Please be aware the Intel Rapid Storage Technology is a software RAID solution, which means that the data stripping is calculated by the processor and using the system resources, in addition the performance may be affected by the rest of the software running on the background, the performance test application being used, the type of memory and processor installed and also the settings of the performance tester which may have a big impact on the results.
Further than this, I regret to inform you that Intel does not evaluate the performance of the specific RAID configurations used. In this case, if you have concerns about the performance and data transfers on your computer, please refer directly to your computer manufacturer.
If you are doing performance measurements make sure you have the latest Intel Rapid Storage Technology at the link below:
I am aware of the limitations of a software RAID solution, such as the one implemented by Intel in the Rapid Storage Technology. I was trying to raise awareness of an issue that affects a corner case scenario in the RST + SRT system, which is accelerating a RAID5 array.
As I am sure you are aware, the SRT technology should provide better transfer rate & access time to pages of storage that have been cached to the SSD, while access to non-cached pages should intuitively remain the same. I have observed this to be true with a single disk, a RAID0 array and a RAID1 array. When the same tests have been done on a RAID5 array (namely, HDTune's read speed benchmark), the result was surprisingly different, as I have stated above.
Is this normal behavior? Did the Intel QA team test such scenarios? Is it an incompatibility between HDD manufacturer, Motherboard manufacturer or SRT software?
P.S.: I forgot to add that all drivers are updated to the latest available version, with the exception of the BIOS which, from what I can tell from the changelogs, does not improve the Matrix Storage functionality
It is a normal behavior that a RAID 0 to provide better transfer rate & access time than a RAID 5, since a RAID 0 is known as a stripe set or striped volume, and RAID 5 uses block-level striping with parity data distributed across all member disks so it will take more time. The Intel Rapid Storage Technology, incompatibility between hard drives or the motherboard will not be a cause of the transfer rate & access time.