On 04/07/2014 03:11 PM, Lockwood, Glenn wrote:
On Apr 7, 2014, at 11:53 AM, Prentice Bisbal <[email protected]>
wrote:
4. SSDs wearing out. Is that still a concern, or are lifespans getting better?I
think Jim Lux once did calculations on that list to show that with
wear-leveling and everything else, even if you wrote to an SSD constantly, it
would still outlive the average lifespan of a cluster.
As long as you use enterprise-grade SSDs (e.g., Intel's stuff) with
overprovisioning, the nand endurance shouldn't be an issue over the lifetime of
a cluster. We've used SSDs as our nodes' system disks for a few years now
(going on four with our oldest, 324-node production system), and there have
been no major problems. The major problems happened when we were using the
cheaper commodity SSDs. Don't give in to the temptation to save a few pennies
there.
Thanks for the info. Enterprise typically means MLC instead of SLC, right?
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