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doc: Add warning that the root directory cannot be fragmented
Documents: #39704 Signed-off-by: Nathan Fish <lordcirth@gmail.com>
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@ -18,6 +18,8 @@ remain conservative about creating very large directories, as they still
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have a resource cost in situations such as a CephFS client listing
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the directory, where all the fragments must be loaded at once.
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.. tip:: The root directory cannot be fragmented.
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All directories are initially created as a single fragment. This fragment
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may be *split* to divide up the directory into more fragments, and these
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fragments may be *merged* to reduce the number of fragments in the directory.
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