What do I do if an exception occurs on the system disk of a Windows ECS instance? -

This topic describes how to troubleshoot system disk exceptions on a Windows Elastic Compute Service (ECS) instance.

Background information

System disk exceptions may affect patch updates and driver installations on a Windows ECS instance and even the next startup of the Windows ECS instance.

Problem description

Open the Command Prompt window on the Windows ECS instance and run the chkdsk or sfc /VERIFYONLY command to check the status of the disks attached to the Windows ECS instance.

If exceptions occur on a disk, error messages appear in the check result.

Solution

Perform the following steps to troubleshoot system disk exceptions:

Connect to the Windows ECS instance.
For more information, see Connection method overview.
Open the Command Prompt window as an administrator.
Run the following command to check the integrity of the system:
```
sfc /scannow
```
If the command output does not indicate integrity issues, the system passes the integrity check.
Run the following command to check whether the system disk runs as expected:
```
chkdsk c:
```
If the command output does not indicate issues, the system disk runs as expected.
Restart the Windows ECS instance in the ECS console.
For more information, see Restart an instance.

If the system disk exceptions are not fixed, use a snapshot of the system disk to restore the system disk. For more information, see Roll back a disk by using a snapshot.