Parallel NFS (pNFS) SCSI Layout
draft-ietf-nfsv4-scsi-layout-00

The information below is for an old version of the document
Document Type Active Internet-Draft (nfsv4 WG)
Last updated 2015-04-25
Stream IETF
Intended RFC status (None)
Formats pdf htmlized bibtex
Reviews
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)
NFSv4                                                         C. Hellwig
Internet-Draft                                            April 25, 2015
Intended status: Standards Track
Expires: October 27, 2015

                    Parallel NFS (pNFS) SCSI Layout
                  draft-ietf-nfsv4-scsi-layout-00.txt

Abstract

   Parallel NFS (pNFS) extends Network File Sharing version 4 (RFC5661)
   to allow clients to directly access file data on the storage used by
   the NFSv4 server.  This ability to bypass the server for data access
   can increase both performance and parallelism, but requires
   additional client functionality for data access, some of which is
   dependent on the class of storage used.  The main pNFS operations
   document specifies storage-class-independent extensions to NFS, the
   pNFS Block/Volume Layout (RFC5663) specifies the additional
   extensions for use of pNFS with block-and volume-based storage, while
   this document provides extensions to the pNFS Block/Volume Layout
   document to provide reliable fencing and better device
   discoverability for SCSI based shared storage devices.

Status of this Memo

   This Internet-Draft is submitted 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/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on October 27, 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

Hellwig                 Expires October 27, 2015                [Page 1]
Internet-Draft              pNFS SCSI Layout                  April 2015

   (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.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Scope  . . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2.  Conventions Used in This Document  . . . . . . . . . . . .  3
     1.3.  Code Components Licensing Notice . . . . . . . . . . . . .  3
     1.4.  XDR Description  . . . . . . . . . . . . . . . . . . . . .  3
   2.  SCSI Layout Description  . . . . . . . . . . . . . . . . . . .  5
     2.1.  GETDEVICEINFO  . . . . . . . . . . . . . . . . . . . . . .  6
       2.1.1.  Model  . . . . . . . . . . . . . . . . . . . . . . . .  6
       2.1.2.  Volume Identification  . . . . . . . . . . . . . . . .  7
       2.1.3.  Volume Topology  . . . . . . . . . . . . . . . . . . .  7
     2.2.  Client Fencing . . . . . . . . . . . . . . . . . . . . . .  9
       2.2.1.  PRs - Key Generation . . . . . . . . . . . . . . . . .  9
       2.2.2.  PRs - MDS Registration and Reservation . . . . . . . .  9
       2.2.3.  PRs - Client Registration  . . . . . . . . . . . . . .  9
       2.2.4.  PRs - Fencing Action . . . . . . . . . . . . . . . . . 10
       2.2.5.  Client Recovery After a Fence Action . . . . . . . . . 10
   3.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   4.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 11
   5.  Normative References . . . . . . . . . . . . . . . . . . . . . 11
   Appendix A.  Acknowledgments . . . . . . . . . . . . . . . . . . . 11
   Appendix B.  RFC Editor Notes  . . . . . . . . . . . . . . . . . . 12
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 12

Hellwig                 Expires October 27, 2015                [Page 2]
Internet-Draft              pNFS SCSI Layout                  April 2015

1.  Introduction

   In the parallel Network File System (pNFS), the metadata server
   returns Layout Type structures that describe where file data is
   located.  There are different Layout Types for different storage
   systems and methods of arranging data on storage devices.  This
   document extends the pNFS Block/Volume Layout [RFC5663] with a closer
   integration into the the SCSI Architecture Model ([SAM-4]) to provide
   a generic fencing method and more scalable device discovery.

1.1.  Scope
Show full document text