Troubleshooting guide

7 — 5620 SAM system redundancy
7-4 Alcatel-Lucent 5620 Service Aware Manager
5620 SAM
System Administrator Guide
A main server role change is called a server activity switch. An automatic database
role change is called a failover; a manual database role change is called a switchover.
A typical redundant 5620 SAM deployment has a primary server and database in a
geographically separate facility from the standby server and database facility. To
ensure that the primary components are in the same LAN after an activity switch or
failover, you can configure automatic database realignment during a main server
installation or upgrade. See “Automatic database realignment” for more information.
The 5620 SAM GUI clients always communicate with the current primary server.
After a server activity switch, the GUI clients automatically connect to the new
primary server, which is the former standby server. The 5620 SAM OSS clients also
communicate with the current primary server, but after a server activity switch, the
OSS clients do not automatically connect to the new primary server.
The following general conditions apply to 5620 SAM system redundancy:
• The main servers and databases must each be redundant. For example, you cannot
have redundant servers and a standalone database.
• The network that contains a redundant 5620 SAM system must meet the latency
and bandwidth requirements described in the 5620 SAM Planning Guide.
• The server and database stations require the same OS version and patch level.
• The server stations require identical disk layouts and partitioning.
• The database stations require identical disk layouts and partitioning.
• The following users can perform manual server activity switches or database
switchovers:
• the samadmin user on a main server station
• a client GUI user with update or execute permissions on the following classes:
db.DatabaseManager.switchover
db.DatabaseManager.reinstantiateStandby
• a GUI client user with the admin scope of command role
Auxiliary server redundancy
5620 SAM auxiliary servers are optional servers that extend the network
management processing engine by distributing server functions, for example,
statistics collection, among multiple stations in a 5620 SAM domain. Each auxiliary
server is installed on a separate station in a 5620 SAM server cluster. An auxiliary
server communicates only with the primary main server and database. Main and
auxiliary servers open sessions only on the primary database.
A 5620 SAM main server controls task scheduling and sends task requests to
auxiliary servers. When a Preferred auxiliary server is unresponsive, the main server
directs the requests to a Reserved auxiliary server. If a Preferred auxiliary server
returns to service after a failure, the main server reverts to using the Preferred
auxiliary server and stops using the Reserved auxiliary server. The Preferred or
Reserved role of an auxiliary server is specified during a main server installation.
Note — To provide hardware fault tolerance in addition to software
redundancy, Alcatel-Lucent recommends using redundant physical
links between the primary and standby servers and databases to
ensure there is no single point of network or hardware failure.
Release 12.0 R6 | November 2014 | 3HE 08861 AAAF TQZZA Edition 01