Resolving Auxiliary Copy Fallen Behind Alert Issues

If the auxiliary copy fallen behind alert is configured, then an alert is generated when the system predicts that the auxiliary copy operation will exceed the number of hours specified for the operation to complete. Use the following table to verify and resolve the auxiliary copy fallen behind alert issues.

Cause for the Fallen Behind Alert	Resolution
The query and insertion (Q&I) time of the deduplication database (DDB) is high	To improve the DDB performance, upgrade the DDB volume with faster solid state drive (SSD) disks. For more information, see Performance of Query and Insertion (QI) of the DDB is Slow.
The total throughput is low	To improve the bandwidth utilization, see Improving Bandwidth Utilization with DASH Copy or Backups with Deduplication
Insufficient bandwidth configured on the destination	If the bandwidth configured on the destination is low, you can choose from either of the following options: Increase the network bandwidth between the source and the destination. Reduce the amount of data to be copied. Amount of data can be managed by : Managing the retention rules configured on the storage policy copies. For more information, see Data Aging - Getting Started. Using selective copy of certain full backups. For example, you could select copies with monthly full backups instead of all the backups. For more information, see Creating a Selective Copy. Copying and retaining important data by associating selective subclients to the storage policy copy. For more information, see Assigning CommCell Entities to a Storage Policy Copy.
Destination tape library is not optimally utilized	If you have a tape library configured as the destination, verify the following: There are enough tapes available for the data. There are sufficient tape drives to match the data streams. However, if the streams are waiting for drives, you can utilize streams and tape resources more effectively by enabling Combine Source Data Streams to and Multiplex source streams options on a secondary copy. For more information see Combining Streams Using Data Multiplexing.
Destination tape library is not scalable	If tape management is slowing down the copying process, you might want to configure the cloud storage as the destination for secondary copy. For more information on configuring cloud library, see Creating a Cloud Storage Library.
The auxiliary copy operation is not configured to run optimally	Tune the configurations to run the auxiliary copy operation by modifying the settings as described in Performance Tuning for the Auxiliary Copy Operation.
Data is not equally distributed across all streams on the source copy	Enable stream randomization to distribute data evenly among the streams. For more information, see Configuring Dynamic Stream Allocation.