Management Unit and SE Manager Architecture and strategies
52 U41855-J-Z125-3-76
2.6.3 Redundant Management Units
Central operation and administration of the SE server is continued after an MU has failed if
there is MU redundancy, i.e. if the SE server has a second MU.
Redundancy of the SKP functionality
On an SE server with SU /390, two MUs mean that the SKP functionality is also provided
with redundancy. As a result, when one MU fails the SU /390 can still be operated via the
SVP.
With respect to the SKP functionality, one MU is always "active" and the other is "passive".
Only the active MU can access the SVP of the SU /390. SVP accesses of the passive MU
take place by means of automatic redirection via the active MU.
On the BS2000 operation mode tab of the SU /390 you see the current status of the MUs with
respect to the SKP functionality. There you can also switch over the passive MU, i.e. the
two MUs change status (see Systems → [<se server>(SE<model>) →] <unit> (SU</390>),
“Switching active Management Unit” on page 109).
The SE Manager displays the current status of the SVP network and of the MU connections
in the IP configuration of the SU /390 (see Hardware → Units[ → <se server> (SE<model>)]
→ <unit> (SU</390>) → Management, “Managing the IP configuration” on page 208).
Operating redundant MUs
When two MUs are available, in other words MU redundancy exists, you can log into the
SE Manager on either of the two MUs. Operation and administration of the SE server is
possible without restriction on either of the two MUs.
In the title bar, the SE Manager displays the existing MUs and permits a "change" to the SE
Manager of the other MU via a link. You do not need to log in again, because, in the default
case, a session on the SE Manager is global. For this, the following requirements must be
met:
– The MUs are registered at an external DNS domain.
– The connection to the SE Manager was made via the DNS name of the MU (entering
the DNS name of the MU as address in the browser).
The MU on whose SE Manager the user is currently logged in is the local MU in this
session, and the other MU is the redundant MU.
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