text: Image mode volumes cannot be reduced in size. To reduce their size they must first be 
  migrated to fully managed mode. 
  
  Before the**shrinkvdisksize**command is used on a mirrored volume, all copies of the volume 
  must be synchronized. 
  
  **Important:**Consider the following guidelines when you are shrinking a disk: 
  
  (cid:2) If the volume contains data or host-accessible metadata (for example an empty physical 
  volume of a logical volume manager), do not shrink the disk. 
  
  (cid:2) This command can shrink a FlashCopy target volume to the same capacity as the 
  source. 
  
  (cid:2) Before you shrink a volume, validate that the volume is not mapped to any host objects. 
  
  (cid:2) You can determine the exact capacity of the source or master volume by issuing the 
  **svcinfo lsvdisk -bytes vdiskname**command. 
  
  Shrink the volume by the required amount by issuing the**shrinkvdisksize -size disk_size**
  **-unit b | kb | mb | gb | tb | pb vdisk_name | vdisk_id**command. 