Our IOMeter workloads feature a ramping number of concurrent I/O requests. Most desktop systems will only have a few requests in flight at any given time (87% of DriveBench 2.0 requests have a queue depth of four or less). We've extended our scaling up to 32 concurrent requests to reach the depth of the Native Command Queuing pipeline associated with the Serial ATA specification. Ramping up the number of requests also gives us a sense of how the drives might perform in more demanding enterprise environments.
We run our IOMeter tests using the fully randomized data pattern, which presents a particular challenge for SandForce's write compression scheme. We'd rather measure SSD performance in this worst-case scenario than using easily compressible data.
Did we mention that LAMD has been making SSD controllers for enterprise customers? Our IOMeter results certainly hint at that server pedigree, because the Neutrons completely dominate the competition. The file server, workstation, and database tests mix read and write operations, and that's where the Neutrons are at their finest. They offer higher transaction rates than any of the other SSDs regardless of the load.
The beatdown isn't as overwhelming in the web server test, which is made up exclusively of read operations. With that workload, the Neutrons trade blows with the Samsung 830 Series, racing out to an early lead before trailing as the load exceeds eight concurrent I/O requests.
As one might expect given the other performance results we've seen already, the standard Neutron shadows the GTX in the read-dominated web server test. The gaps between the Neutrons are wider in the other tests, but never by all that much.
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