NFSv4.0 Migration: Specification Update
RFC 7931
| Document | Type |
RFC - Proposed Standard
(July 2016; Errata)
Updates RFC 7530
|
|
|---|---|---|---|
| Authors | David Noveck , Piyush Shivam , Chuck Lever , Bill Baker | ||
| Last updated | 2016-10-06 | ||
| 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 2015-09-27) | ||
| IESG | IESG state | RFC 7931 (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) D. Noveck, Ed.
Request for Comments: 7931 HPE
Updates: 7530 P. Shivam
Category: Standards Track C. Lever
ISSN: 2070-1721 B. Baker
ORACLE
July 2016
NFSv4.0 Migration: Specification Update
Abstract
The migration feature of NFSv4 allows the transfer of responsibility
for a single file system from one server to another without
disruption to clients. Recent implementation experience has shown
problems in the existing specification for this feature in NFSv4.0.
This document identifies the problem areas and provides revised
specification text that updates the NFSv4.0 specification in RFC
7530.
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
http://www.rfc-editor.org/info/rfc7931.
Noveck, et al. Standards Track [Page 1]
RFC 7931 NFSv4.0 Migration Specification Update July 2016
Copyright Notice
Copyright (c) 2016 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.
Noveck, et al. Standards Track [Page 2]
RFC 7931 NFSv4.0 Migration Specification Update July 2016
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
3.2. Data Type Definitions . . . . . . . . . . . . . . . . . . 5
4. Background . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Client Identity Definition . . . . . . . . . . . . . . . . . 7
5.1. Differences from Replaced Sections . . . . . . . . . . . 7
5.2. Client Identity Data Items . . . . . . . . . . . . . . . 8
5.2.1. Client Identity Structure . . . . . . . . . . . . . . 9
5.2.2. Client Identity Shorthand . . . . . . . . . . . . . . 11
5.3. Server Release of Client ID . . . . . . . . . . . . . . . 13
5.4. Client ID String Approaches . . . . . . . . . . . . . . . 14
5.5. Non-uniform Client ID String Approach . . . . . . . . . . 16
5.6. Uniform Client ID String Approach . . . . . . . . . . . . 16
5.7. Mixing Client ID String Approaches . . . . . . . . . . . 18
5.8. Trunking Determination when Using Uniform Client ID
Strings . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.9. Client ID String Construction Details . . . . . . . . . . 26
6. Locking and Multi-Server Namespace . . . . . . . . . . . . . 28
6.1. Lock State and File System Transitions . . . . . . . . . 28
6.1.1. Migration and State . . . . . . . . . . . . . . . . . 29
6.1.1.1. Migration and Client IDs . . . . . . . . . . . . 31
6.1.1.2. Migration and State Owner Information . . . . . . 32
6.1.2. Replication and State . . . . . . . . . . . . . . . . 36
6.1.3. Notification of Migrated Lease . . . . . . . . . . . 36
6.1.4. Migration and the lease_time Attribute . . . . . . . 39
7. Server Implementation Considerations . . . . . . . . . . . . 39
7.1. Relation of Locking State Transfer to Other Aspects of
File System Motion . . . . . . . . . . . . . . . . . . . 39
7.2. Preventing Locking State Modification during Transfer . . 41
8. Additional Changes . . . . . . . . . . . . . . . . . . . . . 44
8.1. Summary of Additional Changes from Previous Documents . . 45
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