On 4/7/14 12:11 PM, "Lockwood, Glenn" <[email protected]> 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.
>
Was it wear out, or some other failure mode?
And if wear out, was it because consumer SSDs have lame leveling or
something like that?
>
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