如果出现临时系统错误、网络故障或服务不可用，准备调用过程中使用的数据将丢失。
If temporary system errors, network failures, or service unavailability occur, the data used in preparation of the call is lost.
如果主服务器不可用，但客户机尚具有网络连接，就需要故障转换到备用服务器，而不是使用系统时间。
If the primary server is unavailable, but the client still has network connectivity, you want to fail over to a secondary server as opposed to using system time.
这可以使用已知的方法实现，如在自已的系统上放置部署管理器和使用操作系统故障转移机制(例如，用于AIX的HACMP)来保护系统。
This can be done using known techniques, such as placing the Deployment Manager on its own system, and protecting that system with an operating system failover mechanism (for example, HACMP for AIX).
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