Avamar: Sharepoint Backup Fails on CSV Due to VSS Writer Issue

Summary: Avamar SharePoint Volume Shadow Copy Service (VSS) backups complete with exceptions when the SharePoint farm uses a back‑end Microsoft SQL Server cluster hosted on Cluster Shared Volumes (CSV). The Avamar SharePoint plug‑in skips CSV volumes, which causes file access errors during the backup process. ...

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Symptoms

  • Microsoft SharePoint farm is configured.
  • Back‑end Microsoft SQL Server is deployed as a cluster.
  • SQL Server databases are hosted on CSV storage.
  • SharePoint backup jobs complete with warnings or exceptions.
  • The Avamar back‑end client reports avtar errors related to CSV volumes.

Relevant Log Snippet from Back‑End Client

2017-03-16 14:03:48 avtar Info <17973>: CSV service is installed on the system. Any CSV volume detected will be skipped from freeze volumes list
.
2017-03-16 14:03:48 avtar Info <7324>: Volume Type for "C:\ClusterStorage\Volume1\" is "NTFS", Supports Compression=1, Encryption=1, ACLS=1, DataStreams=1, Reparse=1, Sparse=1, Hardlinks=1
.
.
2017-03-16 14:03:48 avtar Error <5139>: File access share error "C:\ClusterStorage\Volume1\<path to mdf file on CSV volume>.mdf" (code 32: Der Prozess kann nicht auf die Datei zugreifen, da sie von einem anderen Prozess verwendet wird).
2017-03-16 14:03:48 avtar Error <5139>: File access share error




 

Cause

The Avamar SharePoint VSS plug‑in cannot freeze Cluster Shared Volumes by using the Microsoft SQL VSS Writer. As a result, open database files on CSV storage cannot be accessed during backup, which generates <5139> file access errors.


 

Resolution

The Avamar SharePoint plug‑in does not support backups of SharePoint data when the SQL Server back‑end uses Cluster Shared Volumes. This configuration is unsupported and not tested.

Affected Products

Avamar

Products

Avamar, Avamar Client, Avamar Plug-in for SharePoint
Article Properties
Article Number: 000054637
Article Type: Solution
Last Modified: 01 أبريل 2026
Version:  4
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