Quote: for fault-tolerance, use swact (switch of activity) between active and passive forms of an application; passive form only keeps track of state of active form; resynchronizes on recovery

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There must not be more than 10^4 loss … fault tolerance mechanisms have to be implemented. … An active/passive replication scheme has been chosen [Guerraoui, R., Schiper, A., Ada Europe '96, LNCS 1088]. In order to cope with real time constraints no group … [ref]. This means that every software application is duplicated. [Each application] has an active form which performs the regular work and … less resource than the active one. … After a fault, the passive switches to active … swact, which stands for switch of activity. In … update message was sent. Therefore a swact may … resuming its nominal activities, it must be resynchronized …   Google-1   Google-2

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