Failover is the planned or unplannedshutdown of the primary system and includes the accompanying task of bringing a standby node online to take over the processing load.
故障转移是主系统在计划内或计划外的关闭，并包括完成将备用节点置于在线以接管处理负载的任务。
3
Restarting may be needed after a planned shutdown, after an unplanned machine failure, or in order to replay a model event of scientific interest with a different time step granularity.