Apple Mac OS X Server (Administrator’s Guide) Bedienungsanleitung Seite 568

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m If status messages are interrupted on only one network, the secondary server sends email
notification of a network anomaly, but does not acquire the primary server’s IP address.
Email notification is sent when the secondary server detects a failover condition, a network
anomaly, and when the IP address is relinquished back to the primary server.
Normal operation and failover operation are illustrated in the following two diagrams.
Crossover Cable
en1
e
n
1
en0en0
100.0.0.11
100.0.0.10
10.0.0.1
10.0.0.2
Primary server
(Web server)
Secondary server
(mirrors primary
content, but not
running Web
server software)
Normal Operation
Network
Hub
Failover Operation
en0
en1
e
n
1
en0
100.0.0.10 and 100.0.0.11)
100.0.0.10
10.0.0.1 10.0.0.2
Primary server
(Web server)
Secondary server
(acquires primary
IP address and
starts Web
server software)
Network
Hub
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