The IO usage of TiDB is always high, but the actual disk IO is not high, seeking solution

This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: TIDB的IO使用率总是很高,但实际磁盘IO并不高,求解

| username: 奋斗的大象

【TiDB Usage Environment】Production Environment
【TiDB Version】6.10
【Reproduction Path】What operations were performed when the issue occurred
【Encountered Issue: Issue Phenomenon and Impact】
【Resource Configuration】Go to TiDB Dashboard - Cluster Info - Hosts and take a screenshot of this page
【Attachments: Screenshots/Logs/Monitoring】
The IO on the TiDB console is often maxed out

But the backend disk monitoring shows read/write speeds below 100M/S

Can any expert analyze the reason?

| username: tidb狂热爱好者 | Original post link

IOPS has already reached 2000, which is the bottleneck for mechanical drives. Read/write speed is 25MB/s.

| username: 啦啦啦啦啦 | Original post link

Is it an NVME drive?