Requirements for pNFS Layout Types
draft-ietf-nfsv4-layout-types-00
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Thomas Haynes
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2014-07-14
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NFSv4 T. Haynes
Internet-Draft Primary Data
Updates: 5661 (if approved) May 16, 2014
Intended status: Informational
Expires: November 17, 2014
Requirements for pNFS Layout Types
draft-ietf-nfsv4-layout-types-00.txt
Abstract
This document provides help in distinguishing between the
requirements for Network File System (NFS) version 4.1's Parallel NFS
(pNFS) and those those specifically directed to the pNFS File Layout.
The lack of a clear separation between the two set of requirements
has been troublesome for those specifying and evaluating new Layout
Types.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 17, 2014.
Copyright Notice
Copyright (c) 2014 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
Haynes Expires November 17, 2014 [Page 1]
Internet-Draft Layout Types May 2014
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Difference Between a Data Server and a Storage Device . . 4
2.2. Requirements Language . . . . . . . . . . . . . . . . . . 4
3. The Control Protocol . . . . . . . . . . . . . . . . . . . . 4
3.1. Protocol Requirements . . . . . . . . . . . . . . . . . . 5
3.2. Non-protocol Requirements . . . . . . . . . . . . . . . . 6
3.3. Editorial Requirements . . . . . . . . . . . . . . . . . 6
4. Implementations in Existing Layout Types . . . . . . . . . . 7
4.1. File Layout Type . . . . . . . . . . . . . . . . . . . . 7
4.2. Block Layout Type . . . . . . . . . . . . . . . . . . . . 7
4.3. Object Layout Type . . . . . . . . . . . . . . . . . . . 8
5. Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.1. Normative References . . . . . . . . . . . . . . . . . . 10
8.2. Informative References . . . . . . . . . . . . . . . . . 10
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . 10
Appendix B. RFC Editor Notes . . . . . . . . . . . . . . . . . . 10
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
Both Parallel Network File System (pNFS) and the File Layout Type
were defined in the Network File System (NFS) version 4.1 protocol
specification, [RFC5661]. The Block Layout Type was defined in
[RFC5663] and the Object Layout Type was in turn defined in
[RFC5664].
Some implementers have interpreted the text in Sections 12 ("Parallel
NFS (pNFS)") and 13 ("NFSv4.1 as a Storage Protocol in pNFS: the File
Layout Type") of [RFC5661] as both being strictly for the File Layout
Type. I.e., since Section 13 was not covered in a separate RFC like
those for both the Block and Object Layout Types, there is some
confusion as to the responsibilities of both the Metadata Server
(MDS) and the Data Servers (DS) which were laid out in Section 12.
As a consequence, new internet drafts (see [FlexFiles] and [Lustre])
may struggle to meet the requirements to be a pNFS Layout Type. This
document clarifies what are the Layout Type independent requirements
placed on all Layout Types, whether one of the original three or any
new variant.
Haynes Expires November 17, 2014 [Page 2]
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