text: **RAID 6**
  RAID 6 is a RAID level that has two logical parity drives per stripe, which are calculated with 
  different algorithms. Therefore, this level can continue to process read and write requests to 
  all of the array’s virtual disks in the presence of two concurrent disk failures. 
  
  **Read intensive drives**
  The read intensive flash drives that are available on IBM Storwize V7000 Gen2, IBM Storwize 
  V5000 Gen2, and IBM SAN Volume Controller 2145-DH8, SV1, and 24F enclosures are one 
  Drive Write Per Day (DWPD) Read Intensive drives. 
  
  **Rebuild area**
  Reserved capacity that is distributed across all drives in a redundant array of drives. If a drive 
  in the array fails, the lost array data is systematically restored into the reserved capacity, 
  returning redundancy to the array. The duration of the restoration process is minimized 
  because all drive members simultaneously participate in restoring the data. See also 
  “Distributed RAID or DRAID” on page 775. 
  
  **Reclaimable (or reclaimed) capacity**
  Reclaimable Data is the capacity that is no longer needed. Reclaimable capacity is created 
  when data is overwritten and the new data is stored in a new location, when data is marked as 
  unneeded by a host using the SCSI unmap command, or when a volume is deleted. 