Removing a managed media server deletes it from a media server pool, but does not remove it from the All Managed Media Servers node.
To remove a managed media server from a media server pool
On the central administration server's navigation bar, click Media Servers.
Select a media server pool from which you want to remove a managed media server.
On the right pane, select the managed media server that you want to remove.
On the task pane, under Media Server Pool Tasks, click Remove Media Server.
The managed media server no longer appears in the media server pool.
More Information
Adding managed media servers to a media server pool in CASO