text: When the system is running in this manner, the number of ISL links becomes more 
  important. As with the storage-to-System ISL oversubscription, this load also requires a 
  maximum of 7-to-1 oversubscription. Exercise caution and careful planning when you 
  determine the number of ISLs to implement. If you need assistance, contact your IBM 
  representative. 
  
  (cid:2) ISL trunking/port channeling 
  
  For the best performance and availability, use ISL trunking or port channeling. 
  Independent ISL links can easily become overloaded and turn into performance 
  bottlenecks. Bonded or trunked ISLs automatically share load and provide better 
  redundancy in a failure. 