And now let’s see how the controller performs in a pattern that emulates a web-server disk load:
The graphs of the RAID0 arrays haven’t changed much in comparison with the File Server pattern. The RAID5 and RAID6 have become faster because the Web Server pattern doesn’t include write requests and reading is the optimal operating mode for these array types. For the same reason, the mirrored RAID1 and RAID10 arrays that use a special algorithm for optimized reading from mirror couples are almost everywhere faster than the two- and four-disk RAID0, respectively.
We calculated performance ratings for the arrays by the same formula as for the File Server pattern.
The RAID10, RAID6 and RAID5 made good use of the opportunity to work without any write requests. Although the four-disk arrays all have very close speeds, the RAID10 is the best. The four-disk RAID5 proved to be faster than the RAID6 while the four-disk RAID0 didn’t even make it into the top three. The three-disk RAID0 is slower than the three-disk RAID5 whereas the RAID1 is quite far ahead of the two-disk RAID0.