On 5/22/13 11:05 AM, Merlin Moncure wrote:
unfortunately, I don't have a s3700 to test with, but based on everything i've seen it looks like it's a mostly solved problem. (for example, see here: http://www.storagereview.com/intel_ssd_dc_s3700_series_enterprise_ssd_review). Tests that drive the 710 to <3k iops were not able to take the 3700 down under 10k at any queue depth.
I have two weeks of real-world data from DC S3700 units in production and a pile of synthetic test results. The S3700 drives are at least 2X as fast as the 710 models, and there are synthetic tests where it's closer to 10X.
On a 5,000 IOPS workload that crushed a pair of 710 units, the new drives are only hitting 50% utilization now. Does that make worst-case 10K? Maybe. I can't just extrapolate from the 50% figures and predict the throughput I'll see at 100% though, so I'm still waiting for more data before I feel comfortable saying exactly what the worst case looks like.
-- Greg Smith 2ndQuadrant US greg@xxxxxxxxxxxxxxx Baltimore, MD PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.com -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
