In case the issue is caused by the VM migration process, you can do the following:
• Increase the
UnknownFilesGB parameter value specified for the
Veeam VMware: Datastore Unknown Files Analysis monitor. For more information, see the Veeam MP for VMware Operations Guide, section
Overriding Performance Analysis Monitors.
• Increase the
NumSamples parameter value specified for the
Veeam VMware: Datastore Unknown Files Analysis monitor. For more information, see the Veeam MP for VMware Operations Guide, section
Overriding Performance Analysis Monitors.
• Decrease the
DatastoreScanInterval parameter value specified for the Collector that gathers data on datatstores involved in the VM migration process. For more information, see the Veeam MP for VMware Operations Guide, section
Collector Settings.
By default, Collectors query vCenter Servers every 3 hours.
When the VM migration process is over, the
Veeam VMware: Datastore Unknown Files Analysis monitor may still trigger alerts in the following cases:
• The Collector has not run a new query yet, or another VM migration process has already started by the time the Collector ran the new query.
• vSphere API reports outdated datastore capacity, free space and VM size values.
Collectors gather data via vSphere API and calculate the
UnknownFilesGB metric value using the following formula: unknownFilesGB = [total datastore space usage] – [free space] – [space used by known VM datastore files], in GB.
If none of the cases described in this article apply, you can run the
Scan Datastore for Unknown Files task to get the list of unknown files detected on the affected datastore. For more information on the task, see the Veeam MP for VMware Operations Guide, section
Scan Datastore for Unknown Files Task.
However, keep in mind that the
Scan Datastore for Unknown Files task increases the load on the vCenter Server and may take a long time to complete. That is why Veeam recommends that you run this task only for those datastores reported by the
Veeam VMware: Datastore Unknown Files Analysis monitor.
NOTE: As a workaround, you can disable the
Veeam VMware: Datastore Unknown Files Analysis monitor for specific datastores. The
Veeam VMware: Datastore Free Space Analysis monitor will continue running and reporting on free space left on these datastores.