text: If you analyze the statistics and find that the system does not appear to be sending enough 
  IOPS to your external SSD MDisk, you can always increase the load parameter. 
  
  **Easy Tier operating modes**
  Easy Tier includes the following main operating modes: 
  
  (cid:2) Off 
  
  When off, no statistics are recorded and no cross-tier extent migration occurs. Also, with 
  Easy Tier turned off, no storage pool balancing across MDisks in the same tier is 
  performed, even in single tier pools 
  
  (cid:2) Evaluation or measurement only 
  
  When in this mode, Easy Tier only collects usage statistics for each extent in a storage 
  pool, if it is enabled on both the volume and the pool. No extents are moved. This 
  collection is typically done for a single-tier pool that contains only HDDs so that the 
  benefits of adding Flash drives to the pool can be evaluated before any major hardware 
  acquisition. 
  
  (cid:2) Automatic data placement/Storage pool balancing 
  
  In this mode, usage statistics are collected and extents. Extent migration is performed 
  between tiers (if there is more than one pool in a tier). Also, auto-balance between MDisks 
  of each tier is performed. 
  
  **Note:**The auto-balance process automatically balances existing data when MDisks are 
  added into a pool. However, it does not migrate extents from existing MDisks to achieve 
  even extent distribution among all old and new MDisks in the storage pool. The Easy 
  Tier migration plan is based on performance. It is*not*based on the capacity of the 
  underlying MDisks or on the number of extents on them. 