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# View external storage

External storage can be attached to a storage system.

## About this task

The External Storage page allows you to view and manage external storage as well as validate paths and zoning. The first time that you go to the External Storage page, Unisphere for PoweMax scans all volumes that are visible from the DX directors.

At least four paths to external volumes are required, meaning that at least four ports belonging to a single DX dual initiator pair must be configured. The best practice for maximum redundancy is achieved by using single initiator or multiple target zoning. Individual zones can be created that contain each DX port and all external ports that the external volumes are available on.

To view external storage and validate paths and zoning:

## Steps

1. Select the storage system.
2. Select Storage > External Storage.

   Use the tree view lists to filter the list of external LUNs by selecting various combinations of members within a tree list view (control ports, external ports, and external LUNs). You can select a single item, multiple items in consecutive rows, or multiple items in nonconsecutive rows. As each selection is made, the filtered results table is updated to reflect the current combination of filter criteria.

   Control Ports tree view list

   The following properties display:

   - Director—Storage system DX director
   - Port—Port number on the director

   External Ports tree view list

   The following properties display:

   - Port WWN—World Wide Name of the external port
   - Array ID—External storage system ID
   - Dir:Port—Director: Port ID
   - Vendor—External storage system vendor

   External LUNs tree view list

   The following properties display:

   - LUN WWN—World Wide Name of the external LUN
   - Capacity (GB)—Capacity in GB of the external LUN

   Filtered LUNs table

   The following properties display:

   - External LUN WWN—World Wide Name of the external LUN
   - Vendor—Vendor name of the external LUN
   - Capacity (GB)—Capacity in GB of the external LUN
   - Volume—Volume ID on the external storage system
   - LUN—Displays 0 for storage systems
   - Virtualizing Status—The mode of operation that the eDisk uses. Possible values are External, Encapsulated, and None.
   - Emulation—Emulation type of the external LUN
   - Disk Group—Disk group that contains the virtualized LUN
   - Spindle—Spindle ID of the external spindle
   - Service State—Availability of the external LUN - possible values are Normal, Degraded, and Failed. Failed means that there are no network paths available to the external LUN. Degraded means that there are paths from only one of the supporting DX directors. Normal means that there are network paths available from both supporting DX directors.

   The following control is available:

   - Remove— Remove external LUNs