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WAN bandwidth is virtually variable. Since the WAN bandwidth generally has variable bandwidth characteristics that vary widely depending on the network conditions, not the guaranteed bandwidth, it is generally considered that the WAN bandwidth is estimated to be 1 to 10 MbMB/s, It is appropriate. Also, it is not recommended to consider disabling of DRX buffering because the maximum I/O measured within a period of time is lower than the replication bandwidth. Depending on the characteristics of the application in the operating environment, there may be a situation in which the maximum I/O surges at an unspecified point. Therefore, it is preferable to allocate free space in the DRX buffer for this situation.

The following is an example of determining the physical memory specification assuming a WAN 100 Mbps bandwidth, a maximum I/O of 200 100 MB/s, and a maximum I/O duration of 30 seconds. In this example, the required memory for one replication resource operation is 8GB 6.7GB (16GB recommended).

The following is an example of determining the physical memory specification assuming a WAN 100 Mbps bandwidth, a maximum I/O of 500 MB/s, and a maximum I/O duration of 30 seconds. In this example, the required memory for one replication resource operation is 20.7GB (32GB recommended).