[Couchdb Wiki] Update of "Durability Matrix" by AdamKocoloski

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The following page has been changed by AdamKocoloski:
http://wiki.apache.org/couchdb/Durability_Matrix

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  = How file:sync() works =
  
- All data flushing is performed by file:sync(IoDevice). This function maps to fsync(fd) on most platforms, with the notable exception of OS/X where fcntl(F_FULLSYNC) is called instead.
+ All data flushing is performed by file:sync(IoDevice). This function maps to fsync(fd) on most platforms, with the notable exception of OS/X where fcntl(F_FULLFSYNC) is called instead.
  
- A call to fsync(fd) should ensure, on completion, that all pending writes have reached the disk. On many platforms, and Linux in particular, this promise is not upheld in the presence of write-caching disk controllers. On affected configurations, a call to fsync(fd) will complete as soon as all pending writes have reached the cache of the disk controller itself. If your controller has battery-backing, you might decide this is sufficiently durable. On OS/X, the fcntl(F_FULLSYNC) really gets all pending writes to disk even in the presence of a write-caching disk controller. This is the reason that CouchDB is "slower" on OS/X.
+ A call to fsync(fd) should ensure, on completion, that all pending writes have reached the disk. On many platforms, and Linux in particular, this promise is not upheld in the presence of write-caching disk controllers. On affected configurations, a call to fsync(fd) will complete as soon as all pending writes have reached the cache of the disk controller itself. If your controller has battery-backing, you might decide this is sufficiently durable. On OS/X, the fcntl(F_FULLFSYNC) really gets all pending writes to disk even in the presence of a write-caching disk controller. This is the reason that CouchDB is "slower" on OS/X.
  
  = How CouchDB uses fsync() =