Saratoga: A Scalable Data Transfer Protocol
draft-wood-tsvwg-saratoga-17

 
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Network Working Group                                            L. Wood
Internet-Draft                                             Surrey alumni
Intended status: Experimental                                    W. Eddy
Expires: October 20, 2015                                    MTI Systems
                                                                C. Smith
                                                                 Vallona
                                                              W. Ivancic
                                                                    NASA
                                                              C. Jackson
                                                                    SSTL
                                                          April 18, 2015

              Saratoga: A Scalable Data Transfer Protocol
                      draft-wood-tsvwg-saratoga-17

Abstract

   This document specifies the Saratoga transfer protocol.  Saratoga was
   originally developed to transfer remote-sensing imagery efficiently
   from a low-Earth-orbiting satellite constellation, but is useful in
   many other scenarios, including ad-hoc peer-to-peer communications,
   large-scale scientific sensing, and grid computing.  Saratoga is a
   simple, lightweight, content dissemination protocol that builds on
   UDP, and optionally uses UDP-Lite.  Saratoga is intended for use when
   moving files or streaming data between peers which may have
   permanent, sporadic or intermittent connectivity, and is capable of
   transferring very large amounts of data reliably under adverse
   conditions.  The Saratoga protocol is designed to cope with highly
   asymmetric link or path capacity between peers, and can support
   fully-unidirectional data transfer if required.  Saratoga can also
   cope with very large files for exascale computing.  In scenarios with
   dedicated links, Saratoga focuses on high link utilization to make
   the most of limited connectivity times, while standard congestion
   control mechanisms can be implemented for operation over shared
   links.  Loss recovery is implemented via a simple negative-ack ARQ
   mechanism.  The protocol specified in this document is considered to
   be appropriate for experimental use on private IP networks.

Status of This Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

Wood, et al.            Expires October 20, 2015                [Page 1]
Internet-Draft                  Saratoga                      April 2015

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   This Internet-Draft will expire on October 20, 2015.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   This document may not be modified, and derivative works of it may not
   be created, except to format it for publication as an RFC or to
   translate it into languages other than English.

Table of Contents

   1.  Background and Introduction . . . . . . . . . . . . . . . . .   3
   2.  Overview of Saratoga File Transfer  . . . . . . . . . . . . .   6
   3.  Optional Parts of Saratoga  . . . . . . . . . . . . . . . . .  11
     3.1.  Optional but useful functions in Saratoga . . . . . . . .  11
     3.2.  Optional congestion control . . . . . . . . . . . . . . .  12
     3.3.  Optional functionality requiring other protocols  . . . .  12
   4.  Packet Types  . . . . . . . . . . . . . . . . . . . . . . . .  13
     4.1.  BEACON  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     4.2.  REQUEST . . . . . . . . . . . . . . . . . . . . . . . . .  21
     4.3.  METADATA  . . . . . . . . . . . . . . . . . . . . . . . .  25
     4.4.  DATA  . . . . . . . . . . . . . . . . . . . . . . . . . .  30
     4.5.  STATUS  . . . . . . . . . . . . . . . . . . . . . . . . .  34
   5.  The Directory Entry . . . . . . . . . . . . . . . . . . . . .  41
   6.  Behaviour of a Saratoga Peer  . . . . . . . . . . . . . . . .  45
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