ADVANCED WRITE TESTING
As we talked about in our Micron P400m SSD Review, SSDs have different performance states. Since the Intel SSD DC S3500 is an enterprise SSD, we will focus on steady state performance.
With the following tests, we stressed the drive using random 4KB write workloads across the entire span for at least 24 hours. This is more than enough to achieve steady state. The following graph is showing the latency and IOPS across an 11 hour span.
Normally, when we look at latency and IOPS averaged in one minute intervals, we are trying to see if there are any trends that we need to examine closer. When we first compile the data, our graphs automatically scale and we see ranges of multiple milliseconds. We we first looked at the latency for the SSD800MM, we weren’t that impressed, until we looked at the scale. Our one minute averages, across 11 hours, varied by less than 6 microseconds. So after all of this, we did find a trend, which was rock-solid performance. But, before we get ahead of ourselves, lets zoom in on the last hour of testing.
Even at a more granular level the results are just as good. The latency range is just 0.05ms (50 microseconds). That is absolutely outstanding. It’s amazing that the 12 Gbps SAS interface is able to perform at those levels. Normally you have to move into PCIe storage to see that type of performance. While we are here, lets not forget about the LSI SAS 9300-8e. When looking at this level of performance, it’s easy to forget that there is an HBA and cable between the host and the SSD. It doesn’t appear that the 9300-8e is hindering performance in any way.