I have AlwaysOn with a few AGs each has 3 replicas, 2 replicas are on the main site, and the third is on the DR site.
The distance between the main and DR site is 1500+ Miles.
I currently run all replicas with synchronous mode as I don't want to take a risk of losing any data in a case of disaster. Performance isn't an issue in my case, as our servers are strong and the throughput is sufficient.
Is it true to say that it is not the BP to have synchronous replicas to a far replica?
Can you please refer me to any BP documentation which will specify if a synchronous mode is not the right thing for a remote replica?