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### Understand the alert
This alert presents the average `I/O latency` over the last 10 seconds. `I/O latency` is the time that is required to complete a single I/O operation on a block device.
This alert might indicate that your disk is under high load, or that the disk is slow.
### Troubleshoot the alert
1. Check per-process I/O usage:
Use `iotop` to see the processes that are the main I/O consumers:
```
sudo iotop
```
If you don't have `iotop` installed, then [install it](https://www.tecmint.com/iotop-monitor-linux-disk-io-activity-per-process/)
2. Analyze the running processes:
Investigate the top I/O consumers and determine if these processes are expected to consume that much I/O, or if there might be an issue with these processes.
3. Minimize the load by closing any unnecessary main consumer processes:
If you find that any unnecessary or unexpected processes are heavily utilizing your disk, try stopping or closing those processes to reduce the load on the disk. Always double-check if the process you want to close is necessary.
4. Verify your disk health:
Make sure your disk is not facing any hardware issues or failures. For this, you can use the `smartmontools` package, which contains the `smartctl` utility. If it's not installed, you can [install it](https://www.smartmontools.org/wiki/Download).
To check the disk health, run:
```
sudo smartctl -a /dev/sdX
```
Replace `/dev/sdX` with the correct disk device identifier (for example, `/dev/sda`).
5. Consider upgrading your disk:
If your disk consistently experiences high latency and you have already addressed any performance issues with the running processes, consider upgrading your disk to a faster drive (e.g., replace an HDD with an SSD).
### Useful resources
1. [iotop - Monitor Linux Disk I/O Activity](https://www.tecmint.com/iotop-monitor-linux-disk-io-activity-per-process/)
2. [smartmontools - SMART monitoring tools](https://www.smartmontools.org/)
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