Object-Based Parallel NFS (pNFS) Operations
RFC 5664
Document | Type | RFC - Proposed Standard (January 2010; Errata) | |
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Authors | Brent Welch , Jim Zelenka , Benny Halevy | ||
Last updated | 2015-10-14 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5664 (Proposed Standard) | |
Action Holders |
(None)
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||
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Lars Eggert | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) B. Halevy Request for Comments: 5664 B. Welch Category: Standards Track J. Zelenka ISSN: 2070-1721 Panasas January 2010 Object-Based Parallel NFS (pNFS) Operations 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, a.k.a. 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 Object-Based pNFS Layout Type as a companion to the main NFSv4 Minor version 1 specification. Status of This Memo This is an Internet Standards Track document. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc5664. Halevy, et al. Standards Track [Page 1] RFC 5664 pNFS Objects January 2010 Copyright Notice Copyright (c) 2010 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 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. Requirements Language ......................................4 2. XDR Description of the Objects-Based Layout Protocol ............4 2.1. Code Components Licensing Notice ...........................4 3. Basic Data Type Definitions .....................................6 3.1. pnfs_osd_objid4 ............................................6 3.2. pnfs_osd_version4 ..........................................6 3.3. pnfs_osd_object_cred4 ......................................7 3.4. pnfs_osd_raid_algorithm4 ...................................8 4. Object Storage Device Addressing and Discovery ..................8 4.1. pnfs_osd_targetid_type4 ...................................10 4.2. pnfs_osd_deviceaddr4 ......................................10 4.2.1. SCSI Target Identifier .............................11 4.2.2. Device Network Address .............................11 5. Object-Based Layout ............................................12 5.1. pnfs_osd_data_map4 ........................................13 5.2. pnfs_osd_layout4 ..........................................14 5.3. Data Mapping Schemes ......................................14 5.3.1. Simple Striping ....................................15 5.3.2. Nested Striping ....................................16 5.3.3. Mirroring ..........................................17 5.4. RAID Algorithms ...........................................18 5.4.1. PNFS_OSD_RAID_0 ....................................18 5.4.2. PNFS_OSD_RAID_4 ....................................18 5.4.3. PNFS_OSD_RAID_5 ....................................18 5.4.4. PNFS_OSD_RAID_PQ ...................................19 5.4.5. RAID Usage and Implementation Notes ................19 6. Object-Based Layout Update .....................................20 6.1. pnfs_osd_deltaspaceused4 ..................................20 6.2. pnfs_osd_layoutupdate4 ....................................21 7. Recovering from Client I/O Errors ..............................21Show full document text