Help Center/ Scalable File Service/ User Guide/ Introduction/ Notes and Constraints
Updated on 2025-06-27 GMT+08:00
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Notes and Constraints

General

  • To obtain better performance, you are advised to use the operating systems listed in Supported Operating Systems, which have passed the compatibility test.
  • Currently, SFS does not support replication.
  • Currently, SFS does not support cross-region access.

SFS Turbo

  • Only the NFSv3 protocol is supported (NFSv4 is not supported).
  • A maximum of 500 compute nodes can be mounted to and access a single file system at the same time.
  • The maximum capacity of a single file system is 32 TB, and the maximum size of a single file allowed is 320 TB.
  • Maximum number of files supported by a single file system = Capacity/16. For example, the maximum number of files supported by a 500 GB file system is 32,768,000 (500 GB/16 KB = 500 x 1024 x 1024/16).
  • By default, a single directory can contain a maximum of 20 million files.

    If you need to execute the ls, du, cp, chmod, or chown command on a directory, you are advised to place no more than 500,000 files or subdirectories in that directory. Otherwise, requests may take long times as the NFS protocol sends a large number of requests to traverse directory files and requests are queuing up.

  • The maximum full path is 4,096 bytes, and the maximum file name length is 255 bytes.
  • The maximum soft link length is 1,024 bytes.
  • The maximum number of hard links is 255.
  • The maximum directory depth is 100 layers.
Parent topic: Introduction