> Hm I was wonder if check is done when:
>
> client 1: open(file,O_RW);
> client 2: open(file,O_RW);
>
> wont this lead to corruption which will take the volume offline?

It leads to a client/server conflict on one client (or perhaps even both?). 
See:

   http://www.coda.cs.cmu.edu/doc/html/coda-howto-4.html#ss4.7

(If I am being incorrect/misleading, someone please correct me.)

-- 
/ Peter Schuller, InfiDyne Technologies HB

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