Backup Failure due to Unstable Guest VM Writers (Microsoft Error Code: 0x80042301)
KB ID: 104061
Description:
This Knowledge Base article addresses the alert that occurs when backup operations fail due to guest VM writers being in an unstable state. The alert is associated with Microsoft error code 0x80042301. It provides solutions to resolve this issue and ensure successful backups.
Cause:
Backup failures are triggered by an alert when the VSS (Volume Shadow Copy Service) writers of the agent's guest VM are in a failed or invalid state. This prevents the backup process from proceeding successfully.
Solution:
To resolve the issue of backup failures caused by unstable guest VM writers, follow the solutions provided below:
Solution 1: Restart VSS Writer
1. Open the command prompt on the affected VM.
2. Execute the command: `vssadmin list writers`
3. Check the status of the VSS writers. If any writers are not in a stable state, proceed to the next step.
4. Restart the corresponding writers that are showing as failed:
- Execute the command: `net stop <Service Name>
- Execute the command: `net start <Writer Service Name
5. Confirm the status change of the writers to Stable by executing: `vssadmin list writers`
6. After ensuring the writers are in a stable state, rerun the backup operation.
Solution 2: Update Windows OS in Guest VM
1. Update the Windows operating system within the guest VM to the latest patch.
2. After completing the update, attempt to schedule the backup job again.
These solutions aim to address the instability of VSS writers in guest VMs that lead to backup failures. By following the steps outlined, users can troubleshoot and rectify the issue, ensuring successful backup operations.