ADVANCED WRITE TESTING
As we talked about in our Micron P400m SSD Review, SSDs have different performance states. Since the Adaptec and HGST products are enterprise, 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.
Well, we weren’t quite expecting that. The first thing that jumps out is that we were getting 500K write IOPS, which is an outstanding number. The second is how incredibly consistent the results were across 11 hours of testing. In 11 hours of testing, once the system achieved steady-state, the average latency per minute varied by less than 2 microseconds. Now lets zoom in on that last hour.
Wow. Even though there is a slope, look at the scale. Over the last hour, the results varied by less than 500 nanoseconds. This is by far the best consistency we have ever seen. Until we get a proper 12Gbps RAID solution from LSI, we won’t be able to tell who to heap the praise on, Adaptec or HGST. Until then, we will give the credit to both. Amazing performance.