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Troubleshooting Drive Unmounting with systemd Automount

Problem

Unable to unmount media drives due to systemd automount automatically remounting them when accessed.

Diagnosis Steps

1. Check Current Mount Status

mount | grep -E "(media|share|cloud-backups|navidrome)"
df -h | grep -E "(media|share|cloud-backups|navidrome)"

2. Identify Processes Using the Drives

fuser -v /mnt/media /mnt/media2 /mnt/media3
lsof +D /mnt 2>/dev/null | head -20

3. Check for systemd Automount Units

systemctl list-units --all | grep -E "(automount|mount)" | grep -E "(media|cloud|navidrome)"

4. Check Docker Container Usage

docker ps --format "table {{.Names}}\t{{.Mounts}}" | grep -i media
find /home/bowlinedandy/homelab -name "docker-compose.yml" -exec grep -l "/mnt/media" {} \;

Root Cause

systemd automount units automatically remount drives when they are accessed, even after manual unmounting. The drives were managed by these automount units:

  • mnt-media.automount
  • mnt-media2.automount
  • mnt-media3.automount
  • mnt-navidrome.automount
  • mnt-cloud\x2dbackups.automount

Solution

Stop Automount and Unmount Drives

# Media drives
sudo systemctl stop mnt-media.automount mnt-media2.automount mnt-media3.automount
sudo umount /mnt/media /mnt/media2 /mnt/media3

# Navidrome and cloud-backups
sudo systemctl stop mnt-navidrome.automount mnt-cloud\\x2dbackups.automount
sudo umount /mnt/navidrome /mnt/cloud-backups

Prevent Auto-start on Reboot (Optional)

# Media drives
sudo systemctl disable mnt-media.automount mnt-media2.automount mnt-media3.automount

# Navidrome and cloud-backups  
sudo systemctl disable mnt-navidrome.automount mnt-cloud\\x2dbackups.automount

Key Findings

Drive Status Before Unmounting

  • /mnt/media (7.3T, 91% full) - /dev/sdc1
  • /mnt/media2 (13T, 97% full) - /dev/sde1
  • /mnt/media3 (3.6T, 100% full) - /dev/sdf1
  • /mnt/navidrome (916G, 62% full) - /dev/sdb1
  • /mnt/cloud-backups (7.3T, 93% full) - /dev/sdd1

mergerfs Status

The media-merged mergerfs drive was already inactive:

  • No active mergerfs processes running
  • systemd unit mnt-media\x2dmerged-share.mount was in "loaded inactive dead" state
  • mergerfs automatically becomes unavailable when underlying drives are unmounted

Notes

  • Use escaped characters (\\x2d) in systemctl commands for mount names with hyphens
  • systemd automount will remount drives on any access, including simple ls commands
  • mergerfs mounts depend on their underlying drives being available
  • Always check for Docker containers that might be using the mounts before unmounting