In this configuration, two back-end servers become each other's alternate BESs. The following figure shows a system configuration example of a mutual alternating configuration.

Figure 26-68 System configuration example of a mutual alternating configuration

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When the cluster software product being used is HA Monitor, Hitachi HA Toolkit Extension is not required.

Explanation

• BES1 is the alternate BES for BES2. When an error occurs in BES2, the alternate portion of BES2 takes over the BES2 processing.
• BES2 is the alternate BES for BES1. When an error occurs in BES1, the alternate portion of BES1 takes over the BES1 processing.

This configuration alternates only in a single direction in the standby-less system switchover (1:1) facility. The following figure shows a system configuration example of a one-way alternating configuration (2-node configuration).

Figure 26-69 System configuration example of a one-way alternating configuration (2-node configuration)

#

When the cluster software product being used is HA Monitor, Hitachi HA Toolkit Extension is not required.

Explanation

BES2 is the alternate BES for BES1. When an error occurs in BES1, the alternate portion of BES1 takes over the BES1 processing. When an error occurs in BES2, BES1 does not take over the BES2 processing.

The figure below shows a system configuration example combining standby-less (1:1) and standby system switchover type systems. For a HiRDB system creation example of this system configuration, see HiRDB parallel server configuration: when the standby-less system switchover (1:1) facility is used in the manual HiRDB Version 9 System Definition.

Figure 26-70 System configuration example combining standby-less (1:1) and standby system switchover type systems

#

When the cluster software product being used is HA Monitor, Hitachi HA Toolkit Extension is not required.

Explanation

• The standby system switchover facility (mutual system switchover configuration) is applied to the MGR, FES, and DS units. To simplify operations when the system is switched, a configuration that inherits IP addresses is used. User server hot standby is also used.
• The standby-less system switchover (1:1) facility (mutual alternate configuration) is applied to BES units.
• HiRDB Advanced High Availability must be installed on all server machines. HiRDB Advanced High Availability is also required on server machines for which neither the standby-less system switchover facility nor the system switchover facility is appropriate.