The VMCCHA query provides a tabular report and several charts showing Central Processing Complex (CPC) level physical channel utilization. Three separate data extracts show physical channel utilization:
In addition, the query produces a SASLIST daily report showing utilization for each physical channel. The charts and reports are produced by VM SYSID, but each SYSID shows the exact same utilization numbers. This is because the data reported is for overall CPC level utilization. As mentioned in Query Modifications, you can filter the data to select a single VM SYSID to cut down on redundant charts.
Channel utilization is shown using percent busy ranges, 0-10 percent, 11-20 percent, 21-30 percent utilization, and so on. As an illustration, for a given channel ‘X’, you see that the channel ‘X’ was 0-10 percent busy 12 percent of the day, 11-20 percent busy 18 percent of the day, and so forth.
The top example shows the 3D chart. The channel addresses run along the X-axis, from left to right. Channel 40 was 41-50 percent busy (lilac bar) 6 percent of the day.
The next example shows the detail level chart, where a separate daily chart is produced for each physical channel address. The example shows that channel "2B" was 21-30 percent busy, 42 percent of the day, and it was 41-50 percent busy 4 percent of the day.
The final chart example shows overall daily statistics for FICON channels only. The average percent busy for each channel is shown using a horizontal line. The daily totals for read and write FICON I/O units are shown using stacked vertical bars.
The SASLIST report generates a line for each physical channel, showing the channel type (for example, FICON or ESCON) and the same daily percent utilization metrics displayed with the charts.
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