CMUR00020W This operation takes a long time to complete. If you
proceed, you must click the Refresh button on the Status tab in
order to see the latest data. Click Continue to take the resource
offline. Click Cancel to cancel the operation.
Explanation

You have selected a resource to take offline, but you are being warned that you are

about to initiate a long running task. To view progress, you must manually click the
Refresh button on the Status tab of the page, which shows the most current
information.
Action
Click Continue to take the resource offline. Click Cancel to cancel the operation.
Chapter 6. DS Storage Manager service messages 143