LVM2-ACTIVATION-GENERATOR(8)LVM2-ACTIVATION-GENERATOR(8)NAMElvm2-activation-generator - generator for systemd units to activate
LVM2 volumes on boot
SYNOPSIS
/lib/systemd/system-generators/lvm2-activation-generator
DESCRIPTION
The lvm2-activation-generator is called by systemd(1) on boot to gener‐
ate 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 immedi‐
ately without generating any systemd units and LVM2 fully relies on
event-based activation to activate the LVM2 volumes instead using the
pvscan(8) (pvscan --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 cryptsetup.target to support LVM2 vol‐
umes 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 limi‐
tation 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 ALSOlvm.conf(5)vgchange(8)lvchange(8)lvmetad(8)pvscan(8)udev(7) sys‐
temd(1)systemd.target(5)systemd.special(7)Red Hat, Inc LVM TOOLS 2.02.176(2) (2017-LVM2-ACTIVATION-GENERATOR(8)
