I am reviewing quote for a server upgrade. (RHEL).
The server will have both Apache and MySQL on it, but the reason for upgrade is to increase DB performance. CPU has been upgraded massively, but I know that disk speed is also a factor.
So RAID 10 is faster performance than RAID 5, but how much difference does the drive speed make?
(The 15k discs in the RAID 5 config is at the top of my budget btw, hence not considdering 4x15k discs in RAID 10, which I assume would be the optimum.)