> For the complete documentation index, see [llms.txt](https://docs.verge.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.verge.io/run-the-platform/zh/cun-chu/preferred-tiers.md).

# 首选层级

该 *首选层级* 该设置将为要使用的存储层建立一个“首选项”。如果该层不可用，或者该层空间不足，系统将自动切换到下一个更便宜（编号更高）的层；如果该层也不可用，则切换到再下一个更便宜的层。如果指定的首选层不可用，并且也没有更便宜的层可用，系统将切换到下一个更昂贵（编号更低）的层。

## 首选层示例

**下图显示了一个示例，其中已将第 4 层指定为首选层：**

![preferredtier.png](/files/627d725ec6190e14fed59e87bb0c441a14ce9f99)


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