text: Figure 6-34 Distributed RAID 6 (for simplification, not all packs are shown) 
  
  Figure 6-35 on page 217 shows a single drive failure in this DRAID6 environment. Physical 
  disk 3 failed and the RAID 6 algorithm is using the spare capacity for a single spare drive in 
  each pack for rebuild (which is marked in green). All disk drives are involved in the rebuild 
  process, which significantly reduces the rebuild time. 