text: **7.8.5 Adding a volume copy**
  
  You can add a copy to a volume. If volume copies are defined on different MDisks, the volume 
  remains accessible, even when the MDisk on which one of its copies depends becomes 
  unavailable. You can also create a copy of a volume on a dedicated MDisk by creating an 
  image mode copy of the volume. Although volume copies can increase the availability of data, 
  they are not separate objects. 
  
  Volume mirroring can be also used as an alternative method of migrating volumes between 
  storage pools. 
  
  To create a copy of a volume, use the**addvdiskcopy**command. This command creates a copy 
  of the chosen volume in the specified storage pool, which changes a non-mirrored volume 
  into a mirrored one. 