I was reading a best practices document, and in the Storage Cluster section it recommended using the same tier of storage within the storage cluster, same disktype, raid type, etc.
I had been considering a storage cluster with multiple tiers of storage (FC and NL drives), with the hope that Storage DRS would allow us to more efficiently deal with VM IO contention. Meaning, if a VM ultimately wasn't pegging a particular low tier datastore (ie NL-R6), it would remain there, while a high IO VM would inevitably get the suggested move to a datastore in the cluster with greater bandwidth (ie FC-R5 or FC-R1). The goal of this thinking was to ensure that we weren't using expensive FC-R1 for a VM that wasn't particularly heavy, without the need to micromanage where a VM lives. All in the hope of reducing the administrative overhead of our infrastructure.
If Storage DRS is not meant to be used in this way, and I end up creating the typical Gold, Silver, and Bronze tier model, what's the best way to know when a VM is in the wrong tier?