topic Re: Latency questions regarding 730 and 3710/3610/3510 in Solid State Drives (NAND)

Latency questions regarding 730 and 3710/3610/3510

ppara5 — Tue, 19 Jan 2016 16:35:43 GMT

The 730 product brief states: "Applications will benefit from the 50µs read latency." The 3x10 product brief states: "Applications benefit from 55µs typical latency with max read latencies of 500µs 99.9% of the time." No mention is made of max latencies in the 730 product brief.

http://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/ssd-730-series-brief.pdf http://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/ssd-730-series-brief.pdf

http://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/ssd-dc-s3x10-series-brief.pdf http://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/ssd-dc-s3x10-series-brief.pdf

I compare these two statements to the difference between WDC Black and enterprise drives where the former will finish a read/write regardless of the time it takes, but the latter will stop trying to access a file after a certain amount of time to keep RAID operations from halting. In other words, enterprise drives must not be substituted for desktop drives and probably vice versa.

Is the 3x10 product brief saying the same thing with its "max read latencies of 500µs 99.9% of the time" or is it simply stating the worst-case access?

Re: Latency questions regarding 730 and 3710/3610/3510

jbenavides — Tue, 19 Jan 2016 23:30:00 GMT

Hello paramountain,

As you mentioned, the maximum latency for the Intel® SSD 730 Series is not mentioned in the Product Specifications. This is the standard information for consumer SSD's since client computers are normally concerned with average response times, as they tolerate larger differences in the minimum and maximum latency of IO operations.

The Intel® SSD DC S3610 and S3710 have an advertised Maximum latency since they are Data Center drives. Enterprise SSD's must meet QOS levels and guarantee that all operations will be completed within a specific time limit, for this reason Enterprise storage devices normally test and advertise these values.

http://www.intel.com/content/www/us/en/solid-state-drives/ssd-730-series-spec.html Intel® Solid-State Drive 730 Series Specification

http://www.intel.com/content/www/us/en/solid-state-drives/ssd-dc-s3610-spec.html Intel® SSD Data Center S3610 Series Product Specification

http://www.intel.com/content/www/us/en/solid-state-drives/ssd-dc-s3710-spec.html Intel® SSD DC S3710 Series Specifications

Re: Latency questions regarding 730 and 3710/3610/3510

ppara5 — Wed, 20 Jan 2016 20:35:27 GMT

Thanks for the reply. It makes more sense now.