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Replication Recently, replication configurations with through VMs are becoming increasingly more common in virtualized environments. A characteristic of these environments is that virtualization environments, but there are cases where the CPU or memory resources allocated to individual VMs are not always sufficient. For example, if an individual VM is configured with 2 cores and 2-4 GB of 1 core CPU and 1~2GB memory, it may will not meet the minimum configuration specifications for of bsr. When a replication environment is configured with such low-spec end VMs, it is more likely to experience frequent performance delays inside the bsr engine and network performance delays due to frequent CPU context switching, and thus inter-node communication (keep alive) delays between nodes. While there is no problem with the basic behavior, as the I/O load increases or the frequency of interrupts in the HW layer of the system increases, the performance of the VM as a whole will decrease, and bsr will be affected accordingly. The bottom line is that building a replication environment on low-specification VMs has limitations.There's not much you can do about it except to make sure you have plenty of system configuration , become frequent. Operating replication on VMs in this environment has severe limitations. There is no solution to this problem other than freeing up system resources.