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This report, which is similar to report ERXT0349/EZXT0349, summarizes statistics for DCM channels only. It is broken down by the LCUs that had the channels assigned. The data is summarized over all the intervals in the input data, EXTDATA type R78B.
Dynamic channel path management (DCM) allows z/OS to dynamically change channel path definitions to ESCON director-attached DASD control units in response to changing workloads. DCM moves channel resources to the control units where they are required. Excessive Control Unit Busy or Command Response delays suggest a configuration imbalance that DCM is unable to compensate.
The fields in the report are as follows:
Logical control unit identifier.
Minimum and maximum number of DCM managed channel paths used for this LCU during the interval.
Site-defined number of DCM-managed channel paths for use by this LCU.
Average rate of I/O requests going through the DCM managed channel paths for this LCU.
Average percentage of requests deferred due to the director port and control unit being busy.
Average delay (in miliseconds) caused by the control unit being busy.
Average initial command-response-time delay (in milliseconds) between the first I/O function started and the first response from the device.
1 2/20/08 I/O QUEUING - DCM CHANNELS SUMMARY REPORT PAGE 2 REPORT ID: EZXT0354 SYSPLEX: UTCPLXJ8 SOURCE : SMF 78-3 SYSTEM: J80 FROM DATE: 06/07/24 FROM TIME: 11:30:00 TO DATE: 06/07/24 TO TIME: 12:00:00 - LCU DCM DCM DCM CHAN PATH PCT PD PCT CU AVG CUB AVG CMR ID MIN MAX DEF TAKEN BUSY BUSY DELAY DELAY 00027 3 3 3 32.241 .44 .00 .00 .00 0044 3 3 3 .978 .00 .00 .00 .00 0046 1 .000 .00 .00 .00 .00 0048 1 1 1 .006 .00 .00 .00 .00 004A 1 1 1 .081 .00 .00 .00 .00 004C 1 .000 .00 .00 .00 .00 3 1 33.307 .43 .00 .00 .00
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