Interstage Shunsaku Data Manager Operator's Guide - Microsoft(R) Windows(R) 2000/ Microsoft(R) Windows Server(TM) 2003 - - UNIX -

1.3.7 High Availability (HA)

Systems that are required to provide a high level of reliability must be able to provide high availability (HA), which minimizes the interruption to services caused by a server failure.

If a problem occurs in an active searcher, Shunsaku will automatically transfer the data from the faulty searcher to another (functioning) searcher so that operations can continue without interruption. This capability is referred to as the automatic degradation function.

Failover operation can also be performed so that even if a server fails, another server can immediately take over its duties and ensure that there is no interruption to services. Director Server failover reduces system downtime, and Search Server failover maintains search performance levels.

Shunsaku provides the following HA functions:

• Director Server failover
• Search Server failover

[Figure : Configuration for Director Server Failover]

[Figure : Configuration for Search Server Failover]

Refer to 2.1.1 Process Configuration for more information on each Shunsaku process (conductor, director, sorter, searcher).

Refer to Chapter 8 HA Function for more information on the HA function.