The following script will remove all alarms on al visible entities

$alarmManager = Get-View AlarmManager
$alarms = $alarmManager.GetAlarm($null)
$alarms | %{
	$alarm = Get-View $_
	$alarm.RemoveAlarm()
}

Note that this not remove the alarms on hidden entities like vm, host and datacenters.

And please test in a non-production environment first !

There is no way to get a deleted alarm back.

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Blog: LucD notes

Twitter: lucd22