[Nut-upsuser] MGE Ellipse 800 USBS & FreeBSD
francois at 4umusic.com
Wed Aug 24 08:38:37 UTC 2005
Hello happy nuters,
Some complementary words about making nut 2.02 successfully run on
FreeBSD with MGE Ellipse.
With the usefull information Arnaud sent, it's rather obvious that
the erratic response of the ups to the shutdown script is linked to
its difficulty to handle large traffic on the serial line.
These are the final tweak I made to have this configuration
satisfyingly operational. As I said in a former post, it might seem
sometime a little rude, but it's a way to work around the serial link
struggle which sometime might happen either at startup or shutdown,
leading the mge-shut driver not to work properly.
As far I tested, it seems to work fine for my configuration but I
strongly recommend you to do extensive testing of your system before
considering it operational. Just in case you need some more tweaking...
1./ The start/stop script :
## /usr/local/etc/rc.d/nut.sh : start/stop nut (ups management)
case "$1" in
echo "Starting and checking (5 times) for nut driver mge-shut"
chmod 0600 /dev/cuaa0
chown nut:nut /dev/cuaa0
until [ $COUNTER -le 0 ]; do
echo "attempt to start driver mge-shut"
echo "testing for success"
if (test -f /var/state/ups/mge-shut-cuaa0.pid)
echo "Starting nut daemon upsd"
/usr/local/ups/sbin/upsd -u nut
echo "Starting nut monitor upsmon"
echo "Stopping nut monitor upsmon"
kill -9 `cat /var/run/upsmon.pid`> /dev/null
echo "Stopping nut daemon upsd"
kill -9 `cat /var/state/ups/upsd.pid`> /dev/null
echo "Stopping nut driver mge-shut"
killall -9 mge-shut
echo "Usage: /usr/local/etc/rc.d/$NAME.sh start|stop" >&2
2./ These are the additions to the /etc/rc.shutdown file (@ the end
of the file)
# Insert other shutdown procedures here
# shutdown ups with upsdrvctl
if (test -f /etc/killpower)
echo "Killing the power, bye !"
# insuring no mge-shut driver is running and cleaning pid files
killall -9 mge-shut
# a rather large sleep to insure the ups stop babbling
# shutting down the ups
# sleep 120
# The shutdown -p failed
# you need to reboot
3./ the SHUTDOWNCMD
Please notice that most of the recent hardware might use the "-p"
option for the shutdown command. This will automatically switch of
the FreeBSD computer after halted. This will save battery and so
makes the recharging process shorter. So this is the way the shutdown
command looks like in the ups.conf :
SHUTDOWNCMD "/sbin/shutdown -p now"
4./ More info on FreeBSD shutdown process
About the shutdown in FreeBSD please read this I quote from another
ups related site :
"On the FreeBSD OS, there is no known way for a user program to get
control when all the disks are synced. This is needed for apcupsd to
be able to issue the killpower command to the UPS so that the UPS
shuts off the power. To accomplish the same thing on FreeBSD systems,
make sure you have a SmartUPS and that your UPS shutdown grace period
is set sufficiently long so that you system will power down (usually
To work around this problem this is how my ups.conf contains :
user = nut
driverpath = /usr/local/ups/bin
pollinterval = 15
driver = mge-shut
port = /dev/cuaa0
desc = "MGE Ellipse 800 powering myserver"
offdelay = 60
ondelay = 9
notification = 3
The offdelay is set to 60 seconds which is enough in my case to do
the disks syncing and halt processes.
The pollinterval is increased to limit the traffic on the serial line.
5./ Be warned that the "battery.charge: XX" reported by the ups after
a powerfail and a ups shutdown is probably totally wrong because of
the Ellipse design. Don't try to unplug the ups immediately or you
may face an out of battery shut off and some serious filesystem
Please read the info Arnaud sent about this in the [Nut-upsuser] Re:
followup : MGE Ellipse 800 USBS doesn't shutdown under FreeBSD post.
That's all for today, I hope this might help.
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