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Jul 30, 2020
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Update backup-and-restore-tool.md (#4121) #4122

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3 changes: 2 additions & 1 deletion br/backup-and-restore-tool.md
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Expand Up @@ -78,7 +78,6 @@ BR 由多层命令组成。目前，BR 包含 `backup`、`restore` 和 `version`

* `br backup` 用于备份 TiDB 集群
* `br restore` 用于恢复 TiDB 集群
* `br version` 用于查看 BR 工具版本信息

以上三个子命令可能还包含这些子命令：

Expand All @@ -90,6 +89,7 @@ BR 由多层命令组成。目前，BR 包含 `backup`、`restore` 和 `version`

* `--pd`：用于连接的选项，表示 PD 服务地址，例如 `"${PDIP}:2379"`。
* `-h`/`--help`：获取所有命令和子命令的使用帮助。例如 `br backup --help`。
* `-V` (或 `--version`): 检查 BR 版本。
* `--ca`：指定 PEM 格式的受信任 CA 的证书文件路径。
* `--cert`：指定 PEM 格式的 SSL 证书文件路径。
* `--key`：指定 PEM 格式的 SSL 证书密钥文件路径。
Expand Down Expand Up @@ -119,6 +119,7 @@ mysql -h${TiDBIP} -P4000 -u${TIDB_USER} ${password_str} -Nse \
> **注意：**
>
> + 经测试，在全速备份的情况下，如果备份盘和服务盘不同，在线备份会让只读线上服务的 QPS 下降 15%~25% 左右。如果希望降低影响，请参考 `--ratelimit` 进行限速。
>
> + 假如备份盘和服务盘相同，备份将会和服务争夺 I/O 资源，这可能会让只读线上服务的 QPS 骤降一半以上。请尽量禁止将在线服务的数据备份到 TiKV 的数据盘。

{{< copyable "shell-regular" >}}
Expand Down