It looks like there is about a dozen properties. Note that Hibernate OGM already knows some of them like timeout. But still there are a bunch of properties. We could go the classical way and offer one Hibernate OGM property per MongoDB property or we could simply let the user pass the JSON structure hibernate.ogm.mongodb.driver.properties = { safe:true, fsync:true } What do you think would be best? On 26 avr. 2012, at 19:22, Guillaume SCHEIBEL wrote: