Date: Thu, 26 Mar 2020 09:14:32 +0000 From: Arthur Chance <freebsd@qeng-ho.org> To: David Christensen <dpchrist@holgerdanske.com>, freebsd-questions@freebsd.org Subject: Re: drive selection for disk arrays Message-ID: <24b684fe-35c4-5959-b02a-7c3ac1df3477@qeng-ho.org> In-Reply-To: <713db821-8f69-b41a-75b7-a412a0824c43@holgerdanske.com> References: <20200325081814.GK35528@mithril.foucry.net> <713db821-8f69-b41a-75b7-a412a0824c43@holgerdanske.com>
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On 25/03/2020 22:19, David Christensen wrote: > 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? Not at exactly the same time, but the first time I ever built a zraid array, shortly after zfs was first released, I used a batch of four identical disks. About 5-6 years later they all failed over a period of about 2-3 months. There was long enough between failures to buy a replacement drive on next day delivery and recover, but this was on a home file server, not a heavily loaded system. Nowadays I buy from a couple of manufacturers based on Backblaze's latest statistics. -- Violets are red And roses are blue When metamaterials Alter their hue.
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