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Notes and Constraints

SFS Turbo Constraints

Table 1 Naming

Item

Description

SFS Turbo file system name

A file system name can contain only letters, digits, underscores (_), and hyphens (-). It must start with a letter and can contain 4 to 64 characters.

Tag key

A tag key can contain a maximum of 128 characters and can contain letters, digits, spaces, and special characters (_.:=+-@), but cannot start or end with a space or start with _sys_.

Tag value

A tag value can contain a maximum of 255 characters and can contain letters, digits, spaces, and special characters (_.:/=+-@), but cannot start or end with a space.
Table 2 Specifications

Item

Description

Max. size of a single file
  • Standard, Standard-Enhanced, Performance, and Performance-Enhanced: 16 TB
  • 250 MB/s/TiB, 125 MB/s/TiB, 40 MB/s/TiB, and 20 MB/s/TiB: 320 TB

Max. number of files or subdirectories in a file system
  • Standard, Standard-Enhanced, Performance, and Performance-Enhanced: 1 billion
    NOTE:

    The number of files or subdirectories allowed in a single file system is calculated by dividing the total capacity (KB) by 16. If the calculated value is greater than 1 billion, the 1 billion cap is used.

  • 250 MB/s/TiB, 125 MB/s/TiB, 40 MB/s/TiB, and 20 MB/s/TiB: 2 billion
    NOTE:

    The number of files or subdirectories allowed in a single file system is calculated by multiplying the total capacity (GB) with 25,000. If the calculated value is greater than 2 billion, the 2 billion cap is used.

Max. number of files or subdirectories in a single directory

20 million

NOTE:

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 queue for a long time as the NFS protocol needs to send a large number of requests to traverse files in the directory.

Max. directory depth

100

Max. path length
  • Standard, Standard-Enhanced, Performance, and Performance-Enhanced: 1,024 bytes
  • 250 MB/s/TiB, 125 MB/s/TiB, 40 MB/s/TiB, and 20 MB/s/TiB: 4,096 bytes

Max. soft link length

1,024 bytes

Max. hard link length

255 bytes
Table 3 Operations

Operation

Item

Description

Creating an SFS Turbo file system

Supported protocols

NFSv3 only

Max. capacity of a file system
  • Standard and Performance: 32 TB
  • Standard-Enhanced and Performance-Enhanced: 320 TB
  • 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB: 1 PB

Max. number of SFS Turbo file systems allowed

An account can create a maximum of 20 file systems in a region.

File locking with Flock

Not supported

Mounting an SFS Turbo file system

Max. number of clients that a file system allows
  • Standard, Standard-Enhanced, Performance, and Performance-Enhanced: 500
  • 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, and 250 MB/s/TiB: 3,000

Accessing an SFS Turbo file system

Access method

VPN, Direct Connect, and Cloud Connect

Expanding and reducing the capacity of an SFS Turbo file system

Capacity expansion

Supported

Capacity reduction

Not supported

New capacity value range
  • For a Standard, Standard-Enhanced, Performance, or Performance-Enhanced file system, the minimum expansion increment is 100 GB. A Standard or Performance file system can be expanded to up to 32 TB, and a Standard-Enhanced or Performance-Enhanced file system can be expanded to up to 320 TB.
  • 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB: The expansion increment is 1.2 TB, and the increment must be an integer multiple of 1.2 TB. The new capacity can be no more than 1 PB.

Unmounting an SFS Turbo file system

Unmount prerequisites

Processes and read and write operations are stopped.

Deleting an SFS Turbo file system

Deletion prerequisites

The desired file system is unmounted.

Deletion prerequisites for pay-per-use SFS Turbo file systems

The status of the desired file system is Available or Creation failed.

Adding tags

File system tagging

Supported

Number of tags

You can add a maximum of 20 tags to an SFS Turbo file system.

Tag key
  • When you add a tag, the tag key is mandatory and cannot be left blank.
  • Tag keys of an SFS Turbo file system must be unique.

Tag editing after file system creation

Supported
Table 4 Performance

Item

Description

Max. bandwidth
  • Standard: 150 MB/s
  • Standard-Enhanced: 1 GB/s
  • Performance: 350 MB/s
  • Performance-Enhanced: 2 GB/s
  • 20 MB/s/TiB and 40 MB/s/TiB: 8 GB/s
  • 125 MB/s/TiB and 250 MB/s/TiB: 20 GB/s

Max. IOPS
  • Standard: 5,000
  • Standard-Enhanced: 15,000
  • Performance: 20,000
  • Performance-Enhanced: 100,000
  • 20 MB/s/TiB and 40 MB/s/TiB: 250,000
  • 125 MB/s/TiB and 250 MB/s/TiB: 1 million

Min. latency

1–2 ms
Parent topic: Introduction