Scale-out switch planes are IP-based rather than PCIe-based

The reasons are as follows:
1. The IP switching technology is a common and mature practice in the industry. The IP protocol has been the de facto standard of data center standards. The IP switching complies with Huawei's ALL IP development trend.
2. For mid-range storage arrays, using IP switches can save the cost. PCIe switches are for specific purposes and bring higher costs. It is applicable to high-end storage.
3. The iWARP based on the IP protocol is a high-performance transmission technology. Its latency meets requirements of mid-range storage.

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