Help Center/ Scalable File Service Turbo/ Service Overview/ Notes and Constraints
Updated on 2024-12-23 GMT+08:00
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Notes and Constraints

Naming

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.

Specifications

Table 2 Specifications

Item

Description

Max. size of a single file
  • Standard, Standard-Enhanced (discontinued), Performance, and Performance-Enhanced (discontinued): 16 TB
  • 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB, 500 MB/s/TiB, and 1,000 MB/s/TiB: 320 TB

Max. number of files or subdirectories in a file system
  • Standard, Standard-Enhanced (discontinued), Performance, and Performance-Enhanced (discontinued): 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.

  • 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB, 500 MB/s/TiB, and 1,000 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 (discontinued), Performance, and Performance-Enhanced (discontinued): 1,024 bytes
  • 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB, 500 MB/s/TiB, and 1,000 MB/s/TiB: 4,096 bytes

Max. soft link length

1,024 bytes

Max. hard link length

255 bytes

Max. number of file systems

32 by default. You can submit a service ticket to increase the quota.

Operations

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 (discontinued) and Performance-Enhanced (discontinued): 320 TB
  • 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB, 500 MB/s/TiB, and 1,000 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.

SFS Turbo file system creation from backups
  • Standard, Standard-Enhanced (discontinued), Performance, Performance-Enhanced (discontinued), 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB, 500 MB/s/TiB, and 1,000 MB/s/TiB: supported

File locking with Flock

Not supported

Cache acceleration
  • Standard, Standard-Enhanced (discontinued), Performance, and Performance-Enhanced (discontinued): not supported
  • 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB, 500 MB/s/TiB, and 1,000 MB/s/TiB: supported. (Only eventual consistency is supported. If you need to disable the function, submit a service ticket.)
    NOTE:

    When multiple clients access the same file system, access requests of a client may be routed to different backends. Eventual consistency means that if a request hits a backend's local cache, it will fail to obtain the modifications made by other clients. Cache is normally valid for 3 to 30 seconds.

Max. number of authorized VPCs that can be added for a file system

20

Mounting an SFS Turbo file system

Max. number of clients that a file system allows
  • Standard, Standard-Enhanced (discontinued), Performance, and Performance-Enhanced (discontinued): 500
  • 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB, 500 MB/s/TiB, and 1,000 MB/s/TiB: 3,000

Accessing an SFS Turbo file system

Access methods

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
  • Standard–Enhanced (discontinued), Standard, Performance–Enhanced (discontinued), and Performance: The 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,500 MB/s/TiB, and 1,000 MB/s/TiB: The expansion increment is 1.2 TB, and the new capacity must be an integer multiple of 1.2 TB and no more than 1 PB.

Backing up an SFS Turbo file system

File system backup
  • Standard, Standard-Enhanced (discontinued), Performance, Performance-Enhanced (discontinued), 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB, 500 MB/s/TiB, and 1,000 MB/s/TiB: supported

Billing mode

If you create an SFS Turbo file system from a backup, you can only choose pay-per-use billing.

Unmounting an SFS Turbo file system

Unmount prerequisites

Processes and read and write operations are stopped.

Deleting an SFS Turbo file system

Deletion prerequisites

Desired file system is unmounted.

Prerequisites of deleting a pay-per-use SFS Turbo file system

Status of the desired file system is Available or Unavailable.

Prerequisites of unsubscribing from a yearly/monthly SFS Turbo file system

Status of the desired file system is Available or Unavailable.

Adding a tag

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

Performance

Table 4 Performance

Item

Description

Max. bandwidth
  • Standard: 150 MB/s
  • Standard-Enhanced (discontinued): 1 GB/s
  • Performance: 350 MB/s
  • Performance-Enhanced (discontinued): 2 GB/s
  • 20 MB/s/TiB and 40 MB/s/TiB: 8 GB/s (You can submit a service ticket to get up to 20 GB/s of throughput.)
  • 125 MB/s/TiB and 250 MB/s/TiB: 20 GB/s (You can submit a service ticket to get up to 100 GB/s of throughput.)
  • 500 MB/s/TiB and 1,000 MB/s/TiB: 80 GB/s (You can submit a service ticket to get up to 200 GB/s of throughput.)
NOTE:

The read/write speed is affected by the number of clients that mount the file system. For details, see How Do I Make the Most Out of My SFS Turbo File System?

Max. IOPS
  • Standard: 5,000
  • Standard-Enhanced (discontinued): 15,000
  • Performance: 20,000
  • Performance-Enhanced (discontinued): 100,000
  • 20 MB/s/TiB and 40 MB/s/TiB: 250,000
  • 125 MB/s/TiB and 250 MB/s/TiB: 1 million
  • 500 MB/s/TiB and 1,000 MB/s/TiB: 4 million (You can submit a service ticket to get up to 10 million of IOPS.)

Min. latency
  • Standard, Standard-Enhanced (discontinued), Performance, Performance-Enhanced (discontinued), 20 MB/s/TiB, 40 MB/s/TiB, 125 MB/s/TiB, 250 MB/s/TiB, 500 MB/s/TiB, and 1,000 MB/s/TiB: 1–2 ms