Support for Data Reduction Extended Attributes in nfsv4 Version 2
draft-faibish-data-reduction-xattrs-pvt-00

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Last updated 2019-06-28
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Network File System Version 4                                 S. Faibish
Internet-Draft                                                  D. Black
Intended status: Informational                                P. Shilane
Expires: December 25, 2019                                      Dell EMC
                                                           June 27, 2019
                          

    Support for Data Reduction Extended Attributes in nfsv4 Version 2
                draft-faibish-data-reduction-xattrs-pvt-00

Abstract

   This document proposes extending NFSv4 operations to enable
   file extended attributes or xattr to be used in the protocol to 
   provide information about the data reduction properties of files. 
   New xattrs are proposed to allow the client application to 
   communicate to the NFSv4 server data reduction attributes 
   associated with files and directories using opaque metadata, not 
   interpreted by the file system, but communicated to the Block 
   Storage data reduction engines. Corresponding new file attributes 
   are proposed to allow clients and client applications to query the 
   server for data reduction xattr support and allow to get and set 
   data reduction xattrs on files and directories. Such data reduction 
   metadata is used as hints to the file server about what type of data 
   reduction to apply. The proposed data reduction attributes include 
   achievable ratios for compression and deduplication plus whether 
   each data reduction technique applies to the file.       

Status of This Memo

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Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Faibish                   Expires December 27, 2019             [Page 1]
Internet-Draft    Data Reduction Extended Attributes in NFSv4  June 2019

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Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3. Extended Attributes . . . . . . . . . . . . . . . . . . . . .   6
   4. File System Support . . . . . . . . . . . . . . . . . . . . .   9
   5. Namespaces  . . . . . . . . . . . . . . . . . . . . . . . . .   9
   6  Differences with Named Attributes . . . . . . . . . . . . . .   9
   7  Protocol Enhancements . . . . . . . . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
   9.  Security Considerations . . . . . . . . . . . . . . . . . . . 10
   10.  References  . . . . . . . . . . . . . . . . . . . . . . . .  11
        10.1.  Normative References . . . . . . . . . . . . . . . .  11
        10.2  Informative References . . . . . . . . . . . . . . . . 11
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 12
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . 12

1. Introduction

   Many NFS servers use expensive solid state media, e.g., NVMe SSDs, 
   complemented by data reduction processing of files to reduce their 
   size on the Block Storage via compression and deduplication, thereby 
   optimizing media usage. This draft considers scenarios in which 
   data reduction processing is performed in Block Storage for NFS 
   servers, i.e., compression and deduplication processing occurs in 
   the background or inline as a consequence of NFS files being 
   written to the Block Storage. In these scenarios, the data reduction 
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