text: **Data reduction pool**
  Data Reduction pools are specific types of pools where more control over volumes capacity is 
  given to specific hosts (for example VMware VAAI/VASA/VVOL, Microsoft ODX). These hosts 
  are able to return unused space for reuse. With standard pools, the system is not aware of 
  any unused space on host-allocated volumes. See also “Data reduction”. 
  
  **Data reduction savings**
  See “Capacity” on page 771. 
  
  **Dependent write operation**
  A write operation that must be applied in the correct order to maintain cross-volume 
  consistency. 
  
  **Directed maintenance procedure**
  The fix procedures, which are also known as directed maintenance procedures (DMPs), 
  ensure that you fix any outstanding errors in the error log. To fix errors, from the Monitoring 
  window, click**Events**. The Next Recommended Action is displayed at the top of the Events 
  window. Select**Run This Fix Procedure**and follow the instructions. 
  
  **Discovery**
  The automatic detection of a network topology change, for example, new and deleted nodes 
  or links. 