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The Channel Service Time graphs are produced for each selected channel and provide a visual analysis of channel service time versus both Open Exchanges and Credits. This allows you to quickly understand the macro-level performance of each channel and determine if any specific problem areas exist.
CA MICS Performance Manager 1 FICON Channel Performance Analysis Plot of Channel 42 Service Times With Open Exchanges & Credits For Monday, August 30, yyyy ---+-------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--- | | 30 + + | | | | | | S 20 + + e | | r | | v | | i 10 + + c | | e | | | | T 5 +-------------------------------------------------------------------------------------------------------------------------+ i | | m | | e | | 3 + + ( | + | m | + | s | + | ) 2 + + + | + | | | | + | 1 + + + | + + + | | + + | | | 0 + + ---+-------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--- 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 Estimated Open Exchanges 2-86C Plot of Channel Service Times
Figure 2-86C shows an example of the Plot of Channel Service
Times created by the FICON Channel Performance Analysis
query. Two separate plots are created for each channel being
analyzed: one for Open Exchanges and one for Credits. In
large configurations, such as those with more than 256
channels and using more than one Logical Channel Subsystem,
the same channel ID will be used more than once. Therefore,
the LCSS identifier (CCSID) will be used to differentiate the
channels and will correctly generate multiple plots.
The following measurements are shown in Figure 2-86C:
Service The Average Service Time is the amount of time
Times (ms) used for I/O operations, on average. This is
computed as the sum of DVACNN ( Device Connect
Time), DVADIS (Device Disconnect Time) and
DVAPEN (Device pending Time) for all active
devices attached to the channel, divided by the
total I/O count (SSCH).
Estimated The Estimated Open Exchanges represent an
Open effective MPL (multi-programming level) for the
exchanges channel and are the number of I/O operations
active concurrently, on average. A complete
description of this field and its computation is
presented in Section 2.4.8.1.3
Estimated The Estimated Credits are another measure of
Credits channel usage. Credits are an internal hardware
buffer used to house a single frame during I/O
operations. A complete description of this
field and its computation is presented in
Section 2.4.8.1.3
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