To use the multi-connection address facility, the -m option of the pdstart operand must be specified in the system common definition. To also use the system switchover facility, the -n option must be specified in addition to the -m option.

The HiRDB client specifies in the -m and -n options the host name of the HiRDB system to which connection can be established in the network; this does not have to be the host name specified in the pdunit operand.

(a) HiRDB/Single Server

Figure 23-2 provides an example of a network configuration and definition when the multi-connection address facility is used with a HiRDB/Single Server.

Figure 23-2 Example of network configuration and definition: HiRDB/Single Server

Explanation:

• The host name (HS01) used for the network communications between the HiRDB systems is specified in the -x option of the pdunit operand.
• The host name (he01) in the network that is used between the HiRDB client and the HiRDB/Single Server is specified in the -m option of the pdstart operand.
• The host name (he01) in the network that is used between the HiRDB client and the HiRDB/Single Server is specified in the PDHOST operand in the client environment definition.

(b) HiRDB/Parallel Server

Figure 23-3 provides an example of a network configuration and definition when the multi-connection address facility is used with a HiRDB/Parallel Server.

Figure 23-3 Example of network configuration and definition: HiRDB/Parallel Server

Explanation:

• The host names (HS01 and HS02) used for the network communications between the HiRDB systems are specified in the -x option of the pdunit operand.
• The host name (he03) in the network that is used between the HiRDB client and the HiRDB system is specified in the -m option of the pdstart operand (for defining the front-end server).
• The host name (he01) where the system manager is located in the network that is used between the HiRDB client and the HiRDB system is specified in the PDHOST operand in the client environment definition.

(c) HiRDB/Parallel Server (with inheritance of IP addresses during system switchover)

Figure 23-4 provides an example of a network configuration and definition when the multi-connection address facility is used and IP addresses are inherited during system switchover.

Figure 23-4 Example of network configuration and definition: With inheritance of IP addresses during system switchover

Explanation:

• The host names (HS01 and HS03) used for the network communications between the HiRDB systems are specified in the -x option of the pdunit operand.
• The host name (he04) in the network that is used between the HiRDB client and the HiRDB system is specified in the -m option of the pdstart operand (for defining the front-end server). The host name of the secondary system (he04) is specified in the -n option.
• The host name (he01) where the system manager is located in the network that is used between the HiRDB client and the HiRDB system is specified in the PDHOST operand in the client environment definition.

(d) HiRDB/Parallel Server (without inheritance of IP addresses during system switchover)

Figure 23-5 provides an example of a network configuration and definition when the multi-connection address facility is used and IP addresses are not inherited during system switchover.

Figure 23-5 Example of network configuration and definition: Without inheritance of IP addresses during system switchover

Explanation:

• The host names (HS01 and HS03) used for the network communications between the HiRDB systems are specified in the -x option of the pdunit operand. The host name of the secondary system (HS02) is specified in the -c option.
• The host name (he04) in the network that is used between the HiRDB client and the HiRDB system is specified in the -m option of the pdstart operand (for defining the front-end server). The host name of the secondary system (he03) is specified in the -n option.
• The host name (he01) where the system manager is located in the network that is used between the HiRDB client and the HiRDB system is specified in the PDHOST operand in the client environment definition. The host name of the secondary system (he03) is also specified.