Parallel NFS (pNFS) SCSI Layout
draft-ietf-nfsv4-scsi-layout-10

Document Type Active Internet-Draft (nfsv4 WG)
Last updated 2017-03-02 (latest revision 2016-12-06)
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NFSv4                                                         C. Hellwig
Internet-Draft
Intended status: Standards Track                       December 05, 2016
Expires: June 8, 2017

                    Parallel NFS (pNFS) SCSI Layout
                  draft-ietf-nfsv4-scsi-layout-10.txt

Abstract

   The Parallel Network File System (pNFS) allows a separation between
   the metadata (onto a metadata server) and data (onto a storage
   device) for a file.  The SCSI Layout Type is defined in this document
   as an extension to pNFS to allow the use SCSI based block storage
   devices.

Status of This Memo

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

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   This Internet-Draft will expire on June 8, 2017.

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
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   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.

Hellwig                   Expires June 8, 2017                  [Page 1]
Internet-Draft              pNFS SCSI Layout               December 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   4
     1.2.  General Definitions . . . . . . . . . . . . . . . . . . .   4
     1.3.  Code Components Licensing Notice  . . . . . . . . . . . .   4
     1.4.  XDR Description . . . . . . . . . . . . . . . . . . . . .   5
   2.  SCSI Layout Description . . . . . . . . . . . . . . . . . . .   6
     2.1.  Background and Architecture . . . . . . . . . . . . . . .   6
     2.2.  layouttype4 . . . . . . . . . . . . . . . . . . . . . . .   8
     2.3.  GETDEVICEINFO . . . . . . . . . . . . . . . . . . . . . .   8
       2.3.1.  Volume Identification . . . . . . . . . . . . . . . .   8
       2.3.2.  Volume Topology . . . . . . . . . . . . . . . . . . .   9
     2.4.  Data Structures: Extents and Extent Lists . . . . . . . .  12
       2.4.1.  Layout Requests and Extent Lists  . . . . . . . . . .  14
       2.4.2.  Layout Commits  . . . . . . . . . . . . . . . . . . .  15
       2.4.3.  Layout Returns  . . . . . . . . . . . . . . . . . . .  16
       2.4.4.  Layout Revocation . . . . . . . . . . . . . . . . . .  16
       2.4.5.  Client Copy-on-Write Processing . . . . . . . . . . .  17
       2.4.6.  Extents are Permissions . . . . . . . . . . . . . . .  18
       2.4.7.  Partial-Block Updates . . . . . . . . . . . . . . . .  19
       2.4.8.  End-of-file Processing  . . . . . . . . . . . . . . .  19
       2.4.9.  Layout Hints  . . . . . . . . . . . . . . . . . . . .  20
       2.4.10. Client Fencing  . . . . . . . . . . . . . . . . . . .  20
     2.5.  Crash Recovery Issues . . . . . . . . . . . . . . . . . .  22
     2.6.  Recalling Resources: CB_RECALL_ANY  . . . . . . . . . . .  22
     2.7.  Transient and Permanent Errors  . . . . . . . . . . . . .  23
     2.8.  Volatile write caches . . . . . . . . . . . . . . . . . .  23
   3.  Enforcing NFSv4 Semantics . . . . . . . . . . . . . . . . . .  24
     3.1.  Use of Open Stateids  . . . . . . . . . . . . . . . . . .  24
     3.2.  Enforcing Security Restrictions . . . . . . . . . . . . .  25
     3.3.  Enforcing Locking Restrictions  . . . . . . . . . . . . .  25
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  26
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  27
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .  27
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . .  28
   Appendix B.  RFC Editor Notes . . . . . . . . . . . . . . . . . .  28
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  29

1.  Introduction
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