/DUPLICATES=( ALL | DONE | ERROR | INPROGRESS | NEW )

   Displays the content of the duplicate request cache.  These are
   copies of the active as well as cached non-idempotent operation
   responses.

   Non-idempotent operations are those which could not be executed
   twice and return the same result.  The following operations are
   non-idempotent:

     CREATE  (create a file or special file)
     LINK    (create a hard link)
     MKDIR   (create a directory file)
     REMOVE  (delete a file or special file)
     REMDIR  (delete a directory)
     RENAME  (rename a file, special file or directory)
     SYMLINK (create a symbolic link)
     UNLINK  (delete a hard link)

   Duplicates are marked with one of four states:

   DONE        - The entry represents an NFS request which has
                 been satisified, and the response will be resent
                 if a matching (duplicate) request is received.

   ERROR       - The entry represents a request in error.

   INPROGRESS  - The entry represents an NFS request which is
                 currently being processed by the NFS server.
                 When a matching duplicate is received, the new
                 (duplicate) request will be discarded without
                 any response, since one will be dispatched when
                 the original request is complete.

   NEW         - The entry was either never used (initial state)
                 or the corresponding request was idempotent and
                 the response has already been sent.

   The /DUPLICATES qualifier, by default, will display only the
   DONE, ERROR and INPROGRESS entries.  You may specify which ones
   you are interested in seeing by specifying a value, for example,
   /DUPLICATES=INPROGRESS will only show requests that are being
   actively worked on by the server.  Specifying ALL will show all
   entries, including those marked NEW.  You may specify more than
   one entry type by enclosing the particular types in parenthesis
   and separating them with commas, such as the following example:
   /DUPLICATES=(DONE,INPROGRESS).