afaik single server durability was a problem in the past. Since 1.8 they've introduced journaling and it's now enabled by default in 2.0 More info here: http://

afaik single server durability was a problem in the past. Since 1.8 they've introduced journaling and it's now enabled by default in 2.0 More info here: http://blog.mongodb.org/post/381927266/what-about-durability http://blog.mongodb.org/post/381927266/what-about-durability and here: http://www.mongodb.org/display/DOCS/Durability+and+Repair http://www.mongodb.org/display/DOCS/Durability+and+Repair