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doc: Removed legacy doc. Not needed.

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Signed-off-by: John Wilkins <john.wilkins@inktank.com>
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John Wilkins 2012-09-19 16:27:16 -07:00
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doc/appendix/differences-from-posix.rst
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========================
Differences from POSIX
========================
.. todo:: delete http://ceph.com/wiki/Differences_from_POSIX
Ceph does have a few places where it diverges from strict POSIX semantics for various reasons:
- Sparse files propagate incorrectly to tools like df. They will only
use up the required space, but in df will increase the "used" space
by the full file size. We do this because actually keeping track of
the space a large, sparse file uses is very expensive.
- In shared simultaneous writer situations, a write that crosses
object boundaries is not necessarily atomic. This means that you
could have writer A write "aa|aa" and writer B write "bb|bb"
simultaneously (where | is the object boundary), and end up with
"aa|bb" rather than the proper "aa|aa" or "bb|bb".