The Setup, Methodolgy and SANDRA
Our Test Methodologies: Under each test condition, the Solid State Drives tested here were installed as secondary volumes in our testbed, with a standard spinning hard disk for the OS and benchmark installations. The SSDs were left blank without partitions wherever possible, unless a test required them to be partitioned and formatted, as was the case with our ATTO benchmark tests. Windows firewall, automatic updates and screen savers were all disabled before testing. In all test runs, we rebooted the system and waited several minutes for drive activity to settle before invoking a test.
On a side note, thanks to our friends at DV Nation for their assistance in supplying the Fusion-io ioDrive we used for testing. If you're looking for high end SSD storage, they're a good place to start.
Also, you'll note that we performed all of our SSD RAID testing with the Intel X25-M drives on an Intel X58 chipset-based motherboard via its ICH10R Southbridge SATA controller. This controller offered peak RAID 0 performance versus even the hardware-based RAID controllers we had in the lab for testing.
In our SiSoft SANDRA testing, we used the Physical Disk test suite. We ran the tests without formatting the drives and both read and write performance metrics are detailed below. Please forgive the use of these screen captures and thumbnails, which will require a few more clicks on your part. However, we felt it was important to show you the graph lines in each of the SANDRA test runs, so you are able to see how the drives perform over time and memory location and not just an average rated result.
2 x Intel X25-M SSD RAID 0 - Write Performance
4 x Intel X25-M SSD RAID 0 - Write Performance
Looking at these preliminary, high level numbers from SANDRA, it's apparent that there are somewhat diminishing returns in read performance, as we scale from two to four SSDs in a RAID 0 configuration. However, write performance almost doubles linearly.
The Fusion-io ioDrive however shows a much less saw-toothed performance curve, with flat 650+MB/sec performance whether looking at read or write throughput. Looking at the graph, you can tell this technology means business and a sequential access pattern like a SANDRA benchmark run isn't going to saturate its throughput capability.