ReadyNAS Power Management

Hi StephenB.

I hope this is not opposition. Just discussion. :-)

Thanks for the link. It is interesting for me. I see the NUT is the part of OS6. Agree "Auto" value can be processed more complex way in NUT package. We discuss UPS for home usage (not for data center). NUT package is working on server (NAS) side.  Home UPS just send percentage of battery power and is not aware of events generated by NUT. Main goal of NUT is to send events to slave servers in local net to shutdown them. Generate events for own shutdown does not make a sense. Lifecycle of UPS battery is reduced quickly with deep discharging of battery. Home NAS is not production system. For home usage I would prefer start shutdown as soon as possible if power out. And this is why I don't use "Auto" parameter. My second UPS is simple and haven't got USB interface. Instead of threshold and NUT functionality I use script in autostart (/etc/init.d)

It check eth0 every 20 sec. If router/commutator is out of power for 40 sec then start shutdown.

More cheaper - much better.

pseudo_ups.sh

#!/bin/bash

###################################################
#### --add script from /etc/init.d to autostart
# update-rc.d check_pseudo_UPS defaults
# --or
# insserv check_pseudo_UPS

# --start service
# /etc/init.d/check_pseudo_UPS start
# /etc/init.d/check_pseudo_UPS restart

# --stop service
# /etc/init.d/check_pseudo_UPS stop

# --check log file
# ln  --target-directory=/root -s /var/log/check_pseudo_UPS.log

#check service status
#systemctl status check_pseudo_UPS
###################################################

CHECK_INTERVAL=20                     #time interval in seconds between interface state check
TRIGGER_INTERVALS_COUNT=2    #'not running'-s between 1st detect and shutdown
IFNAME=eth0                               

echo "---------------------------------------"ifconfig
echo -n "Power up: "
date
echo $?
DOWN_COUNT=0

while true
do

ifconfig $IFNAME | grep -q RUNNING
if [ $? -eq 0 ]; then
    if [ $DOWN_COUNT -ne 0 ]; then
        DOWN_COUNT=0
        echo -n "Interface $IFNAME again running: "
        date
    fi
else
    ((DOWN_COUNT++))
    if [ $DOWN_COUNT -eq 1 ]; then
        echo -n "Interface $IFNAME not running: "
        date
    fi

    if [ $DOWN_COUNT -gt $TRIGGER_INTERVALS_COUNT ]; then
        echo -n "Shutting down: "
        date
        sync
        rn_shutdown
#      /frontview/bin/autopoweroff &> /dev/null
#       shutdown -h now
        exit 0
    fi
fi

sleep $CHECK_INTERVAL
done