We are in the process of preparing to upgrade our FAS270 with 2 shelves to a FAS2050. The FAS2050 will use internal drives, and we will make use of the existing two shelves from the FAS270 as well. The configuration was, and will still be, active/active.
The parts came in and we have two ESH4 modules, presumably to replace in the exisitng two heads in the FAS270.
So the question is how are the fiber connections made from the heads, to shelf 1 to shelf2? Do these cascade (using the up, down ports) or does each connection have to go back to the filer head itself?
You can cascade the 2 shelves onto one loop. In fact, that's most likely the way you'd want to do it rather than chewing up FC ports on the controller for each shelf. Just make sure you've got the correct cables/connectors.
Of course, I'm assuming these shelves are all FC shelves. You can't mix FC and SATA on the same loop.