MongoDB 3.0 introduces a new storage engine called
wiredTiger which results in greatly reduced memory and disk space usage.
Since my DB is currently at ~20 million objects and using up ~70GB of RAM, this update comes in at just the right time to postpone a hardware update.
How do you migrate an existing installation of MongoDB 2.6 to 3.0 and at the same time get the benefits of wiredTiger?
The Documentation refers to options which result in startup errors which prevent MongoDB from starting up. Also, file locations don't match the ones in Ubuntu (Server 14.04 LTS).