Parallel NFS (pNFS) SCSI Layout
draft-ietf-nfsv4-scsi-layout-03
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Christoph Hellwig
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2015-11-03
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NFSv4 C. Hellwig
Internet-Draft November 03, 2015
Intended status: Standards Track
Expires: May 6, 2016
Parallel NFS (pNFS) SCSI Layout
draft-ietf-nfsv4-scsi-layout-03.txt
Abstract
The Parallel Network File System (pNFS) allows a separation between
the metadata (onto a metadata server) and data (onto a storage
device) for a file. The SCSI Layout Type is defined in this document
as an extension to pNFS to allow the use SCSI based block 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 May 6, 2016.
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
(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.
Hellwig Expires May 6, 2016 [Page 1]
Internet-Draft pNFS SCSI Layout November 2015
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Conventions Used in This Document . . . . . . . . . . . . 4
1.2. General Definitions . . . . . . . . . . . . . . . . . . . 4
1.3. Code Components Licensing Notice . . . . . . . . . . . . . 4
1.4. XDR Description . . . . . . . . . . . . . . . . . . . . . 4
2. SCSI Layout Description . . . . . . . . . . . . . . . . . . . 6
2.1. Background and Architecture . . . . . . . . . . . . . . . 6
2.2. layouttype4 . . . . . . . . . . . . . . . . . . . . . . . 7
2.3. GETDEVICEINFO . . . . . . . . . . . . . . . . . . . . . . 8
2.3.1. Volume Identification . . . . . . . . . . . . . . . . 8
2.3.2. Volume Topology . . . . . . . . . . . . . . . . . . . 9
2.4. Data Structures: Extents and Extent Lists . . . . . . . . 12
2.4.1. Layout Requests and Extent Lists . . . . . . . . . . . 14
2.4.2. Layout Commits . . . . . . . . . . . . . . . . . . . . 16
2.4.3. Layout Returns . . . . . . . . . . . . . . . . . . . . 16
2.4.4. Client Copy-on-Write Processing . . . . . . . . . . . 17
2.4.5. Extents are Permissions . . . . . . . . . . . . . . . 18
2.4.6. End-of-file Processing . . . . . . . . . . . . . . . . 19
2.4.7. Layout Hints . . . . . . . . . . . . . . . . . . . . . 20
2.4.8. Client Fencing . . . . . . . . . . . . . . . . . . . . 20
2.5. Crash Recovery Issues . . . . . . . . . . . . . . . . . . 22
2.6. Recalling Resources: CB_RECALL_ANY . . . . . . . . . . . . 22
2.7. Transient and Permanent Errors . . . . . . . . . . . . . . 23
2.8. Volatile write caches . . . . . . . . . . . . . . . . . . 23
3. Enforcing NFSv4 Semantics . . . . . . . . . . . . . . . . . . 24
3.1. Use of Open Stateids . . . . . . . . . . . . . . . . . . . 24
3.2. Enforcing Security Restrictions . . . . . . . . . . . . . 25
3.3. Enforcing Locking Restrictions . . . . . . . . . . . . . . 25
4. Security Considerations . . . . . . . . . . . . . . . . . . . 26
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 27
6. Normative References . . . . . . . . . . . . . . . . . . . . . 27
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . . 28
Appendix B. RFC Editor Notes . . . . . . . . . . . . . . . . . . 28
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 29
Hellwig Expires May 6, 2016 [Page 2]
Internet-Draft pNFS SCSI Layout November 2015
1. Introduction
Figure 1 shows the overall architecture of a Parallel NFS (pNFS)
system:
+-----------+
|+-----------+ +-----------+
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