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Windows 2008 or later, Linux CentOS 6.4 or later, Ubuntu 12.04 LTS or later 64-bit platforms are supported.

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• resource count * (max I/O(MB/s) - bandwidth(MB/s)) * max I/O maintained interval (sec) + (resource count * compression/encryption buffer(100MB)) + DRX default memory(100MB2GB)

If the maximum I/O is always lower than the bandwidth, the physical memory specification is determined by calculating the per-resource buffer size as 1 GB1GB.

• resource count * 1GB +  (resource count * compression/encryption buffer(100MB)) + DRX default memory(100MB)2GB)

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 Mb/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 MB/s, and a maximum I/O duration of 10 30 seconds. In this example, the required memory for one replication resource operation is 2.1 GB (4 GB recommended) and enters the congestion state when the maximum I / O lasts more than 10 seconds8GB (16GB recommended).

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