text: To set the background copy bandwidth optimally, ensure that you consider all three resources: 
  Primary storage, intercluster link bandwidth, and auxiliary storage. Provision the most 
  restrictive of these three resources between the background copy bandwidth and the peak 
  foreground I/O workload. 
  
  Perform this provisioning by calculation or by determining experimentally how much 
  background copy can be allowed before the foreground I/O latency becomes unacceptable. 
  Then, reduce the background copy to accommodate peaks in workload. 