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Also, most NFS RPC requests are idempotent, meaning that an NFS client may send the same request one or more times without any harmful side effects. The net result of these duplicate requests is the same. NFS RPC requests are transported using the unreliable User Datagram Protocol (UDP). NFS servers notify clients when an RPC completes by sending the client an acknowledgment (also using UDP). , MS-DOS) Disk Figure 8. The NFS structure. See text for description. A NFS client sends its RPC requests to a NFS server one at a time.

Single Delivery. Single delivery semantics require that only one of the current group members needs to receive the message for the group communication to be successful. k-Delivery. In k-delivery semantics, at least k members of the current group will receive the message successfully. Quorum Delivery. With quorum delivery semantics, a majority of the current group members will receive the message successfully. Atomic Delivery. With atomic delivery all current members of the group successfully receive the message or none does.

The parameters are unpacked from the received message and a procedure is called in a conventional manner. Thus, the parameters and return address are on the stack, and the server does not see that the original call was made on a remote client computer. The server executes the procedure call and returns the results to the virtual caller: that is, the server stub. The stub packs them into a message and issues send to return the results. The stub comes back to the beginning of its loop to issue the receive primitive, and blocks waiting for the next request message.

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38.Networking by John G. Webster (Editor)


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