Two types of clusters are possible in an SE server configuration.
Management Cluster
If two SE servers are combined into one management entity, 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.
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.
SU Cluster
Two Server Units of the same type (SU /390 or SU x86) can be combined into a logical unit, a so-called "SU Cluster".
An SU Cluster is configured by Customer Support based on the customer's wishes and provides the Live Migration (LM) function for the BS2000 systems of the two Server Units.
An SU Cluster with SU /390 is always cross-server and thus requires a Management Cluster. An SU Cluster with SU x86 may also be configured locally on one server, in case an SE server has more than one SU x86.
For further information on cluster types and the Live Migration function, see the "Operation and Administration" manual [2]. For further information on using clusters, see the "Cluster Solutions for SE Servers" whitepaper [7].