Github user resmo commented on the pull request: https://github.com/apache/cloudstack/pull/829#issuecomment-142906721 This is perfectly clear to me. The problem is we are relaying on the `update_time` (not to mix up with `power_state_update_time`). ~~~ *************************** 1. row *************************** instance_name: r-2978-VM type: DomainRouter update_time: 2015-08-24 21:54:42 power_state_update_time: 2015-09-09 08:30:42 power_state_update_count: 3 1 row in set (0.00 sec) ~~~ here ~~~java // 2 times of sync-update interval for graceful period long milliSecondsGracefullPeriod = PingInterval.value() * 2000L; for (VMInstanceVO instance : vmsThatAreMissingReport) { Date vmStateUpdateTime = instance.getUpdateTime(); //... long milliSecondsSinceLastStateUpdate = currentTime.getTime() - vmStateUpdateTime.getTime(); if (milliSecondsSinceLastStateUpdate > milliSecondsGracefullPeriod) { ~~~ so this calculation would do this: ~~~ milliSecondsSinceLastStateUpdate = currentTime.getTime() - vmStateUpdateTime.getTime() 2015-09-24 13:46:48 - 2015-08-24 21:54:42 ~= 1 month if (1 month > 2 minutes grace period) ~~~ still the opinion, increasing grace period would help?
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