While Checkpoint-Restart is mostly used to realize zero down-time redundancy, maintaining quorum could be another use case for industrial safety systems requiring redundancy and voting feature. Especially, voting needs proper quorum to judge safety in those systems. Therefore, whenever faulty node exist, new node is required to be added to keep proper quorum without stopping the system. In this presentation, Sungho KIM will share the use case of Linux Checkpoint-Restart functionality, CRIU, in application of safety systems and discuss feature enhancement from view points of Real-time. To copy the processing state of running node to new node joining to the quorum, CRIU will provide some solutions. However, copying process tends to impact on real-time of running nodes. Here, possible problems applying CRIU in this case and the way to avoid the problems are to be explained in a detail way.
