可以将数据持久性定义为程序和存储设备之间达成的契约，该契约指定如何存储和检索数据。
Data persistence can be defined as a contract, negotiated between a program and a storage device, that specifies how data are to be stored and retrieved.
Symbolic Name—设备的符号名(人们可读)—调用程序随意指定的一个名称，比如xi50e。
Symbolic name — Symbolic (human-readable) name of the device — an arbitrary name that the caller specifies, such as xi50e.
指定应用程序域并不能防止管理软件轮询设备级指标，如设备加载、CPU 利用、内存指标以及环境统计数据。
Specifying an application domain does not prevent management software from polling device-level metrics such as device load, CPU utilization, memory metrics, and environmental statistics.
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