You can provide high availability and failover support by adding servers to support
specific functions. For example, you might want to set up several search servers to spread the query
processing load across processors.
Before you begin
You must install Watson Explorer Content Analytics on
the server that you want to add to the system topology before you
specify the purpose of the server in the administration console.
You
must ensure that all software that is needed to support the intended
server role is installed. For example, if you add a search server
and want to use WebSphere® Application
Server to
support your applications, you must ensure that a supported version
of WebSphere Application
Server is installed.
If you add a high availability server or an index server, the new server and the master server
must share the same data directory (ES_NODE_ROOT). The high availability servers are supported
through IBM®
PowerHA® for AIX® and
Microsoft Cluster Service (MSCS) on Windows.
About this task
The types of servers that you can add depends on how you
install the core components:
- Single server
- In a single server installation, you have one master controller server. You can then add
additional search servers, document processing servers, and index servers. You can also add
servers that combine functions, such as a server that supports document processing and search
or a server that supports indexing and search. On AIX or
Windows platforms, you can also add one high
availability master server to support crawling, parsing, indexing, and search.
- Distributed servers
- In a distributed server installation, you have a master controller server, a master crawler
server, and at least one search server. You can then add additional search servers, document
processing servers, and index servers. You can also add servers that combine functions, such
as a server that supports document processing and search or a server that supports indexing
and search. On AIX or Windows platforms, you can also add one high availability server to
support crawling and one high availability server to support parsing and indexing.
Procedure
To add a server to the system and assign a role for how
the server is to be used:
- Verify that Watson Explorer Content Analytics and
all required software is installed on the server that you want to
add, and verify that the new server is running. To add
the server, the system must be able to connect to it.
- Click System to open the System view.
- Click Add Server.
- On the Add a Server page, type the fully qualified host name of the
server that you want to add. Also specify the common communication layer (CCL) port that was
specified when Watson Explorer Content Analytics was installed on the server.
- Select the server role and click OK. The server that you added is shown in the system topology
and becomes available for processing requests on this system.
What to do next
You can monitor the server status, start and stop the server,
or remove the server from the system topology. For a search server,
you can also view detailed statistics about query processing.
Restriction: After you add a server, you cannot change its host
name, port, or role. If you want to change the server configuration,
you must remove the server from the system topology and then add it
again.