Explanation: TRACKMANAGEDTHRESHOLD is an optional parameter, only valid with the PRIMARY keyword, specifying the required high and low threshold for the track-managed space of a non-SMS level-0 extended address volume (EAV).
TRACKMANAGEDTHRESHOLD is used to ensure that enough free space is maintained in the track-managed space of a volume separate from the free space on the entire volume. This is done to ensure that the track-managed space of an EAV has enough free space for data sets to be allocated on it. Even if a volume's low THRESHOLD has been met, space management will continue for data sets that reside in the track-managed space if the low TRACKMANAGEDTHRESHOLD has not been met.
If TRACKMANAGEDTHRESHOLD is not specified, then the corresponding values for THRESHOLD will be used. If no threshold values are specified, then all threshold values will use the default values. If TRACKMANAGEDTHRESHOLD is specified, then both high and low are required subparameters. If only one value is specified for TRACKMANAGEDTHRESHOLD, then the command will fail.
The following table indicates the threshold values as they apply to each volume type:
| Primary Volume Type | Threshold Values |
|---|---|
| EAV volume | Both high and low thresholds apply.
If the first limit (high threshold) is specified as 100 or if it is not greater than the second limit (low threshold), or if the low threshold is equal to zero, no thresholds are defined for the volume. |
| Non-EAV volume | If you specify the TRACKMANAGEDTHRESHOLD parameter for a non-EAV volume, the ADDVOL command will fail. |