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# View external disks

External storage can be attached to a storage system.

## Steps

1. Select the storage system.
2. Select STORAGE > Storage Resource Pools.
3. Select the SRP and click to view its details.
4. Click the number next to Disk Groups.
5. Select an external disk group and click to view its details.
6. Click the number next to Number of disks.
   The following properties are displayed:

   Name | World Wide Name of the external disk.
   Spindle | Spindle ID of the external spindle.
   Vendor | Vendor name of the external disk.
   Capacity (GB) | Capacity in GB of the external disk.
   Array ID | ID of the storage system.
   Service State | Availability of the external disk. 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.
   Disk State | The state of the disk. Valid values are Active, Drained, Draining, and Disabled.
   Drained | Drain information about the disk if it is in Drained or Draining state. Otherwise it displays "-".

   The following controls are available:
   - Add eDisks— Add external disks
   - Remove— Remove external disks or external LUNs
   - Start Draining— Start draining external disks
   - Stop Draining— Stop draining external disks
   - Activate— Activate external disks