SMB Protocol Issues

CFS

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      • Announcement on CFS Metric Adjustments
  • Product Description
    • Product Introduction
    • Basic concepts
    • Product features
    • Product specifications
    • Usage Limits and Recommendations
    • Selection Guide
      • How to Choose Between CFS and PFS
      • How to Choose Between CFS, BOS and CDS
    • Application scenarios
  • Product pricing
    • Pay-as-you-go
    • Storage package billing
    • Insufficient balance reminders and debt handling
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      • Create file system
      • Delete a file system
      • View file system details
      • Set File System Capacity Upper Limit
    • Mount and Access
      • Add mount target
      • Mount and Unmount CFS on BCC
        • Mount and Unmount on Linux System
          • Mount and Unmount SMB Protocol CFS on Single BCC
          • Batch mounting and unmounting NFS CFS on multiple BCC
          • Mounting and unmounting NFS CFS on a single BCC
        • Mount and Unmount SMB Protocol CFS on Windows System
        • Mount CFS File System When Purchasing New BCC
      • Using CFS in CCE
    • Permission Group Management
    • Identity and access management
    • Data encryption
    • Management Tags
    • Backup
    • Monitor and Alarm
      • View monitoring
      • Alarm management
      • Metric definition
    • Cloud Audit
  • Typical Practices
    • Set Different User Permissions for Different Directories
    • Using File Systems Across Regions Or Accounts
    • Use SFTP to Upload and Download CFS File System Data
    • Use Rsync to Sync From Old File System to CFS File System
    • Best Practices for Managing CFS with Terraform
    • Performance Testing Methods
      • Linux System Performance Testing Methods
      • Windows System Performance Testing Methods
  • API Reference
    • API Function Update Records
    • API Overview
    • Interface Overview
    • General Description
    • Service domain
    • Error code
    • File System Related Interfaces
      • Create file system
      • Update file system
      • Query file system
      • Query mount client
      • Drop file system
      • Update file system tags
    • mount target Related Interfaces
      • Create mount target
      • Query mount targets
      • Delete mount target
    • Permission Group-related APIs
      • Create Permission Group
      • Update permission group
      • Query Permission Groups
      • Delete permission group
      • Create permission group rules
      • Update permission group rules
      • Query permission group rules
      • Delete permission group rule
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    • SMB Protocol Issues
  • Service Level Agreement (SLA)
    • CFS Service Level Agreement (SLA)
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CFS

  • Updates and Announcements
    • Function Release Records
    • Product Announcement
      • Announcement on CFS Metric Adjustments
  • Product Description
    • Product Introduction
    • Basic concepts
    • Product features
    • Product specifications
    • Usage Limits and Recommendations
    • Selection Guide
      • How to Choose Between CFS and PFS
      • How to Choose Between CFS, BOS and CDS
    • Application scenarios
  • Product pricing
    • Pay-as-you-go
    • Storage package billing
    • Insufficient balance reminders and debt handling
    • Billing Cases
  • Quick Start
    • Getting Started Overview
    • Quick start (Linux)
    • Quick start (Windows)
  • Operation guide
    • Activate Service
    • Manage File System
      • Create file system
      • Delete a file system
      • View file system details
      • Set File System Capacity Upper Limit
    • Mount and Access
      • Add mount target
      • Mount and Unmount CFS on BCC
        • Mount and Unmount on Linux System
          • Mount and Unmount SMB Protocol CFS on Single BCC
          • Batch mounting and unmounting NFS CFS on multiple BCC
          • Mounting and unmounting NFS CFS on a single BCC
        • Mount and Unmount SMB Protocol CFS on Windows System
        • Mount CFS File System When Purchasing New BCC
      • Using CFS in CCE
    • Permission Group Management
    • Identity and access management
    • Data encryption
    • Management Tags
    • Backup
    • Monitor and Alarm
      • View monitoring
      • Alarm management
      • Metric definition
    • Cloud Audit
  • Typical Practices
    • Set Different User Permissions for Different Directories
    • Using File Systems Across Regions Or Accounts
    • Use SFTP to Upload and Download CFS File System Data
    • Use Rsync to Sync From Old File System to CFS File System
    • Best Practices for Managing CFS with Terraform
    • Performance Testing Methods
      • Linux System Performance Testing Methods
      • Windows System Performance Testing Methods
  • API Reference
    • API Function Update Records
    • API Overview
    • Interface Overview
    • General Description
    • Service domain
    • Error code
    • File System Related Interfaces
      • Create file system
      • Update file system
      • Query file system
      • Query mount client
      • Drop file system
      • Update file system tags
    • mount target Related Interfaces
      • Create mount target
      • Query mount targets
      • Delete mount target
    • Permission Group-related APIs
      • Create Permission Group
      • Update permission group
      • Query Permission Groups
      • Delete permission group
      • Create permission group rules
      • Update permission group rules
      • Query permission group rules
      • Delete permission group rule
    • Data type
  • Go-SDK
    • Overview
    • Initialization
    • File system
    • Mount target
    • Error handling
  • FAQs
    • Common Questions Overview
    • General Problems
    • Billing Problems
    • NFS protocol questions
    • SMB Protocol Issues
  • Service Level Agreement (SLA)
    • CFS Service Level Agreement (SLA)
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  • SMB Protocol Issues
Table of contents on this page
  • What SMB versions does CFS support?
  • Which operating system versions does SMB support respectively?
  • Which features are not supported by CFS SMB?
  • Why is the update of file properties lagging in some editors within Windows Explorer?

SMB Protocol Issues

Updated at：2025-11-11

What SMB versions does CFS support?

Currently, CFS supports the primary functionalities of SMB versions, including SMB 1, SMB 2, and SMB 3.

Which operating system versions does SMB support respectively?

Since SMB 1 has significant shortcomings regarding both security and performance, it is strongly advised that users adopt SMB 2 or later versions, such as the operating system clients starting from Windows Vista onward. For details on SMB protocol support for each Windows version, refer to the table below:

SMB version Years Corresponding OS version
SMB 3.1.1 2015 Windows 10 / Windows Server 2016
SMB 3.0.2 2013 Windows 8.1 / Windows Server 2012 R2
SMB 3.0 2012 Windows 8 / Windows Server 2012
SMB 2.1 2009 Windows 7 / Windows Server 2008 R2
SMB 2.0.2 2008 Windows Vista SP1 / Windows Server 2008
SMB 2.0 2007 Windows Vista

Which features are not supported by CFS SMB?

Currently, CFS SMB does not support the following features:

  • Cross-protocol access is not supported, meaning users cannot use both NFS and SMB to access the same file system.
  • File byte-range locking or client caching based on Oplocks and Lease is not supported.
  • File ACL management is not supported.
  • Asynchronous file I/O is not supported.
  • SMB 3 advanced features like multichannel, persistent file handles, SMB direct, and SMB directory leasing are not supported.
  • IOCTL/FSCTL operations, such as sparse files, file compression, network card status queries, and reparse points, are not supported.

Why is the update of file properties lagging in some editors within Windows Explorer?

Take Notepad as an example: If a user opens Notepad, edits content, and saves the file, they might notice the file size doesn't update right away. In such cases, right-clicking to view the “General” properties or refreshing Windows Explorer will display the updated size.

This issue arises from how certain editors in Windows (like Notepad) update the file properties displayed in Windows Explorer during edits. By this time, the file’s actual properties have already been updated; however, Windows Explorer has failed to refresh the display. Hence, this issue does not impact typical usage. For other editors like WordPad, this problem does not occur.

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