LVM2-ACTIVATION-GENERATOR(8) LVM2-ACTIVATION-GENERATOR(8)
NAME
lvm2-activation-generator - generator for systemd units to activate LVM2 volumes on boot
SYNOPSIS
/usr/lib/systemd/system-generators/lvm2-activation-generator
DESCRIPTION
The lvm2-activation-generator is called by systemd(1) on boot to generate systemd units at runtime to activate
LVM2 volumes if lvmetad(8) is disabled (global/use_lvmetad=0 lvm.conf(5) option is used). Otherwise, if
lvmetad(8) is enabled, the lvm2-activation-generator exits immediately without generating any systemd units
and LVM2 fully relies on event-based activation to activate the LVM2 volumes instead using the pvscan(8) (pvs‐
can --cache -aay) call that is a part of udev(8) rules.
These systemd units are generated by lvm2-activation-generator:
lvm2-activation-early.service used for activation of LVM2 volumes that is ordered before systemd's special
cryptsetup.target to support LVM2 volumes which are not layered on top of encrypted devices.
lvm2-activation.service used for activation of LVM2 volumes that is ordered after systemd's special crypt‐
setup.target to support LVM2 volumes which are layered on top of encrypted devices.
lvm2-activation-net.service used for activation of LVM2 volumes that is ordered after systemd's special
remote-fs-pre.target to support LVM2 volumes which are layered on attached remote devices.
Note that all the underlying devices (Physical Volumes) need to be present when the service is run. If the
there are any devices presented in the system anytime later, any LVM2 volumes on top of such devices need to
be activated directly by lvchange(8) or vgchange(8). This limitation does not exist when using lvmetad(8) and
accompanying event-based activation since such LVM volumes are activated automatically as soon as the Volume
Group is ready (all the Physical Volumes making up the Volume Group are present in the system).
The lvm2-activation-generator implements the Generators Specification as referenced in systemd(1).
SEE ALSO
lvm.conf(5) vgchange(8) lvchange(8) lvmetad(8) pvscan(8) udev(7) systemd(1) systemd.target(5) systemd.spe‐
cial(7)
Red Hat, Inc LVM TOOLS 2.02.166(2)-RHEL7 (2016-11-16) LVM2-ACTIVATION-GENERATOR(8)
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