Requirements for Parallel NFS (pNFS) Layout Types
RFC 8434
| Document | Type |
RFC - Proposed Standard
(August 2018; No errata)
Updates RFC 5661
|
|
|---|---|---|---|
| Last updated | 2018-08-24 | ||
| Stream | IETF | ||
| Formats | plain text pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Spencer Shepler | ||
| Shepherd write-up | Show (last changed 2018-01-14) | ||
| IESG | IESG state | RFC 8434 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Spencer Dawkins | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | No IANA Actions | ||
Internet Engineering Task Force (IETF) T. Haynes
Request for Comments: 8434 Hammerspace
Updates: 5661 August 2018
Category: Standards Track
ISSN: 2070-1721
Requirements for Parallel NFS (pNFS) Layout Types
Abstract
This document defines the requirements that individual Parallel NFS
(pNFS) layout types need to meet in order to work within the pNFS
framework as defined in RFC 5661. In so doing, this document aims to
clearly distinguish between requirements for pNFS as a whole and
those specifically directed to the pNFS file layout. The lack of a
clear separation between the two sets of requirements has been
troublesome for those specifying and evaluating new layout types. In
this regard, this document updates RFC 5661.
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 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8434.
Copyright Notice
Copyright (c) 2018 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
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
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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.
Haynes Standards Track [Page 1]
RFC 8434 pNFS Layout Types August 2018
Table of Contents
1. Introduction ....................................................2
2. Definitions .....................................................3
2.1. Use of the Terms "Data Server" and "Storage Device" ........5
2.2. Requirements Language ......................................6
3. The Control Protocol ............................................6
3.1. Control Protocol Requirements ..............................8
3.2. Previously Undocumented Protocol Requirements ..............9
3.3. Editorial Requirements ....................................10
4. Specifications of Original Layout Types ........................11
4.1. File Layout Type ..........................................11
4.2. Block Layout Type .........................................12
4.3. Object Layout Type ........................................13
5. Summary ........................................................14
6. Security Considerations ........................................15
7. IANA Considerations ............................................15
8. References .....................................................16
8.1. Normative References ......................................16
8.2. Informative References ....................................16
Acknowledgments ...................................................17
Author's Address ..................................................17
1. Introduction
The concept of "layout type" has a central role in the definition and
implementation of Parallel NFS (pNFS) (see [RFC5661]). Clients and
servers implementing different layout types behave differently in
many ways while conforming to the overall pNFS framework defined in
[RFC5661] and this document. Layout types may differ as to:
o The method used to do I/O operations directed to data storage
devices.
o The requirements for communication between the metadata server
(MDS) and the storage devices.
o The means used to ensure that I/O requests are only processed when
the client holds an appropriate layout.
o The format and interpretation of nominally opaque data fields in
pNFS-related NFSv4.x data structures.
Each layout type will define the needed details for its usage in the
specification for that layout type; layout type specifications are
always Standards Track RFCs. Except for the file layout type defined
Haynes Standards Track [Page 2]
RFC 8434 pNFS Layout Types August 2018
in Section 13 of [RFC5661], existing layout types are defined in
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