It consists of a pair of servers - the primary and the HDR secondary - and supports both synchronous and asynchronous replication modes.

它由一对服务器组成—主服务器和HDR备用服务器—并且同时支持异步和同步复制模式。

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We concluded with a detailed explanation on blocking checkpoints on primary in an HDR environment.

最后，我们对HDR环境中主要服务器上阻塞的检查点进行了详细说明。

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One characteristic of HDR is that it USES a half duplex communication protocol and thus is sensitive to network latency.

HDR的一个特点是它使用半双工通信协议，因此对网络延迟非常敏感。

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