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.
Some antivirus software blocks VSS functionality on FoE.
- Check the Data tab for issues. This tab displays the files that are failing to synchronize.
- Check your antivirus and ensure exceptions exist for those file locations.
- 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
- 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