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- Glossary
- User Guide
- Announcements
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Operation Overview
- Usage Limits
- Creating Cloud Disks
- Attaching Cloud Disks
- Initializing Cloud Disks
- Expanding Cloud Disks
- Overview
- Expanding Cloud Disks
- Extending System Disk Partitions and File Systems Online
- Extending Data Disk Partitions and File Systems (Windows)
- Extending Data Disk Partitions and File Systems (Linux)
- Detaching Cloud Disks
- Viewing Cloud Disk Information
- Terminating Cloud Disks
- Adjusting Cloud Disk Performance
- Cloud Disk Data Protection Configuration
- Cloud Disk Data Backup Point
- Managing Snapshots
- Monitoring and Alarms
- Practical Tutorial
- Troubleshooting
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Snapshot APIs
- ApplySnapshot
- DeleteSnapshots
- DescribeSnapshots
- CreateSnapshot
- ModifySnapshotAttribute
- UnbindAutoSnapshotPolicy
- DescribeDiskAssociatedAutoSnapshotPolicy
- DescribeAutoSnapshotPolicies
- DeleteAutoSnapshotPolicies
- CreateAutoSnapshotPolicy
- BindAutoSnapshotPolicy
- ModifyAutoSnapshotPolicyAttribute
- ModifySnapshotsSharePermission
- DescribeSnapshotSharePermission
- GetSnapOverview
- CopySnapshotCrossRegions
- Cloud Disk APIs
- AttachDisks
- CreateDiskBackup
- ModifyDiskAttributes
- ResizeDisk
- DescribeInstancesDiskNum
- CreateDisks
- InquiryPriceCreateDisks
- DescribeDisks
- DetachDisks
- DescribeDiskConfigQuota
- InquiryPriceResizeDisk
- TerminateDisks
- ModifyDiskExtraPerformance
- InquirePriceModifyDiskExtraPerformance
- InitializeDisks
- ModifyDiskBackupQuota
- InquirePriceModifyDiskBackupQuota
- DescribeDiskBackups
- DeleteDiskBackups
- ApplyDiskBackup
- Data Types
- Error Codes
- FAQs
- Cross-region Replication
- CBS Service Level Agreement
- Contact Us
- Glossary
Failed to Unmount Cloud Disks from Windows CVM Instances
Last updated: 2023-12-22 10:57:04
Symptom
After a disk is set to offline status for a Windows CVM instance, detaching the cloud disk in the console failed.
Possible Causes
Processes of the operating system, such as Taskmgr.exe, svchost.exe, and System, are using the disk, causing the detaching to fail.
Solutions
1. Check whether the disk is in offline status.
2. View the processes that use the disk in the Event Viewer. End them and try to detach the disk again.
Troubleshooting
Note:
This document uses a CVM instance with Windows Server 2012 R2 DataCenter 64-bit English installed as an example. Note that the steps may vary by operating system version.
Checking the disk status
1. Log in to the Windows CVM instance as the admin as instructed in Logging in Using Standard Method (Recommended).
2. On the desktop, right-click 
3. In the pop-up menu, select Disk Management.
4. In the Disk Management window, check whether the cloud disk to be detached is in offline status.
If so, proceed to the next step.
If not, right-click the status area of the disk and click Offline in the pop-up menu.
Locating and ending processes
1. On the desktop, right-click 
2. In the pop-up menu, select Event Viewer.
3. In the Event Viewer window, select Windows Logs > System on the left.
4. In the system logs, click to view the alarm information and determine that the process using the disk is Taskmgr.exe.
5. End the process and try to detach the cloud disk in the console again.
If you cannot manually end the process (system processes such as svchost.exe or System), shut down the CVM instance as instructed in Shutting Down Instances and then try to detach the cloud disk in the console again.
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