The replica set is stable for some time. HD space, memory, and swap file seem to be all in line. Checked the mongodb log and it reports no error and shows where we restarted the servers with a large time gap in between. Checked the oplog size and it says it's good for 1000hours. I tested the connections between the members using ping and the "mongo --host m2.example.net --port 27017" method. Everything looks good.