Measurement threshold policies provide the ability to perform
actions at different times, depending on how long the threshold is
crossed. You can specify Start actions, Continue
actions, and End actions.
Start actions are carried out the first time that the
threshold is crossed.
Continue actions are carried out at each subsequent
polling interval if the reset value is not
reached.
End actions are carried out after the threshold crosses
the reset value.
If two or more rules in a policy
measure the same performance value but with different thresholds,
then the following rules determine which actions are carried out:
The actions of only one rule will be
carried out per polling interval.
Start actions are carried out the first time that the
value exceeds a threshold at a polling interval. (If the value
exceeds the threshold of several rules, the actions of the rule
with the most severe value are carried out.)
Continue actions are carried out at each subsequent
polling interval if the reset value is not
reached, but only if the start actions for that rule were carried
out.
End actions are carried out after the threshold crosses
the reset value, only if the start actions for that rule were
carried out. If the value drops below two thresholds within one
polling interval, the end actions of the lowest rule that performed
start actions are carried out.