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# Add external disks

External storage can be attached to a storage system.

## About this task

You can add an external disk to the external disk group of a storage resource pool (SRP).

When adding an external disk for storage systems running HYPERMAX OS 5977 or PowerMaxOS 5978, if there is no pre-existing external disk group, it is created automatically when the external disk is added to the selected SRP. If an external disk group exists for the external storage system’s external LUN WWN, the external LUN WWN is added to it.

## Steps

To add an external disk:

1. Select the storage system.
2. Select Storage > Storage Resource Pools.
3. Select the SRP.
4. Click Add EDisks.

   The Add eDisks dialog box shows the available external LUN WWNs from multiple external storage systems.

5. Select the external disk to be added.
6. If you want to preserve the existing data on the external LUN, select Incorporate eDisk data. If you leave the Incorporate eDisk data cleared, the existing data on the external LUN is cleared.
7. Optional: In the Add Storage Group list, select a storage group to add.
   You can filter the list by searching for a storage group by name.

   This option is available only on storage systems running HYPERMAX OS 5977 Q1 2016.

8. Do one of the following:
   - Click Run Now to perform the operation now.
   - Expand Run Now and click Add to Job List to add this task to the job list, from which you can schedule or run the task at your convenience. For more information, see Schedule jobs and Preview jobs.