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# Start draining external disks

External storage can be attached to a storage system.

## Prerequisites

The storage resource pool (SRP) containing the external disk that you want to drain must have sufficient free space to absorb the allocated tracks from the external disk that is being drained.

You can drain a disk only if it is not currently draining or already drained.

## Steps

To start a drain operation on an external disk:

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. Select the external disk that you want to drain, click , and click Start Draining.
7. 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.