Why systemd.mountd does not always activate Volume groups(VGs) during server reboot?

Issue

• Server boots intermittently into emergency mode, having a minimal subset of the filesystems mounted each reboot
• system halt at boot time
• Packages installed for device-mapper and lvm2

device-mapper-1.02.107-5.el7.x86_64
device-mapper-event-1.02.107-5.el7.x86_64
device-mapper-event-libs-1.02.107-5.el7.x86_64
device-mapper-libs-1.02.107-5.el7.x86_64
device-mapper-persistent-data-0.5.5-1.el7.x86_64
========
lvm2-2.02.130-5.el7.x86_64
lvm2-libs-2.02.130-5.el7.x86_64

• We can not upgrade to 7.3 because our veritas product is not compatible 7.3 for the moment

# grep -i lvmetad /etc/lvm/lvm.conf
# If lvmetad is used, then see "A note about device filtering while
    # lvmetad is used" comment that is attached to global/use_lvmetad setting.
    use_lvmetad = 0

• pvscan --cache already run but issue is still there