冗余设备是指使用两条总线电缆，实现物理介质和物理层的冗余。
... redundancy computer system,冗余计算机系统 redundancy unit,冗余单元；冗余设备 redundant information,冗余信息 ...
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我们每个月的基础设施花费（包括了冗余设备、阶段和测试环境）大约只需要$2500（这简直太疯狂了！）
Our monthly infrastructure bill including redundant prod, stage, and test environments in roughly $2500/month (this is insane!)
如果这样做，一定要确保共用分页空间设备数量与冗余的共享内存分区的数量匹配。
When you do so, make sure the number of common paging space devices matches the number of redundant shared memory partitions.
hmc会自动地识别出这个设备是冗余的并相应地配置它。
The HMC automatically recognizes that the device is redundant and configures it accordingly.
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