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Honest question - where would someone with no Mongo experience typically discover that?

For one, it's mentioned in Chapter 5: When To Use MongoDB in The Little MongoDB Book. http://openmymind.net/mongodb.pdf

That isn't official documentation as far as I can tell, though. I don't think I should need to read 5 chapters into a separate book for something so seemingly fundamental.

IMO, this is important enough information that it should be mentioned from the start, but it isn't in the tutorial[1], nor can I find it in the FAQ[2].

[1] http://www.mongodb.org/display/DOCS/Tutorial [2] http://docs.mongodb.org/manual/faq/

You're right, it's not official documentation, but it was the first thing I read when I decided to start learning Mongo. I've also seen 10gen hand out hard copies at meetups in NYC. Anecdotal, I know, but maybe helpful to someone.

There's also a reference to the issue in your second link, though it's not super clear. http://docs.mongodb.org/manual/faq/replica-sets/#are-write-o...

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