If two or more SE servers are combined into one management entity, this is called a "Management Cluster" (or "SE Cluster").
A Management Cluster is configured by Customer Support based on the customer's requirements and is used to operate und administrate the involved SE servers together.
A Net Unit connection between the 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 CRD 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 each 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.
Figure 6 shows a Management Cluster with two SE /390 and additional SU x86 in each SE server. A Management Cluster can also be formed with two SE x86.