Hello, theflash1932 mentioned correct. But did you say you have 2 10K drive in a RAID10 config? So the other 2 is 15K? As performance wise, you would not be able to notice any performance issue, as the RAID array is at 10K config. If you were using 15K array all the while, and you replaced with a 10K, you will be able to see the performance issue.
Hello,      I have a r710 with 2 10k drives in an raid 10 configuration. When I got a spare replacement drive it was a 15k. Does anyone know if mixing a 10k and 15k drive in a raid 10 configuration would cause any problems? Thanks
Mixing spindle speeds on r710