HP 3PAR StoreServ Concepts Guide: HP 3PAR OS 3.1.3

1 Overview
HP 3PAR Storage Concepts and Terminology
HP 3PAR storage systems include the hardware components that physically store your data and
the software applications that manage your data. For more information about hardware platforms,
see “HP 3PAR Storage System Hardware” (page 64). For more information about system software
applications and features, see “HP 3PAR Software” (page 10).
The HP 3PAR storage system is composed of the following logical data layers:
• “Physical Disks” (page 8)
• “Chunklets” (page 8)
• “LDs” (page 8)
• “Common Provisioning Groups” (page 8)
• “Virtual Volumes” (page 8)
The relationship between HP 3PAR storage system data layers is illustrated in Figure 1 (page 7).
Each layer is created from elements of the layer above. Chunklets are drawn from physical disks,
logical disks (LDs) are created from groups of chunklets, CPGs are groups of LDs, and virtual
volumes use storage space provided by CPGs. The virtual volumes are exported to hosts and are
the only data layer visible to hosts.
Figure 1 HP 3PAR Storage System Data Layers
HP 3PAR Storage Concepts and Terminology 7