Overview

This report shows how much DASD or TAPE I/O time was measured for each file that was open during the observation session. The quantification is based on the number of samples activity on the file was observed. This is expressed as a percentage of the total number of samples.

Two types of detail line are shown:
  • DDNAME
  • Cylinder Address (for DASD)

Initially, only the DDNAME lines are visible. You can expand a DDNAME line (using the “+” line command) to reveal its subordinate Cylinder Address lines.

A sample report is shown here, it has been fully expanded:

  File  View  Navigate  Help
--------------------------------------------------------------------------------
D02: DASD Usage Time by DDNAME (0618/TSTJOB01)                Row 00001 of 00006
Command ===> __________________________________________________ Scroll ===> CSR 

DDNAME>Cyl   Volume>Unit        Percent of Time * 10.00%  ±2.2%
                                    *....1....2....3....4....5....6....7....8..
VSAM1-02      BKNSM2           8.90 =====
→ Cyl_00BA         0A93-3390   8.85 =====
→ Cyl_0007         0A93-3390   0.05

INFILE      BKNSM1             1.25 ==
→ Cyl_0086         0A92-3390   1.25 ==
Parent topic: D02 - DASD usage by DDNAME