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The following error found the in the NTA.BusinessLayer.log indicates that the disk hosting the storage path for the NTA Flow Storage Database has run out of space.
Symptoms include loss of all charting data since the space ran out, despite "Last Received Netflow" date/time in "Manage Sources" appearing to be current. Upon close inspection of the Flow Storage Database contents, you will find that the actual flow data is not being retained but there is oftentimes enough space for solely the timestamp portion to be saved, which updates the "Last Received Netflow" time but does not actually save any historical data.
All Orion NTA 4.x environments
NTA.BusinessLayer.log shows the following error:
ERROR SolarWinds.Netflow.Processing.Workflow.NetFlowPacketWorkflowManager - Error flushing data System.ServiceModel.FaultException: Exception 'Exception' while appending data to Fastbit: Not enough free space on the disk. Free space: ### Minimum: ,### minimum requested free space: ###.
at Solarwinds.Netflow.Fastbit.Server.Api.NTAFastBitServerService.AppendData(String tableName, String columnNames, Array  data, Int32 offset, Int32 length, Boolean lowPriority)
at Solarwinds.Netflow.Fastbit.Client.FastBitBulkCopy.AppendData(String tableName, string  columnNames, Array data, Int32 offset, Int32 length, Boolean lowPriority)
at Solarwinds.Netflow.Processing.Fastbit.DAL.FlowsDAL.InsertFlowsInternal(Nullable`1 nodId, IEnumerable`1 data, Boolean lowPriority)
at Solarwinds.Netflow.Processing.Workflow.CachedDataStorage.ProcessCachedData(cachedDetailsData data)
at Solarwinds.Netflow.Processing.Workflow.NetflowPacketWorkflowManager.Flush_Data(CachedDetailsData data, EventWaitHandle eventFlushcompled)
Please note that this is different than the following error, which indicates the the primary file group on the SQL server is out of space.
ERROR SolarWinds.Netflow.Processing.Workflow.NetFlowPacketWorkflowManager - Error flushing data System.ServiceModel.FaultException: Exception 'SqlException' while resolving string IDs