go for a ZFS mirror using the rest of the drives, set up > > a weekly scrub and never worry about a drive failure again. > > > > When, not if, a drive fails, will you find one with precisely the same > geometry / capacity to replace the failed drive and remirror? Can you do You don't need to, you just need one big enough, and 1TB drives are very easy to find. > so before the other drive fails (which might be statistically likely)? Unless you do something daft like RMA the drive and wait then yes IME. > There are good online MMTDL, MTTF, MTBF numbers for various raid levels > for ZFS. None would lead me to be so glib. Well OK there are no guarantees but a mirror is orders of magnitude better than a single drive. -- Steve O'Hara-Smith