Consultation on Storage Scheduling Issues

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

Original topic: 存储调度问题请教

| username: magongyong

[Test Environment for TiDB]
[TiDB Version]
[Reproduction Path] What operations were performed when the issue occurred
[Encountered Issue: Problem Phenomenon and Impact]

Preparing to scale out the existing cluster. Previously, the configuration of a single server was 64c, 256G, 3.2T * 2 = 6.4T NVMe SSD.
Now preparing to scale out with high-configuration servers, where the configuration of a single server is 128c, 512G, 6.4T * 4 = 25.6T NVMe SSD.
I would like to ask, in this situation, will there be a case where the disk space of the originally low-configuration servers is fully occupied, while the high-configuration servers still have a lot of space left?

[Resource Configuration] Go to TiDB Dashboard - Cluster Info - Hosts and take a screenshot of this page
[Attachments: Screenshots/Logs/Monitoring]

| username: magongyong | Original post link

Check the official documentation. It calculates the remaining space based on scheduling. I wonder if anyone has practiced this and whether it will automatically balance.

| username: tidb菜鸟一只 | Original post link

Increase the weight of the newly expanded server.

| username: xingzhenxiang | Original post link

In theory, the spatial ratio should be similar.

| username: magongyong | Original post link

Okay, thank you.

| username: magongyong | Original post link

Yes, according to the official website, it seems like that. I’m not sure if anyone has actually deployed it this way. I’m just worried that after purchasing a batch of high-performance servers, the cluster might still face load imbalance issues, which would be really unfortunate.

| username: xingzhenxiang | Original post link

Try to keep resources consistent to avoid trouble later.

| username: magongyong | Original post link

Yes, that’s right.

| username: system | Original post link

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.