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Limitations and Constraints

Updated on 2024-03-21 GMT+08:00

General

  • SFS Capacity-Oriented supports the NFSv3 and CIFS protocols. Export options with NFSv3 include rw, no_root_squash, no_all_squash, and sync. Export options with CIFS include rw and sync.
  • Encrypted CIFS file systems do not support copychunk.
  • You can mount file systems to all ECSs that support the NFSv3 protocol. To obtain better performance, you are advised to use the operating systems listed in Supported Operating Systems, which have passed the compatibility test.
  • To obtain better performance, you are advised to use the operating systems listed in Supported Operating Systems, which have passed the compatibility test.
  • CIFS file systems cannot be mounted to Linux servers.
  • Currently, SFS does not support replication.
  • Currently, SFS does not support cross-region access.

SFS Capacity-Oriented

  • Only NFSv3 is supported (NFSv4 is not supported), and CIFS is supported (SMB 2.0, 2.1, and 3.0 are supported, but SMB 1.0 is not supported).
  • A file system can use either the NFS or CIFS protocol. It cannot use both protocols.
  • A maximum of 10,000 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 4 PB, and that of a single file is 240 TB.
  • Multi-VPC access is supported. You can add a maximum of 20 VPCs for one file system and create a maximum of 400 ACL rules for all added VPCs.

SFS Turbo

Table 1 SFS Turbo restrictions

Item

General

Access method

VPN, Direct Connect, and Cloud Connect

Max. bandwidth

2 GB/s

Max. IOPS

100,000

Min. latency

1 to 2 ms

Max. capacity per file system

320 TB

Supported protocol

NFSv3

Max. number of clients per file system

500

Max. number of authorized VPCs per file system

20

Max. size of a single file

16 TB

Max. number of files per file system

1 billion

Max. number of files in a single directory

10 million

Max. directory depth (unit: layer)

100

Max. path length (unit: byte)

1,024

Max. soft link length (unit: byte)

1,024

Max. hard link length (unit: byte)

255

Max. number of file systems

32 by default. You can apply for a higher quota.

File system backup

Supported

File locking with Flock

Not supported

Cache acceleration

Not supported

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