Parallel NFS (pNFS) SCSI Layout
draft-ietf-nfsv4-scsi-layout-00
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Christoph Hellwig
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2015-04-25
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NFSv4 C. Hellwig
Internet-Draft April 25, 2015
Intended status: Standards Track
Expires: October 27, 2015
Parallel NFS (pNFS) SCSI Layout
draft-ietf-nfsv4-scsi-layout-00.txt
Abstract
Parallel NFS (pNFS) extends Network File Sharing version 4 (RFC5661)
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, the
pNFS Block/Volume Layout (RFC5663) specifies the additional
extensions for use of pNFS with block-and volume-based storage, while
this document provides extensions to the pNFS Block/Volume Layout
document to provide reliable fencing and better device
discoverability for SCSI based shared storage devices.
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 October 27, 2015.
Copyright Notice
Copyright (c) 2015 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
Hellwig Expires October 27, 2015 [Page 1]
Internet-Draft pNFS SCSI Layout April 2015
(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. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Conventions Used in This Document . . . . . . . . . . . . 3
1.3. Code Components Licensing Notice . . . . . . . . . . . . . 3
1.4. XDR Description . . . . . . . . . . . . . . . . . . . . . 3
2. SCSI Layout Description . . . . . . . . . . . . . . . . . . . 5
2.1. GETDEVICEINFO . . . . . . . . . . . . . . . . . . . . . . 6
2.1.1. Model . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.2. Volume Identification . . . . . . . . . . . . . . . . 7
2.1.3. Volume Topology . . . . . . . . . . . . . . . . . . . 7
2.2. Client Fencing . . . . . . . . . . . . . . . . . . . . . . 9
2.2.1. PRs - Key Generation . . . . . . . . . . . . . . . . . 9
2.2.2. PRs - MDS Registration and Reservation . . . . . . . . 9
2.2.3. PRs - Client Registration . . . . . . . . . . . . . . 9
2.2.4. PRs - Fencing Action . . . . . . . . . . . . . . . . . 10
2.2.5. Client Recovery After a Fence Action . . . . . . . . . 10
3. Security Considerations . . . . . . . . . . . . . . . . . . . 10
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
5. Normative References . . . . . . . . . . . . . . . . . . . . . 11
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . . 11
Appendix B. RFC Editor Notes . . . . . . . . . . . . . . . . . . 12
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 12
Hellwig Expires October 27, 2015 [Page 2]
Internet-Draft pNFS SCSI Layout April 2015
1. Introduction
In the parallel Network File System (pNFS), the metadata server
returns Layout Type structures that describe where file data is
located. There are different Layout Types for different storage
systems and methods of arranging data on storage devices. This
document extends the pNFS Block/Volume Layout [RFC5663] with a closer
integration into the the SCSI Architecture Model ([SAM-4]) to provide
a generic fencing method and more scalable device discovery.
1.1. Scope
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