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Essentially, my question is: how does casper-rw (IIRC) work? Every time it boots, it copies the entire file? Every time it shuts down, it recreates it?

Also does its size affect the speed?

RTFM links on casper-rw/persistence appreciated.

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casper-rw isn't the only implementation of persistence. –  Ignacio Vazquez-Abrams Mar 20 '12 at 6:05
    
Any other examples? –  ben Mar 21 '12 at 5:13

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