Table 25-5 shows the application criteria for the system switchover facilities.
Table 25-5 System switchover facility application criteria
Importance | Standby system switchover facility | Standby-less system switchover (1:1) facility | Standby-less system switchover (effects distributed) facility |
---|---|---|---|
Transaction performance | Best | Poor | Good |
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Resource requirement | Poor | Best | Best |
Needs standby server machines or system resources for standby units. | Does not need standby server machines or system resources for standby units. | Does not need standby server machines or system resources for standby units. | |
Handling of a series of errors | Best | Poor | Best |
Can handle based on linkage with cluster software (only when IP addresses are inherited, and not when the rapid system switchover facility is used). | Cannot handle because there is only one fixed alternate server. | Can handle based on linkage with cluster software. |
Table 25-6 shows when each system switchover facility can be applied to a unit when a different system switchover facility is already being applied to another unit within the same system.
Table 25-6 Usability of each system switchover facility when another system switchover facility is already being used for another unit within the same system
Facility already being used | Usability of the standby system switchover facility | Usability of the standby-less system switchover (1:1) facility | Usability of the standby-less system switchover (effects distributed) facility |
---|---|---|---|
Standby system switchover facility | Y | Y | Y |
Standby-less system switchover (1:1) facility | Y | Y | N |
Standby-less system switchover (effects distributed) facility | Y | N | Y* |