Thank you for your answer. However I still don't understand how to calculate mixed config, because those tests are made with only ssd or only hdd. So If I would like to set up a system which capable of random rw 20.000 IOPS in a Raid5 config, I could buy 180 15K HDD (from the table number 6 Raid5 HDD 29,100 IOPS; 16GB FC). But I don't want to buy so much hdd so
I could buy only 18 (2x9 for poolA and poolB), which will be 2910 IOPS. (I think i'm right if I simple divide the above). Then I said it is far from the desired so I would speed up this with some ssd. But how?
A) Using performance tier: If I buy 6 ssd (from table number 12) which 80000 IOPS the result will be the sum of the two disk group? 80000+2910 =82910 IOPS? In every circumstances ? Becuase if somehow it falls back to the hdds iops it is far form the required 20000 IOPS... So it is not so clear for me.
B) Adding caching tier : it is completely a dark patch for me, how the read cache is alter the underlying hdd performance / iops. Because it is a read cache I suppose it is only meaningful in case of read operations. But how can I roughly calculate with this options? In addition if I right I can not use both the performance tier and read cache for the same pool.
So could somebody help me how people planing capacity and speed? (maybe there is a general procedure , which is not only applicable for hpe)
You wrote: "Once you have the setup ready , as per the benchmark defined in the doc, you can measure performance matrix directly from web or cli console of MSA 2052."
You mean there is a web page where I can add configuration and that shows me an approximately calculation? I would like to "measure" before I buy
thank you very much