System components

Universal Volume Manager consists of several components, including the following:

• Virtual Storage Platform G200, G400, G600, G800 storage system, referred to as the local storage system

• One or more external storage systems

The local storage system can connect to many different storage systems, included ones manufactured by Hitachi, IBM®, and EMC. Hosts recognize the volumes in these systems as internal volumes of the local storage system.

• External volumes

A volume in an external storage system that is mapped to the local storage system is referred to as a mapped external volume. After an external volume is mapped, it is used as an internal volume, which is a virtual representation of the external volume.

• Internal volumes

A volume managed by the local storage system. An internal volume can be a physical volume or the virtual representation of an external volume.

• Logical devices (LDEVs)

• External path

• Mapping path

The following figure provides an overview of these components: