Comment # 16 on bug 1011053 from zhen ren

(In reply to Marcus Meissner from comment #15)
> meaning what will happen on systems withiout LVM or similar?

Only harmless influence on lvm and device-mapper RPMs.

> 
> will there be breakage?

No.

> 
> will there be a useless service running?

I enabled 2 systemd units in this MU:

1. dm-event.socket
just socket-based activation, 'dmeventd' will be started on demand;

2. lvm2-monitor.service
This service will default to running. But, I doesn't see any real load except
for a running service. What this service does is just telling 'dmeventd' to
start/stop to perform real monitoring work for certain volume group.

I also take upstream pkg spec file as a reference:
"""
%post
/sbin/ldconfig
%systemd_post blk-availability.service lvm2-monitor.service
if [ "$1" = "1" ] ; then
    # enable and start lvm2-monitor.service on completely new installation
only, not on upgrades
    systemctl enable lvm2-monitor.service
    systemctl start lvm2-monitor.service
fi
"""

So, I think it's safe and deserved to enable them:)