Red Hat Bugzilla – Bug 70027
initscripts fail to switch off raid devices when ups power fails
Last modified: 2014-03-16 22:29:23 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.1b) Gecko/20020722
Description of problem:
If a ups is being monitored by nut (network ups tools, included with RH) to
watch for powerouts, and if the root device is on a raid device (not tested if
it isn't but I think this is true if _any_ device is on raid), then the
shutdown script fails to switch off the raid device on a powerfail shutdown.
This means the raid array has to resync when the power returns (defeating the
whole point of the ups).
if [ "$command" = halt ] ; then
if [ -r /etc/ups/upsmon.conf -a -f /etc/killpower -a -f /etc/sysconfig/ups ]
[ "$SERVER" = "yes" -a "$MODEL" != "NONE" -a -n "$MODEL" -a -n "$DEVICE"
] && $MODEL -k $DEVICE
This means it calls the upsdriver with -k, killing off the power. Because the
kernel never gets to a "Power down" state, the raid array is still active. This
means it needs to get synced on reboot.
As a workaround, I could get rid of the $MODEL -k $DEVICE command and just let
the power run out. Is there some way to force the raid device to switch off
before the $MODEL -k $DEVICE command?
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Construct root on raid 1 device
2. Set up NUT to monitor UPS
3. Disconnect UPS
4. Wait for switch off
5. Turn power on
Actual Results: Raid device starts resync (see /proc/mdstat)
Expected Results: Raid device should cleanly switch off.
Doing some debugging it seems the nut command:
$MODEL -k $DEVICE
command tells the UPS to switch the power off and then waits for 90s in a sleep,
hoping the power will go off! This means the kernel halt never happens. If you
adjust the "grace period" of the UPS to shut down to greater than 90s (3 mins on
our APC ups), then the nut command completes (the sleep times out), and the
kernel actually shuts down, halting the raid devices.
I assume the 90s wait is so the kernel never shuts down and so when the power
comes back an ATX motherboard will come back up (rather than sitting in a shut
Closing bugs on older, no longer supported, releases. Apologies for any lack of
If this persists on a current release, such as Fedora Core 4, please open a new bug.