提出了一种支持高可用的数据放置算法。

An algorithm for data placement is proposed, which supports high availability.

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该层通过传统的数据放置算法（考虑地理布局）实现各种功能，比如复制和数据简缩。

This layer implements a variety of features, such as replication and data reduction, over the traditional data-placement algorithms (with consideration for geographic placement).

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最后，放置组到对象存储设备的映射是一个伪随机映射，使用一个叫做Controlled Replication Under Scalable Hashing (CRUSH)的算法。

Finally, the mapping of the placement group to object storage devices is a pseudo-random mapping using an algorithm called Controlled Replication Under Scalable Hashing (CRUSH).

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