Deploying a Replica Set I am new to MongoDB. I am trying to create a Replica Set for testing and development. It shows me the message in the picture!



I followed the steps shown in the official documentation:

Deploy a Replica Set for Testing and Development

What is the problem please ?
You are using 32-bit OS and 32-bit builds do not support the WiredTiger storage engine.

You need to use either 64-bit or change your storage engine to mmapv1 as suggested in screenshot by passing parameter explicitly. --storageEngine=mmapv1

check here https://docs.mongodb.org/manual/administration/production-notes/