Network File System (NFS) Version 4 Minor Version 2 Protocol
RFC 7862

Document Type RFC - Proposed Standard (November 2016; No errata)
Last updated 2016-11-10
Stream IETF
Formats plain text pdf html bibtex
Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Spencer Shepler
Shepherd write-up Show (last changed 2015-09-10)
IESG IESG state RFC 7862 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Spencer Dawkins
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                         T. Haynes
Request for Comments: 7862                                  Primary Data
Category: Standards Track                                  November 2016
ISSN: 2070-1721

      Network File System (NFS) Version 4 Minor Version 2 Protocol

Abstract

   This document describes NFS version 4 minor version 2; it describes
   the protocol extensions made from NFS version 4 minor version 1.
   Major extensions introduced in NFS version 4 minor version 2 include
   the following: Server-Side Copy, Application Input/Output (I/O)
   Advise, Space Reservations, Sparse Files, Application Data Blocks,
   and Labeled NFS.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7862.

Copyright Notice

   Copyright (c) 2016 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
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Haynes                       Standards Track                    [Page 1]
RFC 7862                         NFSv4.2                   November 2016

Table of Contents

   1. Introduction ....................................................4
      1.1. Requirements Language ......................................4
      1.2. Scope of This Document .....................................5
      1.3. NFSv4.2 Goals ..............................................5
      1.4. Overview of NFSv4.2 Features ...............................6
           1.4.1. Server-Side Clone and Copy ..........................6
           1.4.2. Application Input/Output (I/O) Advise ...............6
           1.4.3. Sparse Files ........................................6
           1.4.4. Space Reservation ...................................7
           1.4.5. Application Data Block (ADB) Support ................7
           1.4.6. Labeled NFS .........................................7
           1.4.7. Layout Enhancements .................................7
      1.5. Enhancements to Minor Versioning Model .....................7
   2. Minor Versioning ................................................8
   3. pNFS Considerations for New Operations ..........................9
      3.1. Atomicity for ALLOCATE and DEALLOCATE ......................9
      3.2. Sharing of Stateids with NFSv4.1 ...........................9
      3.3. NFSv4.2 as a Storage Protocol in pNFS: The File
           Layout Type ................................................9
           3.3.1. Operations Sent to NFSv4.2 Data Servers .............9
   4. Server-Side Copy ...............................................10
      4.1. Protocol Overview .........................................10
           4.1.1. COPY Operations ....................................11
           4.1.2. Requirements for Operations ........................11
      4.2. Requirements for Inter-Server Copy ........................13
      4.3. Implementation Considerations .............................13
           4.3.1. Locking the Files ..................................13
           4.3.2. Client Caches ......................................14
      4.4. Intra-Server Copy .........................................14
      4.5. Inter-Server Copy .........................................16
      4.6. Server-to-Server Copy Protocol ............................19
           4.6.1. Considerations on Selecting a Copy Protocol ........19
           4.6.2. Using NFSv4.x as the Copy Protocol .................19
           4.6.3. Using an Alternative Copy Protocol .................20
      4.7. netloc4 - Network Locations ...............................21
      4.8. Copy Offload Stateids .....................................21
      4.9. Security Considerations for Server-Side Copy ..............22
           4.9.1. Inter-Server Copy Security .........................22
Show full document text