Let's say I have a server with 6 hard drives for vps hosting. If I had a really disk intensive server would it be better to separate them and say use three raid1 partitions or would it be better to use 1 large raid10? I'm wondering if heavy disk I/o on one raid1 would affect another.
If you're doing multiple RAID-1 on the same RAID controller, you wouldn't be gaining any performance. RAID-10 would give you better performance. But it would be a different story If you used several RAID-1 with a different controller for each pair of HDs.