3 short questions

[Nick Hoffman]

Hi guys, I've been doing a lot of research on MySQL Cluster and have a 
couple of questions. If you wouldn't mind fielding these, I'd really 
appreciate it.

1) What is arbitration? I've seen it mentioned several times with respect 
to MGM node failure.

2) Which of the following combinations of nodes can run on a single 
physical machine?:
    1) Storage and MGM node
    2) Storage and SQL node
    3) Storage and MGM and SQL node
    4) SQL and MGM Node

3) Do all tables stored in a MySQL Cluster storage node need to use the NDB 
engine? I've read posts saying that other engines can be used (Eg: 
InnoDB), but have a feeling they're mistaken.

Thanks for your insight!
-- Nick
e: nick.hoffman@stripped
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