Dm Initialization Is Not Ready May 2026

If /dev/mapper/control is missing or dmsetup info fails, Device Mapper is not ready. A. Fix service ordering If you have a custom service that needs Device Mapper, add to its unit file:

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After=dm-event.service lvm2-lvmetad.service Wants=dm-event.service dracut --force # RHEL/Fedora update-initramfs -u # Debian/Ubuntu C. Load module earlier echo dm_mod >> /etc/modules-load.d/dm.conf D. Workaround: wait in script For quick testing, add a loop before using dmsetup : If /dev/mapper/control is missing or dmsetup info fails,

# Check if Device Mapper is available ls -l /dev/mapper/control dmsetup info lsmod | grep dm_mod See if LVM/DM services are active systemctl status lvm2-lvmetad lvm2-monitor dm-event Look for errors in logs journalctl -b | grep -i "dm initialization" dmesg | grep -i dm Load module earlier echo dm_mod >> /etc/modules-load

until [ -e /dev/mapper/control ]; do sleep 0.2 done Device Mapper If dm means Display Manager (e.g., SDDM, GDM, LightDM), then the error means the display manager started but X11/Wayland wasn’t ready (e.g., graphics driver, logind, or seat setup incomplete). That would require a different diagnostic path.