ADVANCED WRITE TESTING
With the following tests, we stressed the drives using random 4KiB write workloads across the entire span for at least 24 hours. Every second, we record the average IOPS during that one second. Normally this exposes weak SSD controllers that become overwhelmed with excess P/E cycles. For RAID cards, we are measuring the performance of both the ROC and the SSDs.
With RAID adapters, there is an extra level of management that may obfuscate the actual performance of the SSDs. Since we know for a fact that the SMART Optimus drives enter steady-state very quickly and remain very stable throughout prolonged tests, any hiccups we may observe should be caused by the RAID controller. That is the intent, anyway. The following graphs show the final 60 minutes of our 24 hour torture test.
The results can’t be described as anything less than fantastic. As impressive as the graph is, it actually doesn’t do the ASR-72405 and Optimus drives justice. Looking at the raw data, a couple of numbers stood out. The first is that 99.6% of all 1s averages were under 0.7ms. Impressive, right? How about this – 98.81% of all 1s averages were between 0.69 and 0.70ms! This is made all the more impressive since the ASR-72405 was in write-through mode, meaning it was not using its onboard cache.