Parallel NFS (pNFS) Block/Volume Layout
RFC 5663
| Document | Type |
RFC - Proposed Standard
(January 2010; Errata)
Updated by RFC 6688
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf htmlized with errata bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 5663 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Lars Eggert | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) D. Black
Request for Comments: 5663 S. Fridella
Category: Standards Track EMC Corporation
ISSN: 2070-1721 J. Glasgow
Google
January 2010
Parallel NFS (pNFS) Block/Volume Layout
Abstract
Parallel NFS (pNFS) extends Network File Sharing 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. The main pNFS operations document
specifies storage-class-independent extensions to NFS; this document
specifies the additional extensions (primarily data structures) for
use of pNFS with block- and volume-based storage.
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/rfc5663.
Black, et al. Standards Track [Page 1]
RFC 5663 pNFS Block/Volume Layout 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.
Black, et al. Standards Track [Page 2]
RFC 5663 pNFS Block/Volume Layout January 2010
Table of Contents
1. Introduction ....................................................4
1.1. Conventions Used in This Document ..........................4
1.2. General Definitions ........................................5
1.3. Code Components Licensing Notice ...........................5
1.4. XDR Description ............................................5
2. Block Layout Description ........................................7
2.1. Background and Architecture ................................7
2.2. GETDEVICELIST and GETDEVICEINFO ............................9
2.2.1. Volume Identification ...............................9
2.2.2. Volume Topology ....................................10
2.2.3. GETDEVICELIST and GETDEVICEINFO deviceid4 ..........12
2.3. Data Structures: Extents and Extent Lists .................12
2.3.1. Layout Requests and Extent Lists ...................15
2.3.2. Layout Commits .....................................16
2.3.3. Layout Returns .....................................16
2.3.4. Client Copy-on-Write Processing ....................17
2.3.5. Extents are Permissions ............................18
2.3.6. End-of-file Processing .............................20
2.3.7. Layout Hints .......................................20
2.3.8. Client Fencing .....................................21
2.4. Crash Recovery Issues .....................................23
2.5. Recalling Resources: CB_RECALL_ANY ........................23
2.6. Transient and Permanent Errors ............................24
3. Security Considerations ........................................24
4. Conclusions ....................................................26
5. IANA Considerations ............................................26
6. Acknowledgments ................................................26
7. References .....................................................27
7.1. Normative References ......................................27
7.2. Informative References ....................................27
Black, et al. Standards Track [Page 3]
Show full document text