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OceanStor 18500 V3 and 18800 V3 Mission Critical Storage System V300R003 Basic Storage Service Guide for File 16

"This document describes the basic storage services and explains how to configure and managebasic storage services."
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Planning File System Sharing

Planning File System Sharing

The OceanStor 18500 V3/18800 V3 storage system supports file system sharing in a variety of environments. To facilitate the use of file systems, plan file system sharing based on site requirements.

File systems can be shared using four protocols: NFS, CIFS, FTP, and HTTP. In Homedir share mode, a file system is shared to a specific user as an exclusive directory. The user can only access the exclusive directory named after its user name.
  1. NFS-based sharing
    This sharing mode applies mainly to the file system sharing in Linux or UNIX. NFS works based on client/server architecture. A server provides other computers with file system access, and clients access the shared file systems. NFS enables clients running a variety of operating systems to share files over a network. It has the following highlights:
    • Powerful concurrent processing capability. Multiple clients can use the same file so that all the users on the network can access the same data.
    • Solid data integrity. All users can read the same group of files.
    • Ease of use. File system mounting and remote file system access are transparent to users.
  2. CIFS-based sharing
    This sharing mode is mainly applied by Windows hosts to access files or other resources over the Internet or an intranet. CIFS allows Windows clients to identify and access shared storage system resources. With CIFS, clients can quickly read, write, and generate files in storage systems as on local PCs. CIFS helps maintain a high access speed and a short system response when even a large number of users concurrently access the same shared file. CIFS has the following highlights:
    • Powerful concurrent processing capability. The file sharing and file lock mechanisms offered by CIFS prevent client conflicts when multiple clients read or update the same file. However, only one client can update the file at a time.
    • High performance. Access requests sent by a client for a shared file are cached locally first instead of being directly delivered to the storage system. When the client sends a request for the shared file again, the file is read from cache to improve access performance.
    • Solid data integrity. CIFS provides cache preemption, prefetch, and writeback to ensure data integrity. Access requests sent by a client for a shared file are cached locally first instead of being directly delivered to the storage system. If other clients want to access the shared file, the cached data is written to the storage system. Only one file copy is activated each time to prevent data conflicts.
    • Robust security. CIFS can be used to authenticate the access requests for a share. The authentication management controls users' access permissions, ensuring data confidentiality and security.
    • Wide application. Any CIFS-capable client can access a CIFS shared space.
    • Unified coding standard. CIFS supports various types of character sets, applicable to different language systems.
  3. FTP-based sharing
    This sharing mode applies mainly to file transfer between computers. FTP uses client/server architecture. A client can send requests to a server for uploading, downloading, generating, and changing a directory. FTP requires two connections between a client and a server:
    • Control connection. used to control data transfer. Generally, port 21 is used. In an environment with the firewall function, you need to enable port 21.
    • Data connection. used to transfer data between the client and server. Generally, port 20 is used. In an environment with the firewall function, you need to enable port 20.
    FTP has the following highlights:
    • Quick transfer. FTP is suitable for transferring large files. The larger the files, the quicker the file transfer is.
    • Ease of use. FTP masks computer system information and enables file transfer between different operating systems.
    The storage system also supports the FTPS (FTP-SSL) protocol (applicable to V300R003C20). FTPS, an extension to the commonly used FTP, adds support for the TLS and the SSL cryptographic protocols. SSL is a protocol that provides data encryption and decryption during secure data transmission between a client and an SSL-based server. The FTPS protocol has two transfer modes:
    • Explicit

      Control connection uses port 21 by default and data connection uses port 20 by default. In an environment with the firewall function, you need to enable port 20 and 21.

    • Implicit

      Control connection uses port 990 by default and data connection uses port 989 by default. In an environment with the firewall function, you need to enable port 989 and 990.

  4. HTTP-based sharing
    HTTP is applied mainly to transfer hypertext from web servers to local browsers. It improves working efficiency of browsers and reduces network transfer workload. With HTTP, computers can correctly and quickly transfer hypertext. In addition, HTTP determines which part of hypertext content to transfer and which part of transferred content to be firstly displayed. HTTP works based on client/server architecture. Servers provide hypertext content for other computers. A client sends an HTTP request to a specified port of a server using a browser to access the hypertext content.
    NOTE:

    If a client uses HTTPS protocol to access the server, the default port of the server is 443. In an environment with the firewall function, you need to enable port 443.

After learning the characteristics of different share protocols, users can select the appropriate protocol based on service requirements.
NOTE:
When sharing a file system, ensure that the file system is online.
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Updated: 2019-08-14

Document ID: EDOC1000084081

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