17.2.2 Server configuration
The example configuration shown in Figure 17‒1: Example of a system configuration using the cold standby configuration consists of two hosts (hadb01 and hadb02). The active system is hadb01, and the standby system is hadb02.
When you use the cold standby configuration, the server machines of the active system and the standby system do not need to be equivalent in terms of performance characteristics (CPU and memory size, for example). However, if performance varies between the systems, the processing performance for SQL statements might also vary after a system switchover has occurred. For this reason, we recommend that you use server machines of equivalent or nearly equivalent performance for the active and standby systems.
Note that HA Monitor's hot standby function is used in the cold standby configuration. Select either of the following as the shared disk data protection method when switching the host. We recommend that you select host reset.
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Host reset
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SCSI reservation for shared disk
If a server machine in each system contains a failure management processor (SVP shown in Figure 17‒1: Example of a system configuration using the cold standby configuration), use the recommended host reset.
The name of the failure management processor depends on the machine being used, such as SVP, BMC, or management server. For details about host reset, failure management processor, and SCSI reservation for shared disk, see the following sections in the manual HA Monitor for Linux(R) (x86):
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Host reset: Host reset
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Failure management processor: Required hardware
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SCSI reservation for shared disk: SCSI reservation for shared disk