|OCZ Vertex SSD RAID-0 Performance|
|Reviews - Featured Reviews: Storage|
|Written by Olin Coles|
|Friday, 03 April 2009|
Page 7 of 14
ATTO Disk Benchmark Results
EDITORS NOTE: ATTO Disk Benchmark is not designed to be used as bandwidth speed tool, as the final results are determined by user-set variables. Benchmark Reviews uses ATTO Disk Benchmark as a tool for illustrating basic IOPS load performance at various chunk load sizes. Please read the Solid State Drive Benchmark Performance Testing article to understand how the benchmarks used in this article should be interpreted.
EDITORS NOTE 05/10/2009: Benchmark Reviews has re-tested the OCZ Vertex with the latest v1.10 firmware, which includes TRIM support, and the resulting performance was generally identical to the previous firmware. Please remember that TRIM is a Windows 7 supported feature, and does not improve performance on Windows XP or Vista Operating Systesm.
The ATTO Disk Benchmark program is free, and offers a comprehensive set of test variables to work with. In terms of disk performance, it measures interface transfer rates at various intervals for a user-specified length and then reports read and write speeds for these spot-tests. There are some minor improvements made to the 2.34 version of the program, but the benchmark is still limited to non-linear samples up to 256MB. While the bandwidth results are no realistic for determining the maximum drive speeds, ATTO Disk Benchmark is still a good tool for illustrating the bandwidth at different file size chunks. Please consider the results displayed by this benchmark to be basic IOPS performance indicators.
Beginning with the integrated Intel ICH10R Southbridge chip connected to the OCZ Vertex, the ATTO Disk Benchmark tools performs file transfers ranging from 0.5 KB to 8192 KB. This 120GB OCZSSD2-1VTX120G part shows a 249 MBps read plateau from 256-8192 KB file chunks, while the 127 MBps write performance plateaus from 128-8192 KB. This isn't nearly as good as we experienced with the OCZ Apex SSD, but still very good none the less.
Although OCZ has integrated a 64MB buffer on the Vertex SSD, it still have lukewarm writer performance with small file chunks. The larger buffer helps, but the two internal SSD controllers found handling a RAID-0 striped array on the OCZ Apex SSD did better. OCZ uses ATTO to define maximum read and write bandwidth for the OCZSSD2-1VTX120G, which is stated as 200 MBps read and 160 MBps write bandwidth. While the read performance is well-above that figure and nearing 250 MBps, the write performance is considerably less at around 137 MBps according to ATTO. So that's what the single OCZ Vertex looks like; now let's look at a striped RAID-0 set of solid state drives:
Compared to a single Vertex SSD configuration, the RAID-0 SSDs don't plateau performance until the 256 KB sized file chunks. A single Vertex offered 249 MBps maximum read performance, while the RAID-0 Vertex recorded a 438 MBps top speed. That's not quite 100% of a single Vertex SSD, but 76% isn't bad considering overhead and throughput managment. Moving on to the read-from performance, a single Vertex SSD gave a best speed of 137 MBps while the RAID-0 Vertex SSDs offered an impressive 358 MBps for 161% improvement!
In our next section, we test linear read and write bandwidth performance of the OCZ Vertex and compare its speed against several other top storage products. Benchmark Reviews feels that linear tests are the best method for testing SSD products, as detailed in our Solid State Drive Benchmark Performance Testing article.