Map Server Groups to UD/FD

[benofben]

Might have to wait for the restructuring on availability sets. Need to confirm w Boris...

[benofben]

I think I'm just going to wait for VMSS to do this.

[benofben]

Need to understand how VMSS are handling UD/FD. We probably want FD=2 with FD 1 containing 10 UDs and FD 2 containing another 10, assuming that's possible.

[benofben]

VMSS currently have 5 FD each with 1 UD. There's no sensible way to map this to server groups, but it should work perfectly well for 5 or fewer nodes and present minimal risk for small clusters with a greater number, particularly when used with persistent storage. Late this year Microsoft is planning enhancements to VMSS which could improve this situation. I'm going to leave this open and continue to work with Guy as new updates become available. It sounds like Ignite this year is going to be exciting...

[benofben]

Trying to understand what would happen if we just create five server groups, even if the replica count is less.