Fedora 19
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[1] Stop services that are enabled by default if you don't need them. List all systemd services by a command below.
[root@dlp ~]#
systemctl -t service

UNIT                           LOAD   ACTIVE SUB     DESCRIPTION
auditd.service                 loaded active running Security Auditing Service
avahi-daemon.service           loaded active running Avahi mDNS/DNS-SD Stack
chronyd.service                loaded active running NTP client/server
crond.service                  loaded active running Command Scheduler
dbus.service                   loaded active running D-Bus System Message Bus
fedora-readonly.service        loaded active exited  Configure read-only root support
getty@tty1.service             loaded active running Getty on tty1
lvm2-lvmetad.service           loaded active running LVM2 metadata daemon
lvm2-monitor.service           loaded active exited  Monitoring of LVM2 mirrors, snapshots etc.
network.service                loaded active exited  LSB: Bring up/down networking
rsyslog.service                loaded active running System Logging Service
sendmail.service               loaded active running Sendmail Mail Transport Agent
sm-client.service              loaded active running Sendmail Mail Transport Client
sshd.service                   loaded active running OpenSSH server daemon
systemd-journald.service       loaded active running Journal Service
systemd-logind.service         loaded active running Login Service
systemd-remount-fs.service     loaded active exited  Remount Root and Kernel File Systems
systemd-sysctl.service         loaded active exited  Apply Kernel Variables
systemd-tmpfiles-setup.service loaded active exited  Recreate Volatile Files and Directories
systemd-udev-trigger.service   loaded active exited  udev Coldplug all Devices
systemd-udevd.service          loaded active running udev Kernel Device Manager
systemd-user-sessions.service  loaded active exited  Permit User Sessions
systemd-vconsole-setup.service loaded active exited  Setup Virtual Console

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

23 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
[2] Stop a service. The example below means stop 'sendmail' and disable auto-start at booting system.
[root@dlp ~]#
systemctl stop sendmail.service

[root@dlp ~]#
systemctl disable sendmail.service

rm '/etc/systemd/system/multi-user.target.wants/sm-client.service'
rm '/etc/systemd/system/multi-user.target.wants/sendmail.service'
[3] There are some SysV services on Fedora 19. Those are controled by chkconfig like below.
[root@dlp ~]#
chkconfig --list

Note: This output shows SysV services only and does not include native
      systemd services. SysV configuration data might be overridden by native
      systemd configuration.

      If you want to list systemd services use 'systemctl list-unit-files'.
      To see services enabled on particular target use
      'systemctl list-dependencies [target]'.

ebtables        0:off   1:off   2:off   3:off   4:off   5:off   6:off
netconsole      0:off   1:off   2:off   3:off   4:off   5:off   6:off
network         0:off   1:off   2:on    3:on    4:on    5:on    6:off

# unset auto-start setting for a netconsole

[root@dlp ~]#
chkconfig netconsole off