当出现故障的迹象时，自动地调用调试器。
At the first sign of a failure, the debugger is automatically invoked.
当出现故障时，所有工作负载从一端转移到另一端。
In a failure, all the workload from one side shifts to the other side.
当出现故障时，通过一个命令将备用系统的角色切换为主系统的角色。
In the event of a failure, the standby's role can be switched to primary with a single command.
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