If two SE servers are combined into one Management Unit, it is called a "Management Cluster" (or "SE Cluster").
A Management Cluster is configured by Customer Support based on the customer's wishes and is used to operate und administrate the two SE servers together.
A Net Unit connection between the two SE servers (ISL-E) and one or two external configuration disks for managing the global data are required to establish a Management Cluster.
See also section "External configuration disks".
Figure 6: Management Cluster with two SE servers
Regarding administration and operation, all MUs of the Management Cluster are equally ranking. This means you can centrally administer and operate all objects of the whole SE server configuration (in this case: two SE servers) from one MU.
The SE servers can be operated as long as one MU functions. However, an MU of the local SE server is required for the SVP operation of an SU /390 and its correct HW display.