text: Strive to distribute volumes evenly across available I/O Groups and nodes within the clustered 
  system. Although volume characteristics depend on the storage pool from which it is created, 
  any volume can be assigned to any node. 
  
  When you create a volume, it is associated with one node of an I/O Group, the*preferred*
  *access node*. By default, when you create a volume, it is associated with the I/O Group node 
  by using a round-robin algorithm. However, you can manually specify the preferred access 
  node if needed. 
  
  No matter how many paths are defined between the host and the volume, all I/O traffic is 
  serviced by only one node (the preferred access node). 
  
  If you plan to use volume mirroring, put each copy in a different storage pool backed by 
  different back-end storage subsystems for maximum availability. However, depending on your 
  needs, it might be sufficient to use a different set of physical drives, a different storage 
  controller, or a different back-end storage for each volume copy. Strive to place all volume 
  copies in storage pools with similar performance characteristics. Otherwise, the volume 
  performance as perceived by the host might be limited by the performance of the slowest 
  storage pool. 