External storage
An external storage system, or storage controller, is a device that coordinates and controls the operation of one or more disk drives. A storage system synchronizes the operation of the drives with the operation of the system as a whole.
The system can manage a combination of internal and external storage and represents all the detected storage as MDisks. The management GUI can be used to configure both internally and externally attached storage. Data that is stored on external storage can also be migrated to internal storage, simplifying data and storage management. The system does not require a license for its own control and expansion enclosures. However, a license is required for each enclosure of any external storage systems that are being virtualized. For example, if the system is made up of one control enclosure, one expansion enclosure, and one virtualized storage system that is itself made up of two enclosures, two licenses are required. The system can manage a combination of internal and external storage and represents all the detected storage as MDisks. For certain models of the system, only migration of data that is stored on external storage to internal storage is supported. Other models of the system support external storage virtualization through an required license. Each enclosure on any external storage systems that are being virtualized requires a license. For example, if the system is made up of one control enclosure, one expansion enclosure, and one virtualized storage system that is itself made up of two enclosures, two licenses are required.
If you have configured logical unit names (LUNs) on your external storage systems, it is not possible for the system to determine this name, because the namespace is local to the external storage system. However you can use the external storage system WWNNs and LUN IDs to identify each device. This unique ID can be used to associate MDisks on the system to the corresponding LUNs on the external storage system.
Select in the management GUI to view all MDisks detected by the system. The MDisks are organized by the external storage system that presents them. To display the unique ID that is associated with the external storage system, use the filter function in the management GUI to display the UID column. If new external storage is added to the system, select . If no MDisks display, ensure that you have cabled the system correctly to the external storage system.