The following figure describes the points for which the number of concurrent connections, number of concurrent executions, and connection pool size can be set in a system on which the EADs session failover functionality is used:

Figure 7-3 Points for which the number of concurrent connections, number of concurrent executions, and connection pool size can be set

Table 7-7 Number of concurrent connections, number of concurrent executions, and connection pool size contents to be set in setting points

Setting point	Setting location	Setting target	Setting contents
(1)	Web server	Number of maximum concurrent connections	Maximum number of concurrent connections to a Web server.
(2)	Redirector	Connection pool size	Pool size of the connection that is used to communicate with a J2EE server.
(3)	Web container	Threads	Maximum number of threads that concurrently process requests on a J2EE server.
(4)	EADs client	Connection pool size	Pool size of the connection that is used to communicate with the EADs server.
(5)	EADs server	Number of maximum concurrent connections	Maximum number of concurrent connections to the EADs server.
(6)		Number of maximum concurrent executions	Maximum number of threads that concurrently process requests on the EADs server.
(7)		Connection pool size	Pool size of the connection that is used to communicate with other EADs servers in the EADs cluster.

The following table describes the settings for the number of concurrent connections, number of concurrent executions, and connection pool size recommended in the case of Figure 7-3:

Table 7-8 Recommended settings of number of concurrent connections, number of concurrent executions, and connection pool size

Setting point	Recommended settings of number of concurrent connections, number of concurrent executions, and connection pool size	Impact if you do not set the recommended settings of number of concurrent connections, number of concurrent executions and, connection pool size
(1) - (3)	--	--
(4)	The same value as (3)	If you specify a value that is smaller than the recommended value, pooled connections become insufficient because the J2EE server threads are exceeded. As a result, connections might get established and broken whenever there is a request.
(5)	(1) Number of Web servers 1.2	If you specify a value that is smaller than the recommended value, connections with the EADs server fail because the maximum number of concurrent connections to the EADs server are exceeded. As a result, global session operations on the EADs server might fail.
(6)	The same value as (5)	--
(7)	(6) (Multiplicity of EADs data - 1)#	If you specify a value that is smaller than the recommended value, pooled connections become insufficient because of access concentration from EADs clients and other EADs servers. As a result, connections might get established and broken whenever there is a request.

Legend:

--: No recommended value for the EADs session failover.

#

If the value of Multiplicity of EADs data is 1 (not copying the data stored on the EADs server to another EADs server), the result of this formula is 0. We recommend that you set 1 for EADs commands.