Notes and Constraints

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.
CIFS file systems cannot be mounted to Linux .
Currently, SFS does not support replication.
Currently, SFS does not support cross-region access.
SFS Capacity-Oriented is not suitable for file storage scenarios requiring low latency and high IOPS, such as database services, website building, and code storage.

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.
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.

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 1 PB, 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.
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 long times as the NFS protocol sends a large number of requests to traverse directory files and requests are queueing 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

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