In this way, mapping of placement groups (and replicas) to storage devices does not rely on any metadata but instead on a pseudo-random mapping function.
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
To encrypt a byte, we xor this pseudo-random byte with the byte we want to encrypt.
对一个字节进行加密，我们对伪随机字节和要加密的字节进行异或运算。
3
Each data packet is transmitted on a different frequency channel, following a pseudo-random hopping sequence determined by the device address of the master device.