Using the Parallel NFS (pNFS) SCSI/NVMe Layout
draft-faibish-nfsv4-scsi-nvme-layout-00

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Last updated 2020-07-06
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Network File System Version 4                                 S. Faibish
Internet-Draft January 1, 2020                                  D. Black
Intended status: Informational                                  Dell EMC
Expires: January 6, 2021                                      C. Hellwig
                                                            July 6, 2020
                          

          Using the Parallel NFS (pNFS) SCSI/NVMe Layout 
              draft-faibish-nfsv4-scsi-nvme-layout-00

Abstract

   This document explains how to use the Parallel Network File System 
   (pNFS) SCSI NVMe Layout Types with transports using the 
   NVMe over Fabrics protocols. This draft picks the previous SCSI 
   over NVMe draft of C. Hellwig and extended it to support all the 
   types of transport protocols supported by NVMe transport over fabrics 
   additional to the SCSI transport protocol introduced in pNFS SCSI 
   Layout. The proposed transport protocols include support for 
   several transports and fabrics and support the RDMA transports.
  
Status of This Memo

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Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Faibish                   Expires  January 6, 2021              [Page 1]
Internet-Draft      pNFS SCSI/NVMe Layout over Fabrics         July 2020 

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Table of Contents 

   1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 2 
     1.1. Conventions Used in This Document . . . . . . . . . . . . .  2 
     1.2. General Definitions . . . . . . . . . . . . . . . . . . . .  2 
   2. SCSI Layout mapping to NVMe . . . . . . . . . . . . . . . . . .  3 
     2.1. Volume Identification . . . . . . . . . . . . . . . . . . .  7 
     2.2. Client Fencing  . . . . . . . . . . . . . . . . . . . . . .  7 
       2.2.1. Reservation Key Generation  . . . . . . . . . . . . . .  8 
       2.2.2. MDS Registration and Reservation  . . . . . . . . . . .  8 
       2.2.3. Client Registration . . . . . . . . . . . . . . . . . .  8 
       2.2.4. Fencing Action  . . . . . . . . . . . . . . . . . . . .  8 
       2.2.5. Client Recovery after a Fence Action  . . . . . . . . .  9 
     2.3. Volatile write caches . . . . . . . . . . . . . . . . . . . 10 
   3. Security Considerations . . . . . . . . . . . . . . . . . . . . 10 
   4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 10 
   5. Normative References  . . . . . . . . . . . . . . . . . . . . . 11 
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 11
 
1. Introduction 

   The pNFS Small Computer System Interface (SCSI) layout [RFC8154] is 
   layout type that allows NFS clients to directly perform I/O to block 
   storage devices while bypassing the MDS. It is specified by using 
   concepts from the SCSI protocol family for the data path to the 
   storage devices. This documents explains how to access PCI Express, 
   RDMA or Fibre Channel devices using the NVM Express protocol [NVME] 
   using the SCSI layout. This document does not amend the pNFS SCSI 
   layout document in any way, instead of explains how to map the SCSI 
   constructs used in the pNFS SCSI layout document to NVMe concepts 
   using the NVMe SCSI translation reference. 
 

1.1. Conventions Used in This Document 

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 
   document are to be interpreted as described in [RFC2119]. 
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