Requirements for Parallel NFS (pNFS) Layout Types
RFC 8434
Document | Type |
RFC - Proposed Standard
(August 2018; No errata)
Updates RFC 5661
|
|
---|---|---|---|
Author | Thomas Haynes | ||
Last updated | 2018-08-24 | ||
Stream | IETF | ||
Formats | plain text html 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 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. 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 inShow full document text