Looking for an expert advise on MD 3460 "Start demand cache flushing" and "cache block size" recommendation by dell with exchange deployment (in my case version is exchange 2016).

i tried searching and found some sort of articles and what i understood from all this is, setting up higher cache flush is good choice but am still confused on block size selection ? infact there is nothing i found which is very specifically written for exchange recommendation..

hoping someone helps with referenced resources. Thank You ..