Article Number: 000031318
NetWorker: Troubleshooting Backup Failures Due to VSS Issues
Summary: Backups of a Windows client are failing due to VSS issues. There are several different reasons that could result in VSS failing to process a snapshot on the client operating system; e.g: Unstable VSS writer, or insufficient space to create a snapshot. VSS (Volume Shadow copy (Snapshot) Service) is a Windows operating system service. VSS is required for SYSTEM STATE or DISASTER RECOVERY: save sets or when completing BBB (Block Based Backups). VSS must be stable and working correctly on the host operating system before it can be used with NetWorker backups. ...
Article Content
Symptoms
Backups of a Windows client are failing due to Volume Shadow copy Service (VSS) issues. There are several different reasons that could result in VSS failing to process a snapshot on the client operating system; e.g: Unstable VSS writer, or insufficient space to create a snapshot. This KB details some troubleshooting actions which can be taken by a Windows System Administrator or NetWorker Backup Administrator; however, it is recommended to engage Microsoft support on any persistent VSS issue.
These issues are typically indicated in the backup logs which can be observed in the NMC.
These issues are typically indicated in the backup logs which can be observed in the NMC.
VSS OTHER: ERROR: VSS failed to process snapshot:
90108:save: Unable to save the SYSTEM STATE save sets: cannot create the snapshot.
7259:save: VSS reports adding volume [C:\] <file:///C:/]> to snapshot set failed for both hardware/software provider.VSS OTHER: ERROR: VSS failed to process snapshot: Unexpected VSS provider error.
VSS OTHER: ERROR: VSS failed to process snapshot: Insufficient storage available to create either the shadow copy storage file or other shadow copy data. (VSS error 0x8004231f)
90108:save: Unable to save the SYSTEM STATE save sets: cannot create the snapshot.
VSS-related events will also be visible in the Windows Event Viewer on the client.Cause
VSS is a Windows operating system function. VSS is required for SYSTEM STATE or DISASTER RECOVERY:\ save sets or when completing BBB (Block Based Backups). VSS must be stable and working correctly on the host operating system before it can be used with NetWorker backups.
Resolution
First rule out a potential capacity issue. Microsoft recommends leaving 10-15% of a drives total capacity available for completing VSS snapshots. If the capacity is above 90% VSS snapshots may fail.
To test whether or not VSS is working correctly on the client operating system, run the following commands from an administrative command prompt:
1. Check the VSS writers status: vssadmin list writers
Example:
2. If the writers are stable check for pre-existing snapshots, there should be none: vssadmin list shadows
Example:
3. If there are snapshots listed, delete them: vssadmin delete shadows /all
Example:
5. If you successfully created a snapshot, delete it using the command from step 3 and run a backup of this client. If the backup fails with a VSS issue, contact Dell NetWorker support for assistance. It is also recommended to engage Microsoft support in the event collaboration is needed between NetWorker support and Microsoft support.
To test whether or not VSS is working correctly on the client operating system, run the following commands from an administrative command prompt:
1. Check the VSS writers status: vssadmin list writers
Example:
c:\>vssadmin list writers
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2012 Microsoft Corp.
Writer name: 'System Writer'
Writer Id: {e8132975-6f93-4464-a53e-1050253ae220}
Writer Instance Id: {34a07e16-fcdb-4ab0-b603-d58c0f741c9a}
State: [1] Stable
Last error: No error
...
...
NOTE: The above output is an example of one of the writers; however, ALL writers should be Stable, No error.
2. If the writers are stable check for pre-existing snapshots, there should be none: vssadmin list shadows
Example:
c:\>vssadmin list shadows
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2012 Microsoft Corp.
No items found that satisfy the query.
3. If there are snapshots listed, delete them: vssadmin delete shadows /all
Example:
c:\>vssadmin delete shadows /all
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2012 Microsoft Corp.
Do you really want to delete 1 shadow copies (Y/N): [N]? y
Successfully deleted 1 shadow copies.
4. Once there are no snapshots and if the disk drive is below 90% capacity usage attempt to create a snapshot: vssadmin create shadow /for=DRIVE_LETTER:\
Example:
Example:
c:\>vssadmin create shadow /for=C:\
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2012 Microsoft Corp.
Successfully created shadow copy for 'C:\'
Shadow Copy ID: {1f6a1448-daad-4e68-a334-31dd40a64dd9}
Shadow Copy Volume Name: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy2
NOTE: You must do this for each critical volume required for SYSTEM STATE or DISASTER_RECOVERY:\ savesets.
5. If you successfully created a snapshot, delete it using the command from step 3 and run a backup of this client. If the backup fails with a VSS issue, contact Dell NetWorker support for assistance. It is also recommended to engage Microsoft support in the event collaboration is needed between NetWorker support and Microsoft support.
Additional Information
VSS Space Requirements: https://technet.microsoft.com/en-us/library/cc161409.aspx
VSS Information: https://msdn.microsoft.com/en-us/library/windows/desktop/aa384625(v=vs.85).aspx
VSS Information: https://msdn.microsoft.com/en-us/library/windows/desktop/aa384625(v=vs.85).aspx
Article Properties
Affected Product
NetWorker
Product
NetWorker
Last Published Date
29 Sep 2023
Version
3
Article Type
Solution