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FusionCloud Solution Description 04

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What Is Scalable File Service?

What Is Scalable File Service?


Scalable File Service (SFS) provides completely hosted sharable file storage for Elastic Cloud Servers (ECSs). Compatible with the Network File System protocol, SFS is expandable to petabytes, features high performance, and seamlessly handles data-intensive and bandwidth-intensive applications.

Differences between EVS, OBS, and SFS

Table 10-1 shows the differences between EVS, OBS, and SFS.

Table 10-1 Differences between EVS, OBS, and SFS



Application Scenario


Elastic Volume Service (EVS)

Scalable virtual block storage based on a distributed architecture.

EVS disks provide high data reliability and I/O throughput, and are easy to use. They apply to file systems, databases, and other system software or applications that use block storage devices.

  • In a similar way for traditional disks on servers, you can format EVS disks that are attached to ECSs, and create file systems on them.
  • A shared EVS disk can be attached to multiple servers to share data.
  • Data can only be accessed on the internal network of data centers.

Object Storage Service (OBS)

Object-based storage service. It provides you with massive, highly reliable, and secure data storage capabilities at low cost.

OBS combines the advantages of EVS and SFS. That is to say, it features high-speed direct access to disks and distributed sharing. It is a cloud-based storage service which stores unstructured data, such as documents, images, and videos.

  • You have to use programming or third-party tools to access OBS.
  • Data sharing: Servers, embedded devices, and IOT devices use the same path to access shared data.
  • Data can be accessed on the Internet.

Scalable File Service (SFS)

On-demand high-performance file storage, which can be shared by multiple ECSs on the cloud.

SFS applies to video cloud scenarios, and seamlessly handles data-intensive and bandwidth-intensive applications.

  • Complying with the standard file protocol, SFS mounts the file service to the server. In this way, you gain the same experience as using local file directories.
  • Data sharing: A file system can be mounted to multiple servers. Data can be shared and accessed.
  • Data can only be accessed in the internal network of data centers.

Limitations and Constraints

  • Currently, SFS supports the NFSv3 protocol only.
  • You can mount file systems to all ECSs that support the NFSv3 protocol. However, for optimal performance of the file system, you are advised to use an operating system that has passed the compatibility test.
  • Only VPCs in the same AZ and project can be added to a file system. A maximum of 20 VPCs can be added to a file system. The number of authorized IP addresses in the added VPCs cannot exceed 400.
Updated: 2019-10-23

Document ID: EDOC1100063247

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