Now let’s take a look at the results obtained for WebServer pattern, which peculiarity is the complete absence of write requests:

The increase in the number of read requests from 80% in FileServer to 100% in WebServer didn’t tell on the performance of RAID 0 arrays here. Even the graph curve at 64 requests queue remained there. And RAID 1 array has finally managed to outperform a single HDD when the queue reached 64 requests. In all other modes it performed equally fast with the single drive. The RAID 10 array speed in all test modes equals that of a 2-drive RAID 0 array. Since WebServer pattern considered to be an ideal demonstration of the mirrored arrays advantages, I can say with all certainty that SiI3124 controller uses no reading optimizations for mirrored arrays.

For a more illustrative comparison here is our traditional performance rating chart built the same way as we have just done for FileServer:

Due to the majoc 64 request processing mode, RAID 1 array appeared a few tenths of a percent faster than a single HDD. Other than that the performance ratings are just the same as in FileServer pattern.