In this way, mapping of placement groups (and replicas) to storage devices does not rely on any metadata but instead on a pseudo-random mappingfunction.
这样一来，放置组(以及副本)到存储设备的映射就不用依赖任何元数据，而是依赖一个伪随机的映射函数。
2
The login module must retrieve the current identity and then use a mappingfunction to come up with a new identity.
登录模块必须检索当前标识，然后使用映射函数生成一个新的标识。
3
When the AIX code-set conversion function gets a request with non-AIX code set names, the alias mappingfunction attempts to map suitable AIX code set names for the request.