timing of *.service start-up

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Using systemd-185 (kmod 8, kernel 3.3.7) I'm noticing that a few of my services are failing (sometimes, not perfectly predictably) at boot time. When the failures occur, a manual invocation of "systemctl restart <whatever>" always works fine to get the services going. So it seems there are some timing/race problems and I'd much appreciate any help with diagnosing them.

Take thinkfan for example. My unit
/etc/systemd/system/thinkfan.service looks like this:

[Unit]
Description=Thinkfan fan controller

[Service]
ExecStart=/usr/sbin/thinkfan -q -n -z

[Install]
WantedBy=multi-user.target

Sometimes thinkfan starts fine, but other times I'm seeing this sort of thing (extracted via journalctl):

systemd[1]: systemd 185 running in system mode.
udevd[60]: starting version 185
thinkfan[153]: thinkfan 0.7.3 starting...
thinkfan[153]: /sys/class/hwmon/hwmon2/device/pwm1_enable: \
 No such file or directory
systemd[1]: thinkfan.service: main process exited, \
 code=exited, status=254
systemd[1]: Unit thinkfan.service entered failed state.

--
Allin Cottrell
Department of Economics
Wake Forest University, NC

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