Open Stack

Hello,

I have been trying to find out some info about features OpenStack 
provide and still cannot figure out whether 'cloud features' are 
available by default. By 'cloud features' I mean proper handling 
situations where we have many instances running on many different 
hardware servers. Suddently one server (physically) goes down, something 
bad happened. How will the OpenStack as a cloud behave by default? Will 
it run all the lost instances on other hardware servers or this should 
be specifically configured or programmed? How about data replication? 
Users shouldn't notice anything, as all the instances are ran in the 
cloud. Is it available by default? I couldn't find any docs that would 
explain these topics in a detailed way. Thanks for your explanation.
-- 
regards

M