On 01/24/2018 11:41 AM, Andy Higginson wrote:
... I know that some people don't like this, however I work on the
basis that is there is an issue with a batch of drives, then you are
not going to get 2 to fail at about the same time. You have 3
companies to make your choice from - Seagate, Toshiba and WD, and all
of these will be from totally different factories so you shouldn't
come unstuck.
For what it's worth, the storage company Backblaze produces a quarterly
hard drive failure rate report that is publicly available. Backblaze
currently has over 400 petabytes (400,000 terabytes!) of online
storage. Their Q3 2017 report can be found at
https://www.backblaze.com/blog/hard-drive-failure-rates-q3-2017/
Also for what it's worth, my own experience is quite similar, in that I
mix manufacturers within arrays myself; I'm not alone, as $dayjob's EMC
Clariion arrays have mixed manufacturers within RAID groups (we have a
somewhat paltry 750TB of online storage at the moment, a drop in the
bucket compared to Backblaze). Most are ES-series Seagates, but there
are Hitachi and Toshiba drives in the array. Many have been spinning
for almost ten years with low error rates (the EMC FLARE software
proactively hot spares based on statistical data, so drives are
typically faulted and hotspared pre-failure, but we have had a couple of
dozen or so out of >300 drives hard fail in the past ten years).
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