Date: Wed, 25 Mar 2020 15:19:35 -0700 From: David Christensen <dpchrist@holgerdanske.com> To: freebsd-questions@freebsd.org Subject: drive selection for disk arrays Message-ID: <713db821-8f69-b41a-75b7-a412a0824c43@holgerdanske.com> In-Reply-To: <20200325081814.GK35528@mithril.foucry.net> References: <20200325081814.GK35528@mithril.foucry.net>
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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
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