I am replacing my four year old VMware ESXi home server and have just copied a windows server 2012 ISO to both machines. My old machine has 4 x1TB HDDs on an adaptec 5405. My new machine has 4x 4TB HDDs on an LSI MegaRAID 9270-8i (no battery backup yet - should arrive soon). Both RAID arrays are configured as RAID-5.
The copy using the old adaptec took 1min 10s
The copy using the new LSI took 18min 39s
I have configured read ahead on, write-through on the LSI. Do you know what could be wrong? Are there any settings on the motherboard I might have overlooked? Other LSI controller settings?