text: Figure 6-29 A drive can be marked as Unused, Candidate, or Spare 
  
  To change the drive role with the CLI, use**chdrive**. See Example 6-13. It shows the drive that 
  was set offline with a previous command is set to spare. Notice that it can’t go from*Failed*to 
  *Spare*use in one step. It needs to be assigned to a*Candidate*role before. 
  
  Example 6-13 Changing drive role with CLI 
  
  IBM_Storwize:ITSOV7K:superuser>lsdrive -filtervalue status=offline 
  id status error_sequence_number use tech_type capacity mdisk_id 
  3 offline failed tier_enterprise 558.4GB 
  IBM_Storwize:ITSOV7K:superuser>chdrive -use spare 3 
  CMMVC6537E The command cannot be initiated because the drive that you have 
  specified has a Use property that is not supported for the task. 
  IBM_Storwize:ITSOV7K:superuser>chdrive -use candidate 3 
  IBM_Storwize:ITSOV7K:superuser>chdrive -use spare 3 
  IBM_Storwize:ITSOV7K:superuser> 