sca调用同时支持同步和异步模式。
SCA invocation supports both synchronous and asynchronous patterns.
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。
It consists of a pair of servers - the primary and the HDR secondary - and supports both synchronous and asynchronous replication modes.
DRBD支持两个模式的写操作，即完全同步和完全异步。
DRBD supports two modes for Write operations called fully synchronous and asynchronous.
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