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Notes and Constraints

Updated on 2024-11-25 GMT+08:00

SFS Capacity-Oriented

Table 1 SFS Capacity-Oriented restrictions

Item

Description

Access method

SFS Capacity-Oriented file systems can only be accessed over the intranet and used on the cloud.

Supported protocols

  • 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).
  • 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.
  • CIFS file systems cannot be mounted to Linux servers.
  • A file system can use either the NFS or CIFS protocol. It cannot use both protocols.
  • SMB file systems provide permission control only on the file systems, but not on files or directories.

Max. number of clients per file system

10,000

Max. capacity per file system

4 PB

Max. size of a single file

240 TB

Multi-VPC access

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.

Max. enterprise projects supported

20. If there are more than 20 enterprise projects, SFS Capacity-Oriented file systems may fail to be created. SFS Turbo is recommended.

Replication

Not supported

Cross-region mounting

Not supported

Cross-account mounting

Not supported

NOTE:

SFS Capacity-Oriented file systems are now sold out. You can use General Purpose File System or SFS Turbo.

General Purpose File System

Table 2 General purpose file system restrictions

Item

Description

Access method

Can only be accessed over the intranet.

Supported protocols

Only NFSv3 is supported (NFSv4 is not supported).

Max. number of clients per file system

10,000

File system encryption

Not supported

Number of files or subdirectories in a file system

Unlimited

Max. number of files or subdirectories in a single directory

1 billion

File system name

Must be globally unique. It cannot be the same as the name of any existing general purpose file system, including one created by the current user or any other user. And it cannot be changed after the file system is created.

File system deletion

If a general purpose file system is deleted, you can only create a general purpose file system with the same name as the deleted one 30 minutes after that file system has been deleted.

Client OS

  • Cannot be mounted to 32-bit Linux servers.
  • Cannot be mounted to Windows servers.

Changing root directory permissions

Not supported

Restrictions in the CCE and CCI scenarios

  • When General Purpose File System is used as the storage backend of CCE or CCI, you need to empty the in-use file systems before you can delete any PVCs or PVs. If you directly delete the PVCs or PVs, the file systems may fail to be deleted. Check whether the file systems are deleted on the General Purpose File System console.
  • Deleting PVCs or PVs takes some time. The billing ends until the corresponding general purpose file systems are deleted.

Lifecycle management

A maximum of 20 lifecycle rules can be configured for a file system.

File locking with Flock

Not supported

Tag

  • A maximum of 20 tags can be added to a file system.
  • Tag keys of a file system must be unique.

SFS Turbo

Table 3 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 or subdirectories per file system

1 billion

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 take a long time to complete as the NFS protocol sends a large number of requests to traverse directory files and requests are queueing up.

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 submit a service ticket to increase the quota.

File system backup

Supported

Backup data restoring to the original file system

Not supported

NOTE:

SFS Turbo uses single-AZ deployment. SFS Turbo file systems will fail if their AZ fails.

File locking with Flock

Not supported

Cross-region mounting via domain name

Not supported

NOTE:
  • When you mount a file system using its domain name, cross-region mounting is not supported. To mount a file system across regions, mount the file system using IP address.
  • The file system domain name randomly resolves to a corresponding domain name server IP address, so some domain name servers may have lots of mounts while others have only a few. It is recommended that you use the domain name servers to the maximum extent as uneven mounts may affect the file system performance.

Cache acceleration

Not supported

Tag

  • You can add a maximum of 10 tags to a file system.
  • Tag keys of a file system must be unique.

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