You can group, or pool, media servers.
To create a media server pool
On the central administration server's navigation bar, click Media Servers.
On the task pane, under Media Server Pool Tasks, click New media server pool.
Enter a media server pool name and description.
Select the media servers you want to add to the pool.
Click OK.
More Information
Grouping managed media servers in pools in CASO
Adding managed media servers to a media server pool in CASO
Removing a managed media server from a media server pool in CASO
Renaming a media server pool in CASO
Deleting a media server pool in CASO