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File Access and Protocols Feature Guide 13

OceanStor 18500 V3 and 18800 V3 Mission Critical Storage System V300R003

This document describes the implementation principles and application scenarios of the NAS feature. Also, it explains how to configure and manage NAS.
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Impact and Restrictions

Impact and Restrictions

This section describes the NFS feature in terms of supported protocol versions, network requirements, dependency on other features, and impact on system performance.

Supported Protocol Versions

The storage system supports NFSv3 and NFSv4.

Item

Document

RFC1813

NFS Version 3 Protocol Specification

RFC3530

NFS Version 4 Protocol

NOTE:
  • A storage system is added to a NIS domain and an LDAP domain and an NFS share is added to the network groups of the two domains. When the NIS domain fails, mounting the NFS share using clients in the LDAP domain may time out.
  • If an NIS domain fails after a storage system is added to the NIS domain and a client in a non-NIS domain fails to mount an NFS share using NFS v4 for the first time, enable the client to mount the NFS share again.

Network Requirements

The NFS feature supports the IPv4 and IPv6 network access protocols.

Interaction with Other Features

Table 2-2 describes the relationship between the NFS feature and other features.
Table 2-2  Relationship between the NFS feature and other features

Feature

Relationship

File system snapshot

Before accessing a file system snapshot, clients must create an NFS share for it.

CIFS/FTP/HTTP

  • To prevent file data overwriting or loss and ensure shared data consistency, a file in a file system cannot be written concurrently in multi-protocol sharing mode. Configure read-write sharing based on one protocol and read-only sharing based on the other protocols.
    NOTICE:

    A file in a file system that written concurrently in multi-protocol sharing mode will cause data loss, exercise caution when using it.

  • If NFS and CIFS shares are used together and the same file system is operated, restrictions exist in user convergence, lock convergence, permission convergence, and link convergence. Evaluate the scenario based on actual conditions.

System Impact

File systems can be shared in NFS, CIFS, FTP and HTTP modes at the same time. When clients concurrently access a file system using different protocols, the overall performance slightly decreases.

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Updated: 2019-08-14

Document ID: EDOC1000084098

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