btrfs_device_read_errors.md 1.9 KB
Understand the alert
This alert monitors the number of BTRFS read errors on a device. If you receive this alert, it means that your system has encountered at least one BTRFS read error in the last 10 minutes.
What are BTRFS read errors?
BTRFS (B-Tree File System) is a modern file system designed for Linux. BTRFS read errors are instances where the file system fails to read data from a device. This can occur due to various reasons like hardware failure, file system corruption, or disk problems.
Troubleshoot the alert
- Check system logs for BTRFS errors
Review the output from the following command to identify any BTRFS errors:
sudo journalctl -k | grep -i BTRFS
- Identify the affected BTRFS device and partition
List all BTRFS devices with their respective information by running the following command:
sudo btrfs filesystem show
- Perform a BTRFS filesystem check
To check the integrity of the BTRFS file system, run the following command, replacing <device> with the affected device path:
sudo btrfs check --readonly <device>
Note: Be careful when using the --repair option, as it may cause data loss. It is recommended to take a backup before attempting a repair.
- Verify the disk health
Check the disk health using SMART tools to determine if there are any hardware issues. This can be done by first installing smartmontools if not already installed:
sudo apt install smartmontools
Then running a disk health check on the affected device:
sudo smartctl -a <device>
- Analyze the read error patterns
If the read errors are happening consistently or increasing, consider replacing the affected device with a new one or adding redundancy to the system by using RAID or BTRFS built-in features.