We’re about to purchase 2 poweredge 2950 to run in a MMM setup for a php web application. The read/write volume is 70/30, however there are a couple of fairly intensive read queries that can take .5-.6 seconds on fairly equipped servers.
The question now is what type of drives/raid setup to go for, specifically:
How big a difference will 15K vs. 10K drives make in a raid 10 setup (Perc5). 15K are FAR more expensive, are they essential?
How big a difference will 8 vs. 6 vs. 4 drives make performance wise in raid 10 setup?
How big a difference will 2.5" drives vs. 3.5" drives make?
We’re contemplating many different setups, while also trying to be as conservative on the finances as possible.