# 确认 region 健康状态(A)

+ 定期检测集群不足三副本情况
```
./pd-ctl -u http://172.16.5.89:2679  region --jq=".regions[] | {id: .id, peer_stores: [.peers[].store_id] | select(length != 3)}"
```
![center](./student-guide/diagram/place-holder.png)

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1. 定期检测集群不足三副本情况