Siemens Unix V4.0 Manual De Usuario

Tools for special tasks

Product Manual

U7613-J-Z815-6-76

©

 S

iem

e

n

s

 N

ix

dor

f 

In

fo

rm

at

io

n

s

s

y

s

te

m

e

 A

G

 1

9

9

5

 

P

fad

: D:

\O

7

613

e6

\u

761

3e

.k

07

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 (and 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 possible 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 possible for the 
remaining system to take over the WINS service in the 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.