Volume storage

The volume storage topics cover various aspects related to managing data storage.

• Count key data
  In count-key-data (CKD) disk data architecture, the data field stores the user data.
• Extent pools
  An extent pool is a logical construct that is used to manage a set of extents of the same type that are associated with a given rank group.
• Fixed block
  In fixed block (FB) architecture, the data (the logical volumes) are mapped over fixed-size blocks or sectors.
• Logical control unit
  A logical control unit represents a logical subsystem for zSeries hosts.
• Logical volumes
  A logical volume is the storage medium that is associated with a logical disk. It typically resides on one or more hard disk drives.
• Parallel access volumes
  Parallel access volumes (PAV) allow your system to access volumes in parallel when you use an S/390 or zSeries host.