Parallel NFS (pNFS) Flexible File Layout
draft-ietf-nfsv4-flex-files-02

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Last updated 2014-10-07
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NFSv4                                                          B. Halevy
Internet-Draft                                                 T. Haynes
Intended status: Informational                              Primary Data
Expires: April 10, 2015                                 October 07, 2014

                Parallel NFS (pNFS) Flexible File Layout
                   draft-ietf-nfsv4-flex-files-02.txt

Abstract

   The Parallel Network File System (pNFS) allows a separation between
   the metadata and data for a file.  The metadata file access is
   handled via Network File System version 4 (NFSv4) minor version 1
   (NFSv4.1) and the data file access is specific to the protocol being
   used between the client and storage device.  The client is informed
   by the metadata server as to which protocol to use via a Layout Type.
   The Flexible File Layout Type is defined in this document as an
   extension to NFSv4.1 to allow the use of storage devices which need
   not be tightly coupled to the metadata server.

Status of This Memo

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   This Internet-Draft will expire on April 10, 2015.

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   Copyright (c) 2014 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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Halevy & Haynes          Expires April 10, 2015                 [Page 1]
Internet-Draft              Flex File Layout                October 2014

   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.  Definitions . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Difference Between a Data Server and a Storage Device . .   5
     1.3.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  Coupling of Storage Devices . . . . . . . . . . . . . . . . .   5
     2.1.  LAYOUTCOMMIT  . . . . . . . . . . . . . . . . . . . . . .   6
     2.2.  Security Models . . . . . . . . . . . . . . . . . . . . .   6
     2.3.  State and Locking Models  . . . . . . . . . . . . . . . .   6
   3.  XDR Description of the Flexible File Layout Type  . . . . . .   7
     3.1.  Code Components Licensing Notice  . . . . . . . . . . . .   8
   4.  Device Addressing and Discovery . . . . . . . . . . . . . . .   9
     4.1.  ff_device_addr  . . . . . . . . . . . . . . . . . . . . .   9
     4.2.  Storage Device Multipathing . . . . . . . . . . . . . . .  10
   5.  Flexible File Layout Type . . . . . . . . . . . . . . . . . .  11
     5.1.  ff_layout4  . . . . . . . . . . . . . . . . . . . . . . .  12
   6.  Striping via Sparse Mapping . . . . . . . . . . . . . . . . .  14
   7.  Recovering from Client I/O Errors . . . . . . . . . . . . . .  14
   8.  Mirroring . . . . . . . . . . . . . . . . . . . . . . . . . .  15
     8.1.  Selecting a Mirror  . . . . . . . . . . . . . . . . . . .  15
     8.2.  Writing to Mirrors  . . . . . . . . . . . . . . . . . . .  16
     8.3.  Metadata Server Resilvering of the File . . . . . . . . .  16
   9.  Flexible Files Layout Type Return . . . . . . . . . . . . . .  16
     9.1.  ff_ioerr  . . . . . . . . . . . . . . . . . . . . . . . .  17
     9.2.  ff_iostats  . . . . . . . . . . . . . . . . . . . . . . .  18
     9.3.  ff_layoutreturn . . . . . . . . . . . . . . . . . . . . .  19
   10. Flexible Files Layout Type LAYOUTERROR  . . . . . . . . . . .  19
   11. Flexible Files Layout Type LAYOUTSTATS  . . . . . . . . . . .  19
   12. Flexible File Layout Type Creation Hint . . . . . . . . . . .  20
     12.1.  ff_layouthint4 . . . . . . . . . . . . . . . . . . . . .  20
   13. Recalling Layouts . . . . . . . . . . . . . . . . . . . . . .  20
     13.1.  CB_RECALL_ANY  . . . . . . . . . . . . . . . . . . . . .  21
   14. Client Fencing  . . . . . . . . . . . . . . . . . . . . . . .  21
   15. Security Considerations . . . . . . . . . . . . . . . . . . .  22
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