text: **Quorum disk**
  A disk that contains a reserved area that is used exclusively for system management. The 
  quorum disk is accessed when it is necessary to determine which half of the clustered system 
  continues to read and write data. Quorum disks can either be MDisks or drives. 
  
  **Quorum index**
  The quorum index is the pointer that indicates the order that is used to resolve a tie. Nodes 
  attempt to lock the first quorum disk (index 0), followed by the next disk (index 1), and then, 
  the last disk (index 2). The tie is broken by the node that locks them first. 
  
  **RACE engine**
  The RACE engine compresses data on volumes in real time with minimal effect on 
  performance. See “Compression” on page 773 or “Real-time Compression” on page 783. 
  
  **Raw capacity**
  See “Capacity” on page 771. 
  
  **Real capacity**
  Real capacity is the amount of storage that is allocated to a volume copy from a storage pool. 
  See also “Capacity” on page 771. 