text: **6.1.2 Managed disks in a storage pool**
  
  A storage pool is created as an empty container, with no storage assigned to it. Storage is 
  then added in the form of**MDisks**. An MDisk can be either an array from internal storage (as 
  an array of drives) or an LU from an external storage system. The same storage pool can 
  include both internal and external MDisks. 
  
  Arrays are assigned to storage pools at creation time. You cannot have an array that does not 
  belong to any storage pool. They cannot be moved between storage pools. It is only possible 
  to destroy an array by removing it from a pool and to re-create it with a new pool. 
  
  External MDisks can exist outside the pool. You can assign them to storage pools and remove 
  them from storage pools. The MDisk object remains on a system, but its state (mode of 
  operations) might change. 