Database Reference
In-Depth Information
Overview of replica sets
There are two ways to deploy a replica set, for production or development, and testing. In
this chapter, we will deploy replica set for production use. The same procedure is used to
deploy a replica set in a development environment, but the requirements are different.
A three-member replica set can provide enough power to overcome network and server is-
sues. To have a smooth election process, it's recommended that you have an odd number of
members in a replica set.
The following diagram shows a replica set with three members:
Likewise, for production use of a replica set, each replica set should be hosted on different
machines. As you are aware, each machine can face network or hardware failure, so by
hosting Missing object type instance on different machines, we can make sure that if a ma-
chine fails, we won't lose all the
mongod
processes.
