NFSv4.0 Migration: Specification Update
RFC 7931

Document Type RFC - Proposed Standard (July 2016; Errata)
Updates RFC 7530
Last updated 2016-10-06
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Document shepherd Spencer Shepler
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IESG IESG state RFC 7931 (Proposed Standard)
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Internet Engineering Task Force (IETF)                    D. Noveck, Ed.
Request for Comments: 7931                                           HPE
Updates: 7530                                                  P. Shivam
Category: Standards Track                                       C. Lever
ISSN: 2070-1721                                                 B. Baker
                                                                  ORACLE
                                                               July 2016

                NFSv4.0 Migration: Specification Update

Abstract

   The migration feature of NFSv4 allows the transfer of responsibility
   for a single file system from one server to another without
   disruption to clients.  Recent implementation experience has shown
   problems in the existing specification for this feature in NFSv4.0.
   This document identifies the problem areas and provides revised
   specification text that updates the NFSv4.0 specification in RFC
   7530.

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/rfc7931.

Noveck, et al.               Standards Track                    [Page 1]
RFC 7931         NFSv4.0 Migration Specification Update        July 2016

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.

Noveck, et al.               Standards Track                    [Page 2]
RFC 7931         NFSv4.0 Migration Specification Update        July 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Data Type Definitions . . . . . . . . . . . . . . . . . .   5
   4.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Client Identity Definition  . . . . . . . . . . . . . . . . .   7
     5.1.  Differences from Replaced Sections  . . . . . . . . . . .   7
     5.2.  Client Identity Data Items  . . . . . . . . . . . . . . .   8
       5.2.1.  Client Identity Structure . . . . . . . . . . . . . .   9
       5.2.2.  Client Identity Shorthand . . . . . . . . . . . . . .  11
     5.3.  Server Release of Client ID . . . . . . . . . . . . . . .  13
     5.4.  Client ID String Approaches . . . . . . . . . . . . . . .  14
     5.5.  Non-uniform Client ID String Approach . . . . . . . . . .  16
     5.6.  Uniform Client ID String Approach . . . . . . . . . . . .  16
     5.7.  Mixing Client ID String Approaches  . . . . . . . . . . .  18
     5.8.  Trunking Determination when Using Uniform Client ID
           Strings . . . . . . . . . . . . . . . . . . . . . . . . .  20
     5.9.  Client ID String Construction Details . . . . . . . . . .  26
   6.  Locking and Multi-Server Namespace  . . . . . . . . . . . . .  28
     6.1.  Lock State and File System Transitions  . . . . . . . . .  28
       6.1.1.  Migration and State . . . . . . . . . . . . . . . . .  29
         6.1.1.1.  Migration and Client IDs  . . . . . . . . . . . .  31
         6.1.1.2.  Migration and State Owner Information . . . . . .  32
       6.1.2.  Replication and State . . . . . . . . . . . . . . . .  36
       6.1.3.  Notification of Migrated Lease  . . . . . . . . . . .  36
       6.1.4.  Migration and the lease_time Attribute  . . . . . . .  39
   7.  Server Implementation Considerations  . . . . . . . . . . . .  39
     7.1.  Relation of Locking State Transfer to Other Aspects of
           File System Motion  . . . . . . . . . . . . . . . . . . .  39
     7.2.  Preventing Locking State Modification during Transfer . .  41
   8.  Additional Changes  . . . . . . . . . . . . . . . . . . . . .  44
     8.1.  Summary of Additional Changes from Previous Documents . .  45
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