I need to run a repairDatabase in mongo in order to reclaim some os disk space. Can anyone provide feedback on the following procedure: let me know if its correct, if I'm missing anything, if the steps are in order, etc. The setup is a primary/secondary on separate servers. They are both about out of disk space. My plan is to repair the database on each one separately after the other completes. As I am out of disk space, I will be using an external block storage from my cloud provider to use as a repair path. Mongo is currently running via sudo service mongodb start. To complete this it seems that I'll run the following: - On the primary I step down using rs.stepDown() - I shutdown mongo using rs.shutdownServer() - Is this correct? For the next step it seems that I shouldn't run it if Mongo already has another instance running. - On the primary I run mongod --config /etc/mongodb.conf --repair --repairpath PATH_TO_BLOCK_STORAGE - When complete, do I need to copy the data in the repair path over to the original (/var/lib/mongodb)? - Once back up, I restart Mongo using sudo service mongodb start - I then wait for the oplogs to catch up and for the mongos to be in sync. - Once they primary and secondary are in sync I then go onto mongodb-perf-02 and run rs.stepDown() so that mongodb-perf-01 is the primary again. - Once complete I then repeat this on the secondary.