Clustered File Server unresponsive in a hung state following large number of FSA Placeholder recalls.

  • Modified Date:
  • Article ID:000086354


An issue has been reported where upon retrieval of a large number of archived items while recalling placeholders, the cluster node on which the file server is online becomes unresponsive due to a deadlock.


Investigation around the cause of the deadlock has led to a functional change within the methods used by the FSA mini filter driver. 

If CSC (Client Side Caching) is running on the client, then the server sees the file I/O requests. On the file server, a PAGED-read operation is initiated because of the Cache Manager’s read ahead mechanism. In due course, the Cache Manager acquires the lock on PagingIoResource in shared mode. A PreRead callback is being hit in the FSA Driver because of the PAGED-read operation.

In PreRead or PreWrite callbacks, the file is recalled and converted back to a normal file. In the process of converting the file back to normal, the reparse point is removed [done by calling FltUntagFile()] and the actual file is replaced.

The call to FltUntagFile is synchronous, which attempts to acquire the same lock, and results in a deadlock.



The FSA driver is being modified so that a deadlock no longer occurs in this situation.

This issue has been addressed as part of the following release:

Enterprise Vault 10.0.3 - Release Details

Enterprise Vault 9.0.5 - Release Details


Applies To

Enterprise Vault (EV) File System Archiving (FSA) installed on Microsoft Windows 2008 R2 Failover Cluster

Terms of use for this information are found in Legal Notices.



Did this article answer your question or resolve your issue?


Did this article save you the trouble of contacting technical support?


How can we make this article more helpful?

Email Address (Optional)