Visible Yet Missing Logical Volumes
While working on an automated install script for an embedded board, I hit an
issue with the logical volumes never showing up in /dev/mapper
, and in turn
unable to be mounted. This left me in the dracut emergency shell (after about
three minutes), with little to go on beyond the following error:
[187.508531] dracut Warning: Could not boot.
[187.510560] dracut Warning: /dev/disk/by-uuid/5681-902D does not exist
[187.512534] dracut Warning: /dev/mapper/system-root does not exit
[187.513990] dracut Warning: /dev/system/root does not exist
After booting into a live CD I checked to make sure the volume group showed up
under pvscan
like so:
livecd ~ # pvscan
PV /dev/mmcblk0p3 VG system lvm2 [19.50 GiB / 0 free]
Total: 1 [19.50 GiB] / in use: 1 [19.50 GiB] / in no VG: 0 [0 ]
And the logical volumes were also showing up with lvscan
:
livecd ~ # lvscan
inactive '/dev/system/root' [18.45 GiB] inherit
inactive '/dev/system/swap' [1.05 GiB] inherit
Notice that they are both marked inactive? That's our issue. To fix it we can
mark all logical volumes under our volume group as active (replace system
with your volume group name):
vgchange --activate y system
This didn't fix the LVM volumes showing up at boot but it did allow me to get back into my root filesystem as a chroot so I could investigate the issue which I've finished documenting in another post.