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by randomstring 1917 days ago
I just advertise both Pi-Holes via DHCP and when I configure manual DNS settings. The primary DNS gets the vast majority of the DNS traffic, about 150 requests/minute and the secondary gets about 10 requests/minute (mostly from a single device).

Both piholes are on different UPS power, different switches, in different locations. In theory the lights will go out on the main UPS and switch first (it draws more power), but this configuration did save me once.