Hi All:
Months ago, during a migration (moving SQL to new virtualized hardware) I combined 2012R2 and 2016 Guest OS in the same WSFC, only needed during a 2 week migration and it worked well. Then I decommed the old boxes and business as usual on the new boxes. During the validation wizard of the WSFC, it gave a warning but could create it.
Now I want to do this with some of my 2012 Proper boxes (NOT R2) but it gives a hard error, I can still get past it, but curious if anyone can point me if this is supported in any way, for migration purposes only, I found docs on the 2012R2 and 2016 in the same cluster months ago, now I can no longer find them. Any help would be appreciated.