Could the experts on this forum advise me the best practice for the Hybrid aggregate with 4TB sata and 960GB SAS on DS460C shelf. how many SSDs are recommended for 50x4TB SATA disks.
is not a big fan of hybrid systems (didn't tested NetApp one) i think you better start without. see if there any problems, what the out put of the above command (perhaps you don't need it and flashcache doing it's job) and of course see if the clients are happy and if you see latency anywhere , if there's no issues i would use the SSD not as a tier - but as a separate aggregate to accommodate workloads that really benefit from SSD (for example SQL tempDB). but that just an opinion - without knowing your workloads......