16.2.2 Server configuration
The example configuration shown in Figure 16‒1: Example of a system configuration using the multi-node function consists of three nodes (hadb01, hadb02, and hadb03. The master node is hadb01, and hadb02 and hadb03 are slave nodes.
When you use the multi-node function, the server machines on the individual nodes do not need to have the same performance (in CPU and memory size, for example). However, if performance varies among the individual server machines, the processing performance for SQL statements might also vary depending on the connected node. Therefore, we recommend that you keep the performance of the server machines on all nodes as close to the same as possible.
Note that the multi-node function uses the hot standby function of HA Monitor. Select one of the following as the shared disk data protection method used when switching hosts. We recommend that you select host reset.
-
Host reset
-
SCSI reservation for shared disk
Use the recommended host reset method when there are failure management processors (the SVPs shown in Figure 16‒1: Example of a system configuration using the multi-node function) deployed on the server machines in all nodes.
For details about host reset, failure management processors, and SCSI reservation for shared disk, see the following sections in the manual HA Monitor for Linux(R) (x86):
-
Host reset: Host reset
-
Failure management processor: Required hardware
-
SCSI reservation for shared disk: SCSI reservation for shared disk