Tenant Cloud Storage Cloud File Storage Product Introduction

System Limits

Last Updated At: 2025-10-21 09:10:00

Limit Description

Limits

  • File system protocols supported by CFS: NFS v3.0/v4.0, CIFS, SMB 2.0, SMB 2.5, and SMB 3.0.
  • Maximum capacity of a single standard file system: 160 TiB.
  • A single standard file system allows no more than 1,000 compute nodes to be mounted.

Related Instructions

UID and GID Descriptions

  • When NFS v3.0 is used: If the local account does not contain a UID or GID to which the file belongs, the UID and GID are displayed. If the local Linux account contains a UID or GID to which the file belongs, the corresponding username and group name are displayed according to the mapping relationship between the UID and GID in the local account.
  • When NFS v4.0 is used: If the Linux kernel version is later than 3.0, the UID and GID rules are the same as those in NFS v3.0. If the local kernel version is earlier than 3.0, the UIDs and GIDs of all files are displayed as nobody.

Support for CIFS or SMB Protocols

  • Support for protocol versions: CIFS and SMB 1.0 or later are supported. However, it is not recommended to use SMB 1.0 for mounting. Compared with SMB 2.0 or later, SMB 1.0 has serious vulnerabilities in performance and functionality due to significant differences in protocol design. In addition, Windows products that support SMB 1.0 or earlier have thoroughly exited Microsoft's supported lifecycle.
  • Users are not allowed to access the same file system using NFS and SMB, or directly access the SMB file system through the WAN.
  • It only provides read and write permission control at the file system level, but it will not provide ACL permission control at the file or directory level.
  • IOCTL/FSCTL operations such as sparse files, file compression, NIC status query, and reparse point are not supported.
  • Alternate data streams are not supported.
  • Protocol features of SMB 3.0 or later, such as SMB Direct, SMB Multichannel, SMB Directory Leasing, and Persistent File Handle, are not supported.

Note:

When using NFS v4.0 to mount the file system under Linux kernel versions earlier than 3.0, it is not recommended to perform a change owner or change group operation on a file or directory. Otherwise, the UID and GID of the file or directory will change to nobody.