As a part of its native replication, MongoDB maintains multiple copies of data in a construct called a replica set.
So, what is a replica set? A replica set in MongoDB is a group of mongod (primary daemon process for the MongoDB system) process that maintains the same data set. Put simply, it is a group of MongoDB servers operating in a primary / secondary failover fashion. Replica sets provide redundancy and high availability.
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This book is a great reference for SRM and/or vSphere Replication and is written for the current version (5.5). It details step-by-step how to to deploy and configure both products. The author does an excellent job making the concepts easy to consume and uses diagrams to make the more advanced topics more understandable. Perfect for a beginner and has lots of value-add for the experienced administrator.
The book is a smooth and straightforward read. As a VMware Certified Instructor, I will happily recommend this book for students to read.
Check it out here: http://bit.ly/1kosrhz