From owner-freebsd-questions@freebsd.org Wed Mar 25 22:20:01 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 7C40D2650B0 for ; Wed, 25 Mar 2020 22:20:01 +0000 (UTC) (envelope-from dpchrist@holgerdanske.com) Received: from holgerdanske.com (holgerdanske.com [IPv6:2001:470:0:19b::b869:801b]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "holgerdanske.com", Issuer "holgerdanske.com" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 48njGc2CDFz3JJm for ; Wed, 25 Mar 2020 22:19:51 +0000 (UTC) (envelope-from dpchrist@holgerdanske.com) Received: from 99.100.19.101 ([99.100.19.101]) by holgerdanske.com with ESMTPSA (ECDHE-RSA-AES128-GCM-SHA256:TLSv1.2:Kx=ECDH:Au=RSA:Enc=AESGCM(128):Mac=AEAD) (SMTP-AUTH username dpchrist@holgerdanske.com, mechanism PLAIN) for ; Wed, 25 Mar 2020 15:19:35 -0700 Subject: drive selection for disk arrays References: <20200325081814.GK35528@mithril.foucry.net> To: freebsd-questions@freebsd.org From: David Christensen X-Forwarded-Message-Id: <20200325081814.GK35528@mithril.foucry.net> Message-ID: <713db821-8f69-b41a-75b7-a412a0824c43@holgerdanske.com> Date: Wed, 25 Mar 2020 15:19:35 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200325081814.GK35528@mithril.foucry.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 48njGc2CDFz3JJm X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of dpchrist@holgerdanske.com has no SPF policy when checking 2001:470:0:19b::b869:801b) smtp.mailfrom=dpchrist@holgerdanske.com X-Spamd-Result: default: False [-2.68 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; URIBL_BLOCKED(0.00)[backblaze.com.multi.uribl.com]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; IP_SCORE(-1.66)[ipnet: 2001:470::/32(-4.66), asn: 6939(-3.59), country: US(-0.05)]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; TO_DN_NONE(0.00)[]; AUTH_NA(1.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-0.98)[-0.981,0]; DMARC_NA(0.00)[holgerdanske.com]; NEURAL_HAM_MEDIUM(-0.94)[-0.944,0]; R_SPF_NA(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:6939, ipnet:2001:470::/32, country:US]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Mar 2020 22:20:01 -0000 Jacques Foucry wrote: > ALWAYS (when it's possible) buy and use disks from different brand > (mix seagate, WD, etc..) in order to avoid same series and same > MTBF. > > I know this to late in this case, but keep this in mind. > > I know this will not help in this case, please excuse my > intervention if it's inappropriate. To date, most of my arrays have been composed of similar drives. But, I run a SOHO LAN and have limited experience. I have been wondering about using dissimilar drives to prevent simultaneous common-mode failures. Backblaze publishes statistics for individual drives: https://www.backblaze.com/blog/hard-drive-stats-q2-2019/ I would be curious to read any data or reports comparing arrays of similar drives vs. arrays of dissimilar drives. Have anyone seen a failure involving multiple similar drives all failing in the same mode at the same time? David