DMDS adopts pair of system back-up and mirror-back-up memory technology. So the system has high reliability of metadata management.

具有容错能力的双元数据服务器采用双系统备份、镜像复制存储技术，从而保证了元数据管理的高可靠。

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At a convenient time, we'd want to shut down the system, replace the failed drive, and start the system back up again.

在方便的时侯，我们将希望关闭系统，更换故障驱动器，并且重新启动系统。

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And yet it is a miracle that Voyager 2 managed to send anything back at all, for its main radio system failed soon after launch, and its back-up system proved to be faulty.

ECONOMIST: The long arm of the celestial repairman

The Post reported that a malfunction in Mir's attitude-control system also occurred in March, causing it to list until an alternate back-up system was activated.

CENTERFORSECURITYPOLICY: Center For Security Policy

Experts say that it is possible for this system and its back-up computers to be disabled by lightning.

CNN: Could lightning have brought down Air France plane?