Re: Reliability with RAID 10 SSD and Streaming Replication

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On 5/22/13 3:51 PM, Merlin Moncure wrote:
s3700 is rated for 10 drive writes/day for 5 years. so, for 200gb drive, that's
200gb * 10/day * 365 days * 5, that's 3.65 million gigabytes or ~ 3.5 petabytes.

Yes, they've improved on the 1.5PB that the 710 drives topped out at. For that particular drive, this is unlikely to be a problem. But I'm not willing to toss out longevity issues at therefore irrelevant in all cases. Some flash still costs a lot more than Intel's SSDs do, like the FusionIO products. Chop even a few percent of the wear out of the price tag on a RAMSAN and you've saved some real money.

And there are some other products with interesting price/performance/capacity combinations that are also sensitive to wearout. Seagate's hybrid drives have turned interesting now that they cache writes safely for example. There's no cheaper way to get 1TB with flash write speeds for small commits than that drive right now. (Test results on that drive coming soon, along with my full DC S3700 review)

btw,  cost/pb of this drive is less than half of
the 710 (which IMO was obsolete the day the s3700 hit the street).

You bet, and I haven't recommended anyone buy a 710 since the announcement. However, "hit the street" is still an issue. No one has been able to keep DC S3700 drives in stock very well yet. It took me three tries through Newegg before my S3700 drive actually shipped.

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Greg Smith   2ndQuadrant US    greg@xxxxxxxxxxxxxxx   Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.com


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