The ASDU (ASD Usage) command indicates, for a given job or task, the number of actual segment descriptors (ASDs) currently in use and the maximum number of ASDs used by the job or task since it began.
Syntax

Explanation
For every job or task in the specified mix number list, the <mix number list> ASDU command displays the number of ASDs currently in use and the maximum number of ASDs used since the job or task began.
Example
31872, 31875, 31877 ASDU ASD USAGE BY TASK 31872 ASD USAGE: CURRENTLY IN-USE : 69 ASDS MAXIMUM IN-USE : 90 ASDS 31875 ASD USAGE: CURRENTLY IN-USE : 80 ASDS MAXIMUM IN-USE : 169 ASDS 31877 ASD USAGE: CURRENTLY IN-USE : 5,522 ASDS MAXIMUM IN-USE : 7,079 ASDS