Tools for special tasks OBSERVE support
Product Manual U7613-J-Z815-6-76
© Siemens Nixdorf Informationssysteme AG 1995 Pfad: D:\O7613e6\u7613e.k07
7.5.1 Constraints on high availability
The following conditions must be fulfilled in order to ensure the concept outlined here of
high availability for systems:
– Both servers must be operated in one domain.
– If a system fails, a “reconnect” is necessary for the PCs connected (a nd possibly also
a restart).
– The additional network interface available in each system does not supply data from the
network under normal operating conditions.
– The switching of disk areas and the uniqueness of resource names is guaranteed.
– The administrator must be able to export all access permissions.
– In order to switch disk areas to the system that is now operational again, the alternative
PCs must log off and then connect again after a successful switchover.
– Resources cannot be set up for a system while it is down.
– If the Primary Domain Controller (PDC) in a domain has failed, it will not be poss ible to
modify users and groups for the duration of the down time.
– Access permissions for the failed system can only be updated to the status of the last
“ACL backup”.
– Only one of the servers is to provide “Print” shares.
– Configuration changes (e.g. additional shares) in emergency mode no longer exist once
normal operation is resumed.
– If the WINS service is configured on one of the systems, it is not pos sible for the
remaining system to take over the WINS service in t he case of a failure.
However, you can provide high avaliability of the WINS service - independently of
OBSERVE - by configuring both systems as WINS servers and let these replicate with
each other.