The next pattern simulates the disk subsystem of a typical Web-server. The slogan of this pattern sounds like: no write requests! First, the tables:

Here are the graphs:

The lack of write requests results in no differences between the WT and WB caching modes. As usual, there is only one exception, the three-disk RAID5, which slows down in the write-back mode. The mirror arrays and the RAID5 arrays are extremely fast in this pattern.

We calculate the performance rating for the WebServer pattern like we do it for the FileServer one:

As you see, all the arrays show the same speeds in the two caching modes (save for the three-disk RAID5). The arrays that use mirroring as well as the RAID5s are faster than the RAID0 arrays of the same number of disks.