I am running a LUN-to-VM mapping with between 256\512 LUNs per hypervisor (please don’t lecture me, this is an experiment with custom orchestration software we have written and a 3rd party SAN, and it's working great in almost all ways).
One of the only scaling problems I have seen is in the Hyper-V manager (GUI only) when opening the settings for any VM.
It can take between 5-10 minutes to open the settings page. I presume this is because the GUI is enumerating all possible volumes as potential selections for a pass-through disk? The GUI must be doing it in a pretty inefficient way, as I can enumerate the volumes via diskpart in seconds, or refresh all iSCSI targets system-wide in between 6-11 seconds.
It is feasible this could be tweaked in any way?
Cheers.