Hi, Thanks for your question about IOP calculations. I think your calculation should give a good idea of what the max IOPS are. Is this an existing configuration or one being designed still? Are you having performance issues? This might help if you are [URL] Let us know if you have any additional questions.
for 'classical storage', potential IOP limits tend to be something like Drive type Maximum recommended IOPS per driveSAS Flash (all types) 20,000SAS 15K 350SAS 10K 250NL-SAS 150   with RAID type co-efficient. For Isilon the above does not apply as node type needs to be taken into account. So how do I calculate the max IOP capability of an isilon array. Presumably its also complicated by directories being pinned to different tiers, ie if I have  multiple F* nodes and H* nodes and pinned directory x to H* nodes, then theoretical IOP capability of F* nodes is irrelevant other than saying directories pinned to F* nodes do not consume H* nodes theoretical IOPs ?  
IOP calculation ( disk and node type )