Two types of clusters are possible in an SE server configuration.
Management Cluster
If two or more 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 all SE servers of the SE Cluster together.
A Net Unit connection between the SE servers involved (ISL-E) and one or two external CRD 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 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.
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].