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Update upgrade-tidb-using-tiup.md (pingcap#4170)
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* Update upgrade-tidb-using-tiup.md

* Update upgrade-tidb-using-tiup.md

Co-authored-by: TomShawn <[email protected]>

* Update upgrade-tidb-using-tiup.md

Co-authored-by: TomShawn <[email protected]>
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lucklove and TomShawn authored Aug 4, 2020
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Expand Up @@ -82,6 +82,7 @@ tiup update cluster

> **注意:**
>
> + 目前 TiUP 仅支持 `systemd` 的进程管理模式。如果此前使用 TiDB Ansible 部署时选择了 `supervise`,需要先按[使用 TiDB Ansible 部署 TiDB 集群](/online-deployment-using-ansible.md#如何调整进程监管方式从-supervise-到-systemd)迁移到 `systemd`
> + 如果原集群已经是 TiUP 部署,可以跳过此步骤。
> + 目前默认识别 `inventory.ini` 配置文件,如果你的配置为其他名称,请指定。
> + 你需要确保当前集群的状态与 `inventory.ini` 中的拓扑一致,并确保集群的组件运行正常,否则导入后会导致集群元信息异常。
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