The Problem
The LVM commands showing below errors:
# pvs WARNING: Failed to connect to lvmetad. Falling back to device scanning. <<< PV VG Fmt Attr PSize PFree /dev/sd[X][partition_number] [vg_name] lvm2 a-- [size]g [available_free_space]g
# vgs WARNING: Failed to connect to lvmetad. Falling back to device scanning. <<< VG #PV #LV #SN Attr VSize VFree [vg_name] [number_of_pvs] [number of lvs] 0 wz--n- [size]g [available_free_space]g
# lvs WARNING: Failed to connect to lvmetad. Falling back to device scanning. <<< LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert [lv_name] [vg_name] -wi-ao---- [size]g
Error from /var/log/messages file:
# grep lvmetad /var/log/messages Sep 8 20:34:29 [hostname] systemd: Cannot add dependency job for unit lvm2-lvmetad.socket, ignoring: Unit is masked. Sep 8 20:34:29 [hostname] lvm: WARNING: Failed to connect to lvmetad. Falling back to device scanning. Sep 8 20:34:31 [hostname] lvm: WARNING: Failed to connect to lvmetad. Falling back to device scanning. Sep 8 20:34:31 [hostname]t lvm: pvscan[642] activating all directly (lvmetad unused) 8:17 Sep 8 20:34:31 [hostname] lvm: WARNING: Autoactivation reading from disk instead of lvmetad. Sep 8 20:34:31 [hostname] lvm: WARNING: Failed to connect to lvmetad. Falling back to device scanning. Sep 8 20:34:31 [hostname] lvm: pvscan[644] activating all directly (lvmetad unused) 8:2 Sep 8 20:34:31 [hostname] lvm: WARNING: Autoactivation reading from disk instead of lvmetad.
The Solution
The lvm2-lvmetad.service and lvm2-lvmetad.socket services were disabled without following proper steps. The /etc/lvm/lvm.conf is configured to use use_lvmetad, where as the lvm2-lvmetad.service and lvm2-lvmetad.socket services were masked.
# grep "use_lvmetad =" /etc/lvm/lvm.conf use_lvmetad = 1
# systemctl status lvm2-lvmetad.service ● lvm2-lvmetad.service Loaded: masked (/dev/null; bad) >>>>> Masked Active: inactive (dead) Warning: lvm2-lvmetad.service changed on disk. Run 'systemctl daemon-reload' to reload units.
# systemctl status lvm2-lvmetad.socket ● lvm2-lvmetad.socket Loaded: masked (/dev/null; bad) >>>>> Masked Active: inactive (dead) Sep 08 20:34:29systemd[1]: Cannot add dependency job for unit lvm2-lvmetad.socket, ignoring: Unit is masked. Sep 08 20:34:32 systemd[1]: Cannot add dependency job for unit lvm2-lvmetad.socket, ignoring: Invalid request descriptor Sep 08 20:34:38 systemd[1]: Cannot add dependency job for unit lvm2-lvmetad.socket, ignoring: Unit is masked. Sep 08 20:34:38 systemd[1]: Cannot add dependency job for unit lvm2-lvmetad.socket, ignoring: Unit is masked. Warning: lvm2-lvmetad.socket changed on disk. Run 'systemctl daemon-reload' to reload units.
- Unmask the lvm2-lvmetad.socket and lvm2-lvmetad.service first. Then start and enable the services on boot with below commands.
# systemctl unmask lvm2-lvmetad.service lvm2-lvmetad.socket # systemctl start lvm2-lvmetad.service lvm2-lvmetad.socket # systemctl enable lvm2-lvmetad.service lvm2-lvmetad.socket
If lvm2-lvmetad.socket and lvm2-lvmetad.service needs to be disabled then the /etc/lvm/lvm.conf requires to be configured not to use "use_lvmetad". (i.e use_lvmetad = 0)