Configuring hysteresis in an alarm template

Two types of hysteresis are available, clear hysteresis and alarm hysteresis, respectively having an effect on the clearing and on the triggering of alarms:

• Enter a value in the Hyst off column to determine the number of seconds before the severity level of an alarm decreases.

• Enter a value in the Hyst on column to determine the number of seconds before the severity level of an alarm increases.

• If you want to apply hysteresis to specific severity levels only, when you enter a value in the Hyst off or Hyst on box, select the severity levels in the drop-down list below the box.

Note

• For most parameters, the hysteresis interval has to be higher than the polling interval. For example, if a parameter is only polled every 10 seconds, you should not configure a hysteresis interval of 5 seconds. However, an exception to this are parameters updated via traps or via a smart-serial connection.
• For parameters of type string, hysteresis should only be applied to "high" severity levels (e.g. Warning High, Major High), not to "low" severity levels. From DataMiner 10.1.9/10.2.0 onwards, applying hysteresis to "low" severity levels is no longer possible for string parameters.

Tip

See also: Alarm templates – Hysteresis on DataMiner Dojo