So now I have some more wooly questions that betray my ignorance (I've got a few of those on this forum

So I was thinking of a requirement that said something like: The primary array shall be capable of delivering a minimum of 9000 IOPS for a simulated mixed workload of random 70/30 Read/Writes using a 4K sample block size over a 1TB RAID5 volume at a latency of <10ms during all system functions including snapshot operations.
Trouble is, I have no real world experience of storage array performance. I don't know if this is actually good, bad or average. Should a 3PAR with the the number and type of disks I've configured be delivering significantly more than this with this kind of test workload or would that be reasonable performance?