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doc: Add warning that the root directory cannot be fragmented

Documents: 

Signed-off-by: Nathan Fish <lordcirth@gmail.com>
This commit is contained in:
Nathan Fish 2019-05-31 16:38:22 -04:00
parent 955c832df9
commit 46a9d1b78c

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@ -18,6 +18,8 @@ remain conservative about creating very large directories, as they still
have a resource cost in situations such as a CephFS client listing
the directory, where all the fragments must be loaded at once.
.. tip:: The root directory cannot be fragmented.
All directories are initially created as a single fragment. This fragment
may be *split* to divide up the directory into more fragments, and these
fragments may be *merged* to reduce the number of fragments in the directory.