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Home > Success Center > Failover Engine (FoE) > File System Out of Sync / Synchronization Not Completing

File System Out of Sync / Synchronization Not Completing

Updated March 11th, 2016


Orion Failover Engine (FoE) uses the Volume Shadow Copy Service (VSS) to replicate files. When the files are in use or locked by a program on the passive server, the VSS agent cannot write to those files, thus the synchronization cannot complete.

EnvironmentEdit section

  • FoE all versions


Some antivirus software blocks VSS functionality on FoE.


  1. Check the Data tab for issues. This tab displays the files that are failing to synchronize.
  2. Check your antivirus and ensure exceptions exist for those file locations.
  3. Check the services running on the secondary server. If the protected application has services running, follow this procedure for all FoE protected services: FOE - Protected service bouncing or failover stalls on stopping a service
  4. Once all services are stopped, check your Application -> Replication tab again, and confirm that the files are being successfully synchronized.

Here are the directories to exclude from AV protection:

Files and directories to exclude from antivirus scanning

Also, SolarWinds recommends reviewing this article:

FoE interoperability with antivirus scanners



Last modified
17:04, 10 Feb 2017