[Bug]: Disk I/O Monitoring Unreliable After Reboot Due to Non-Persistent Device Names

[Korveck14]

Component

Agent

Description

After system reboot, Disk I/O monitoring tracks the wrong physical disks. I have multiple SATA disks, and the Linux kernel assigns /dev/sda, /dev/sdb, etc., randomly based on detection order during boot. This causes I/O metrics to be assigned to incorrect physical disks. Could you look into it?

Expected Behavior

I/O metrics across all disk consistent after system reboot.

Steps to Reproduce

1. Set up Disk I/O monitoring for a specific disk (e.g., /dev/sdb)
2. Reboot the system
3. Observe that metrics now track whatever disk happened to get assigned that device name

Category

Metrics

Affected Metrics

Storage

OS / Architecture

linux/amd64 (agent)

Beszel version

0.13.2

Installation method

Docker

Configuration

    volumes:
      - /mnt:/extra-filesystems/sda1__Media:ro
      - /backup:/extra-filesystems/sdb1__Backup:ro

Hub Logs

Agent Logs

[henrygd]

Have you tried not specifying the device name in the mount? In most cases it should be able to pick up the correct device for I/O automatically:

    volumes:
      - /mnt:/extra-filesystems/media__Media:ro
      - /backup:/extra-filesystems/backup__Backup:ro

This doesn't always work (for example if the device is encrypted it probably will not) so let me know if you don't have luck with this approach.

[Korveck14]

It is not working, for reference these are my disks and they are not encrypted

NAME     SIZE FSTYPE MOUNTPOINT LABEL
sda    476.9G
├─sda1   976M vfat   /boot/efi
├─sda2 460.2G ext4   /
└─sda3  15.8G swap   [SWAP]
sdb      1.9T
└─sdb1   1.9T ext4   /mnt       data

I also tried specifying the label with no luck:

    volumes:
      - /mnt:/extra-filesystems/data__Media:ro

[com6056]

Also having this issue, I have my disks defined as such:

    volumes:
      - /mnt/disk01/.beszel:/extra-filesystems/disk01:ro
      - /mnt/disk02/.beszel:/extra-filesystems/disk02:ro
      - /mnt/disk03/.beszel:/extra-filesystems/disk03:ro
      - /mnt/disk04/.beszel:/extra-filesystems/disk04:ro
      - /mnt/disk05/.beszel:/extra-filesystems/disk05:ro
      - /mnt/disk06/.beszel:/extra-filesystems/disk06:ro
      - /mnt/parity01/.beszel:/extra-filesystems/parity01:ro

And I get no disk I/O stats and this shows up in the agent logs:

2025/11/17 00:20:26 WARN Device not found in diskstats name=disk06
2025/11/17 00:20:26 WARN Device not found in diskstats name=parity01
2025/11/17 00:20:26 WARN Device not found in diskstats name=disk01
2025/11/17 00:20:26 WARN Device not found in diskstats name=disk02
2025/11/17 00:20:26 WARN Device not found in diskstats name=disk03
2025/11/17 00:20:26 WARN Device not found in diskstats name=disk04
2025/11/17 00:20:26 WARN Device not found in diskstats name=disk05