|SandForce SF1200 RAID-0 SSD Performance|
|Reviews - Featured Reviews: Storage|
|Written by Olin Coles|
|Tuesday, 04 May 2010|
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Alex Schepeljanski of Alex Intelligent Software develops the free AS SSD Benchmark utility for testing storage devices. The AS SSD Benchmark tests sequential read and write speeds, input/output operational performance, and response times. Because this software receives frequent updates, Benchmark Reviews recommends that you compare results only within the same version family.
Beginning with sequential read and write performance, our pair of SandForce SF-1200 SSDs combined into a RAID-0 array with 4KB stripes produced 336.2 MB/s read speed, but only 152.1 MB/s write performance. The sequential file transfer speeds have traditionally been low with this benchmark tool, especially for SandForce controllers, which is why we will concentrate on the operational IOPS performance for this section.
Single-threaded 4K IOPS performance delivers 16.81 MB/s read operations, which is nearly identical to single-drive performance. Write operations rendered 141.26 MB/s and measures nearly double the performance of a single SSD. Similarly, the 64-thread 4K reads recorded 223.71 MB/s, while write performance was 141.26.
Compared to the 4KB stripes, 128KB RAID-0 stripes appear to make the first big impact with sequential read performance (although write performance lags slightly behind). 4KB single-threaded performance was slightly higher, but a 4 MB/s improvement (compared to 227.8 MB/s) was seen in 4K-64 thread read tests, and an additional 2 MB/s for 4K-64Thrd writes.
Displayed in the chart below, the 64-thread 4KB IOPS performance results for several enthusiast-level storage products illustrates which products offer the best operation under load:
In the next section, Benchmark Reviews tests transfer rates using ATTO Disk Benchmark.