NFSv4 migration: Implementation Experience and Specification Issues
draft-ietf-nfsv4-migration-issues-12

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Last updated 2017-03-30
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NFSv4                                                     D. Noveck, Ed.
Internet-Draft                                                    NetApp
Intended status: Informational                                 P. Shivam
Expires: September 30, 2017                                     C. Lever
                                                                B. Baker
                                                                  ORACLE
                                                          March 29, 2017

  NFSv4 migration: Implementation Experience and Specification Issues
                  draft-ietf-nfsv4-migration-issues-12

Abstract

   The migration feature of NFSv4 provides for moving responsibility for
   a single filesystem from one server to another, without disruption to
   clients.  A number of problems in the specification of this feature
   in NFSv4.0 were resolved by the publication of RFC 7931.  In
   addition, there are specification issues to be resolved with regard
   to the NFSv4.1 version of this feature which are discussed in this
   document.

Status of This Memo

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   This Internet-Draft will expire on September 30, 2017.

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   Copyright (c) 2017 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

Noveck, et al.         Expires September 30, 2017               [Page 1]
Internet-Draft              nfsv4-migr-issues                 March 2017

   carefully, as they describe your rights and restrictions with respect
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  NFSv4.0 Issues and Their Resolution . . . . . . . . . . . . .   3
     3.1.  NFSv4.0 Issues  . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Resolution of NFSv4.0 Protocol Difficulties . . . . . . .   4
   4.  Issues for NFSv4.1  . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Issues to Address for NFSv4.1 . . . . . . . . . . . . . .   5
       4.1.1.  Addressing state merger in NFSv4.1  . . . . . . . . .   6
       4.1.2.  Addressing pNFS relationship with migration . . . . .   7
       4.1.3.  Addressing server_owner changes in NFSv4.1  . . . . .   7
       4.1.4.  Addressing Confirmation Status of Migrated
               Client IDs in NFSv4.1 . . . . . . . . . . . . . . . .   8
       4.1.5.  Addressing Session Migration in NFSv4.1 . . . . . . .   9
     4.2.  Possible Resolutions for NFSv4.1 Issues . . . . . . . . .   9
       4.2.1.  Server Responsibilities in Effecting Transparent
               State Migration . . . . . . . . . . . . . . . . . . .  10
       4.2.2.  Determining Initial Migration Status in NFSv4.1 . . .  11
       4.2.3.  Client Response to Migration in NFSv4.1 . . . . . . .  13
       4.2.4.  Dealing with Multiple Location Entries  . . . . . . .  13
       4.2.5.  Client Recovery from Migration Events . . . . . . . .  15
       4.2.6.  The Migration Discovery Process . . . . . . . . . . .  18
       4.2.7.  Synchronzing Session Transfer . . . . . . . . . . . .  19
       4.2.8.  Migration and pNFS  . . . . . . . . . . . . . . . . .  22
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  23
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  23
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .  23
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  23
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  24

1.  Introduction

   This document. which deals with existing issues/problems in
   standards-track documents, is in the informational category, and
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