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make sure sync cannot block reboot

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The recent discussed improvement has the risk that if 'sync' hangs, the reboot may be delayed in the same way as the 'reboot' command would do. To work around, we're adding a 5 second timeout. If it cannot sync in 5 seconds, it will not succeed anyway and we should proceed the reset.

@snuf: Could we use your OVM3 heartbeat script for other hypervisors as well? One way to do it seems like a nice idea :-)
This commit is contained in:
Remi Bergsma 2015-04-09 12:18:21 +02:00
parent 770297e8cb
commit 7bce656b40
1 changed files with 2 additions and 1 deletions
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3
scripts/vm/hypervisor/kvm/kvmheartbeat.sh
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@ -156,7 +156,8 @@ then
elif [ "$cflag" == "1" ] elif [ "$cflag" == "1" ]
then then
/usr/bin/logger -t heartbeat "kvmheartbeat.sh rebooted system because it was unable to write the heartbeat to the storage." /usr/bin/logger -t heartbeat "kvmheartbeat.sh rebooted system because it was unable to write the heartbeat to the storage."
sync sync &
sleep 5
echo b > /proc/sysrq-trigger echo b > /proc/sysrq-trigger
exit $? exit $?
else else