Troubleshooting guide

7 — 5620 SAM system redundancy
7-10 Alcatel-Lucent 5620 Service Aware Manager
5620 SAM
System Administrator Guide
The database with which a main server tries to align itself is called the preferred
database of the main server. An operator enables automatic database realignment and
specifies the preferred database during 5620 SAM server installation, or during
server configuration after installation.
When a primary server starts, it verifies that the primary database is the preferred
database. If the primary database is not the preferred database, the server performs a
database switchover to reverse the primary and standby database roles. If the
switchover is successful, the main servers and databases in the 5620 SAM system are
aligned. If the switchover fails, each database reverts to the former role, and the main
server generates an alarm about the failed switchover.
When you perform a database switchover and automatic database realignment is
enabled, the primary server does not attempt database realignment. A switchover is
a manual operation that is considered to be a purposeful act.
Performing a server activity switch when automatic database realignment is enabled
triggers a database switchover.
Redundancy function summary
Table 7-1 summarizes the 5620 SAM main server redundancy functions.
Table 7-1 5620 SAM server redundancy functions
Note — For automatic database alignment to work, you must enable
it and specify a preferred database on each main server in a redundant
5620 SAM system.
Function Notes
Automatic server activity switch
An automatic activity switch occurs when the primary server cannot communicate with
the standby server, and involves the following sequence of events.
• The standby server cannot communicate with the primary server within 60 seconds,
or the primary server cannot communicate with the managed network.
• The standby server performs an activity switch to become the new primary server. The
activity switch occurs only if the standby server can communicate with the managed
network.
• If automatic database realignment is enabled, the new primary server attempts a
database switchover.
• The new primary server connects to the primary database and manages the network.
• The new primary server and the auxiliary servers synchronize the outstanding request
information.
When the primary server
detects a standby server
communication failure, each
GUI client receives
notification of the failure.
During an activity switch,
each client GUI displays a
main server status message.
During an activity switch, a
main server does not process
SNMP traps from the
network, and no NE
resynchronizations occur.
The auxiliary servers
continue to process
outstanding requests, and
synchronize the request
information with the new
primary server after the
activity switch.
When the communication
failure is resolved, each GUI
client receives notification
that redundancy is restored.
Manual server activity switch
A manual activity switch is typically performed for maintenance or testing during a
scheduled period of low activity, and involves the following sequence of events.
• A 5620 SAM administrator initiates the activity switch on the primary server.
• The standby server performs an activity switch to become the new primary server.
• The new primary server connects to the primary database and manages the network.
• The new primary server and the auxiliary servers synchronize the request information.
• If automatic database realignment is enabled, the new primary server attempts a
database switchover.
Release 12.0 R6 | November 2014 | 3HE 08861 AAAF TQZZA Edition 01