Tuesday, May 10, 2011

SQL Server VSS Writer - A nonrecoverable I/O error occurred on file Error 995

Sounds like two different issues one related to memory pressure and the other one is Hotfix for SQLServerWriter for 2005.

I have not applied these updates since I most likely will use SP3 instructions in KB913648.

SQLVDI Error log

SQLVDI: Loc=CVDS::Cleanup. Desc=Release(ClientAliveMutex). ErrorCode=(288)Attempt to release mutex not owned by caller.
. Process=220. Thread=7092. Client. Instance=. VD=.

A new Volume Shadow Copy Service update is now available that fixes various Volume Shadow Copy Service problems in Windows Server 2003


FIX: Error messages and an event may be logged when you use the Virtual Device Interface in SQL Server 2005 or in SQL Server 2000



The VSS I/O error log stated from Netbackup which I was not using but calls the same SQLServerWriter VSS as the software I was using. Leaving larger amount memory free on that SQL Server seemed to fix that issue.

Event SQL Server VSS log

BackupVirtualDeviceFile::SendFileInfoBegin:  failure on backup device . Operating system error 995(The I/O operation has been aborted because of either a thread exit or an application request.).

The SQL Server database backup exits with a Status 6 in Activity Monitor when using the NetBackup SQL Server extension and a status 995 is reported in the SQL Server errorlog.


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