List of peers doesn't work for me? Need advice

Can anyone explain how to get list of peers where is block(chunk) that I need?

Details. I’m saving in cluster to one node a file and than this file using config replicated to other 3 nodes. If I connected to node where this file was saved than I download it without a problem. But if I connected to node that doesnt contain that file than when I try to Get it than this node downloads file from peer which contains file that I need and only than I download it. So how to know where is my file? Which nodes are peers? Than I’ll be able to connect to node with this file and avoid downloading it to another node