text: **Solid-state disk**
  A solid-state disk (SSD) or Flash Disk is a disk that is made from solid-state memory and 
  therefore has no moving parts. Most SSDs use NAND-based flash memory technology. It is 
  defined to the Storwize V7000 as a disk tier generic_ssd. 
  
  **Space efficient**
  See “Thin provisioning” on page 786. 
  
  **Spare**
  An extra storage component, such as a drive or tape, that is predesignated for use as a 
  replacement for a failed component. 
  
  **Spare goal**
  The optimal number of spares that are needed to protect the drives in the array from failures. 
  The system logs a warning event when the number of spares that protect the array drops 
  below this number. 
  
  **Space-efficient volume**
  For more information about a space-efficient volume, see “Thin-provisioned volume” on 
  page 786. 
  
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              [html]<thead><tr><td>Stand - alone relationship</td></tr></thead><tbody><tr><td>In FlashCopy, Metro Mirror, and Global Mirror, relationships that do not belong to a consistency group and that have a null consistency - group attribute.</td></tr></tbody>
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  **785** Appendix C. Terminology 