text: **Note:**If insufficient extents are available within your target storage pool, you receive an 
  error message. Ensure that the source MDisk group and target MDisk group have the 
  same extent size. 
  
  You can use the optional threads parameter to control priority of the migration process. The 
  default is 4, which is the highest priority setting. However, if you want the process to take a 
  lower priority over other types of I/O, you can specify 3, 2, or 1. 
  
  You can run the**lsmigrate**command at any time to see the status of the migration process, 
  as shown in Example 7-30. 