Is MongoDB Master-Slave Configuration Feasible

  mongodb, question

Main 4G RAM, 100G SSD
From 2G RAM, 100G SSD.

There is not much traffic on the website. Both reading and writing are done by the host, and the slave is only for redundant backup.
Question: Can this ensure strong consistency?
Do you want to add fsync = true to PHP writes?

No matter whether the traffic is large or small, it is best not to add another machine to the master-slave network to build a fragmented cluster. Please refer to here.