IOPS, latency, throughput calculation (in case msa 2052)

Dear All,

I read a lot of docs on web in the topic, however the more I read the more question I have. Beyond the main iops calculation for the raid arrays (which includes the write penalties), I'm a bit lost how to calculate total iops (and latecy, throughput) for a hybrid pool in theoretically. (I'm thinking in msa 2052). 

1)In a raid5 or raid6 using more disk than the minimum, the total iops calculated with the total disk number with the parity disk(s) or without those?   

2)In a capacity tier pool includes  raid1 2xSSD with oips X and raid5  6x10k sas with iops Y. Is the calculated total will be its sum (X+Y)?

3)In case of using read cache (for example 2x800Gb ssd in raid1) what is the general method to guess the read cache usage (%) and how can it summarize with the underlying pool iops capability to get a roughly total? 

Thank you very much