Interesting NFSv3 errors

While reading through RFC 1813 (NFSv3 RFC), I came across the following interesting NFS error:

NFS3ERR_JUKEBOX

     The server initiated the request, but was not able to
     complete it in a timely fashion. The client should wait
     and then try the request with a new RPC transaction ID.
     For example, this error should be returned from a server
     that supports hierarchical storage and receives a request
     to process a file that has been migrated. In this case,
     the server should start the immigration process and
     respond to client with this error.

This is nifty, and leads me to wonder if any NFS-based HSM solutions are utilizing this.

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