Temporarily Missing Data
If your configuration includes an external HDS, you may notice that you are missing records from reports during the Logger recovery process.
If the Logger connected to the external HDS goes offline, the external HDS does not connect to a different Logger. For example, if the external HDS is connected to Logger A and Logger A fails, the HDS does not connect to Logger B. When Logger A comes back up, it recovers data from Logger B and begins to receive current historical information. After Logger A has recovered all of the data from Logger B, it replicates this data to the external HDS.
If reports are run from the external HDS for recent intervals while Logger A is offline or while the Logger is in the process of recovering or replicating data, you might not see data for those intervals in reports. These records are missing only temporarily; you will see the data after the replication process for the tables used by the reports is complete.
If your deployment does not include an external HDS and Logger A goes offline, you will not see report data from the interval during which Logger A was offline until Logger A has recovered that data from Logger B.