系统降级运行期间使用备份模块的情况。

The use of backup module in a redundant system during degraded operation.

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本文讨论了PD M系统的备份模块和工具设计模块的设计与实现。

Backup and tool design modules of PDM are designed and implemented in this paper.

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在远程机器上生成ssh密钥和rsync守护进程，创建一个允许写的备份模块。

Establish SSH keys and an rsync daemon on the remote machine, and create a backup module to permit writes.

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