Parallel NFS (pNFS) Flexible Files Layout
draft-bhalevy-nfsv4-flex-files-02

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NFSv4                                                          B. Halevy
Internet-Draft                                                 T. Haynes
Intended status: Informational                              Primary Data
Expires: October 19, 2014                                 April 17, 2014

               Parallel NFS (pNFS) Flexible Files Layout
                 draft-bhalevy-nfsv4-flex-files-02.txt

Abstract

   Parallel NFS (pNFS) extends Network File System version 4 (NFSv4) 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, i.e., the Layout Type.  The main pNFS
   operations and data types in NFSv4 Minor version 1 specify a layout-
   type-independent layer; layout-type-specific information is conveyed
   using opaque data structures whose internal structure is further
   defined by the particular layout type specification.  This document
   specifies the NFSv4.1 Flexible Files pNFS Layout as a companion to
   the main NFSv4 Minor version 1 specification for use of pNFS with
   Data Servers over NFSv4 or higher minor versions using flexible, per-
   file striping topology.

Status of This Memo

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   This Internet-Draft will expire on October 19, 2014.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Halevy & Haynes         Expires October 19, 2014                [Page 1]
Internet-Draft              Flex Files Layout                 April 2014

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Method of Operation . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Security models . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  State and Locking Models  . . . . . . . . . . . . . . . .   4
   3.  XDR Description of the Flexible Files Layout Protocol . . . .   5
     3.1.  Code Components Licensing Notice  . . . . . . . . . . . .   5
   4.  Device Addressing and Discovery . . . . . . . . . . . . . . .   7
     4.1.  pnfs_ff_device_addr . . . . . . . . . . . . . . . . . . .   7
     4.2.  Data Server Multipathing  . . . . . . . . . . . . . . . .   8
   5.  Flexible Files Layout . . . . . . . . . . . . . . . . . . . .   9
     5.1.  pnfs_ff_layout  . . . . . . . . . . . . . . . . . . . . .   9
     5.2.  Striping Topologies . . . . . . . . . . . . . . . . . . .  13
       5.2.1.  PFSP_SPARSE_STRIPING  . . . . . . . . . . . . . . . .  13
       5.2.2.  PFSP_DENSE_STRIPING . . . . . . . . . . . . . . . . .  14
       5.2.3.  PFSP_RAID_4 . . . . . . . . . . . . . . . . . . . . .  15
       5.2.4.  PFSP_RAID_5 . . . . . . . . . . . . . . . . . . . . .  15
       5.2.5.  PFSP_RAID_PQ  . . . . . . . . . . . . . . . . . . . .  16
       5.2.6.  RAID Usage and Implementation Notes . . . . . . . . .  17
     5.3.  Mirroring . . . . . . . . . . . . . . . . . . . . . . . .  17
   6.  Recovering from Client I/O Errors . . . . . . . . . . . . . .  17
   7.  Flexible Files Layout Return  . . . . . . . . . . . . . . . .  18
     7.1.  pflr_errno  . . . . . . . . . . . . . . . . . . . . . . .  19
     7.2.  pnfs_ff_ioerr . . . . . . . . . . . . . . . . . . . . . .  20
     7.3.  pnfs_ff_iostats . . . . . . . . . . . . . . . . . . . . .  21
     7.4.  pnfs_ff_layoutreturn  . . . . . . . . . . . . . . . . . .  22
   8.  Flexible Files Creation Layout Hint . . . . . . . . . . . . .  22
     8.1.  pnfs_ff_layouthint  . . . . . . . . . . . . . . . . . . .  22
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