text: **11.7.3 Changing the system parameters**
  
  When you want to change system parameters specific to any remote copy or Global Mirror 
  only, use the**chsystem**command. The**chsystem**command features the following parameters 
  for MM/GM: 
  
  (cid:2)**-relationshipbandwidthlimit*cluster_relationship_bandwidth_limit***
  
  This parameter controls the maximum rate at which any one remote copy relationship can 
  synchronize. The default value for the relationship bandwidth limit is 25 MBps (megabytes 
  per second), but this value can now be specified as 1 - 100,000 MBps. 
  
  The partnership overall limit is controlled at a partnership level by the**chpartnership**
  **-linkbandwidthmbits**command, and must be set on each involved system. 
  
  **Important:**Do not set this value higher than the default without first establishing that 
  the higher bandwidth can be sustained without affecting the host’s performance. The 
  limit must never be higher than the maximum that is supported by the infrastructure 
  connecting the remote sites, regardless of the compression rates that you might 
  achieve. 
  
  (cid:2)**-gmlinktolerance*link_tolerance***
  
  This parameter specifies the maximum period that the system tolerates delay before 
  stopping Global Mirror relationships. Specify values of 60 - 86,400 seconds in increments 
  of 10 seconds. The default value is 300. Do not change this value except under the 
  direction of IBM Support. 