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The Channel Resource Usage Detail report produces a composite of performance and resource data for each RMF interval for each selected FICON channel. This report would be produced and typically used to identify problem periods for a channel deemed to be performing poorly.
CA MICS Performance Manager FICON Channel Performance Analysis Channel Resource Usage Detail Report For Monday, August 30, yyyy Ending Date: 20JULyyyy CEC Serial: 0851 LCSS: 0 CHPID: 42 Description: FICON Switched DCM in Use: Y CHPID Group: 2 Shared: Y Device Usage: DASD CTC Interval BUS BUS Total CHPID CHPID Bytes Read Bytes Write Average Average Est. End Usage Util Work CHPID I/O I/Os Read Path Written Path Burst Service Open Est. Time Count Pct Units % Busy Count p/sec p/sec % Busy p/sec % Busy Size Time (ms) Exchngs Credits 10:00:00 6.7M 11.57 19.2M 16.40 413,577 459 3.3M 2.83 3.7M 3.10 15K 2.05 0.87 7 10:15:00 8.1M 14.08 30.8M 26.48 699,250 780 2.8M 2.38 3.3M 2.80 7K 1.87 1.34 5 10:30:00 9.6M 16.61 37.5M 31.93 426,576 473 2.9M 2.47 3.3M 2.82 13K 2.50 1.11 8 10:45:00 9.8M 16.97 40.5M 34.60 535,592 595 3.7M 3.12 2.9M 2.42 11K 2.28 1.26 8 11:00:00 10.4M 17.85 43.6M 37.13 503,964 559 4.5M 3.77 2.1M 1.76 11K 2.19 1.14 7 11:15:00 9.8M 16.86 39.5M 33.74 431,397 479 3.7M 3.12 2.3M 1.93 12K 2.61 1.18 8 11:30:00 10.1M 17.56 41.3M 35.35 471,276 525 3.9M 3.29 3.3M 2.77 13K 2.92 1.45 10 11:45:00 9.5M 16.34 38.8M 33.15 523,432 582 2.8M 2.34 3.2M 2.74 10K 2.40 1.31 8 14:15:00 6.7M 11.56 22.1M 18.89 690,749 767 4.5M 3.76 4.8M 4.05 12K 1.12 0.74 4 14:30:00 6.1M 10.52 18.5M 15.81 514,899 571 4.4M 3.70 3.8M 3.21 14K 0.79 0.37 3 14:45:00 6.4M 11.15 20.6M 17.73 531,494 593 4.6M 3.90 4.4M 3.73 15K 0.89 0.44 4 15:00:00 5.8M 10.12 19.3M 16.44 548,833 608 3.7M 3.12 3.4M 2.85 11K 0.66 0.32 2 15:15:00 5.3M 9.19 15.0M 12.88 409,228 455 2.4M 2.01 2.4M 2.02 10K 0.80 0.30 2 15:30:00 5.1M 8.86 12.7M 10.86 332,739 369 2.1M 1.81 2.0M 1.73 11K 0.79 0.24 1 15:45:00 6.2M 10.71 19.4M 16.60 532,462 592 4.3M 3.60 3.7M 3.10 13K 0.96 0.48 3 2-86E Channel Resource Usage Detail Report
Figure 2-86E shows an example of the Channel Resource Usage
Detail report created by the FICON Channel Performance
Analysis query. This report is a listing of channel activity
for the selected time periods by measurement interval, and
can be used to review channel performance at a detail level
and to set performance objectives for future measurement
efforts. A separate report is produced for each channel
selected, and multiple days of input data generate a separate
group of reports for each day. 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) is
used to differentiate the channels and correctly generate
multiple reports.
The following fields are displayed in Figure 2-86E:
Ending The date of the measurement period, derived from
Date the ENDTS element. A separate group of reports
is created for each day of input data.
Duration The total time covered within this reporting
period.
CEC Serial The low-order four bytes of the PRSMCEC data
element. This identifies a particular processor
complex whose channel data is being analyzed.
LCSS The Logical Channel Subsystem ID. This is a one
byte field, with a range of values from 0-3, and
represents a logical grouping of 256 channels.
This field is also refered to as the CSSID
(Channel Subsystem ID).
CHPID The identifier of the channel being reported, as
a two-byte hexadecimal value, with a range of
00-FF.
Description The description of the channel from the CHANDSCR
element. This helps you understand the usage of
the channel being reported.
DCM in Use This field indicates whether Dynamic Channel
Management is enabled (Y) or not (N).
CHPID Group The group characteristics of the channel being
reported. This value is derived from data
element PCAGEN (Channel Path Type Generation)
and can be used to better understand the
operating parameters of the channel. For
example, in our sample report the CHPID Group
value of 2 indicates that this channel is a
FICON Express channel operating at 2GB per
second.
Shared This field indicates whether the channel is
being shared among LPARs (Y) or not (N).
Channel This field explains the usage of active devices
Usage assigned to this channel. Possible values are:
DASD, TAPE, CTC, COMM and OTHER. Since FICON
channels may be assigned to devices with
different characteristics and this can impact
channel measurement values, it is important to
know the exact usage of the channel.
Interval The time of the measurement period, derived from
End Time the ENDTS element. A separate line on the
report is be created for each measurement
interval of input data.
BUS Usage The number of usage cycles used by the hardware
Count PCI BUS to poll for work and transfer data.
This information is obtained from the data
element PCATOTBC (Total Bus Cycles Count).
BUS Util. The utilization of the hardware PCI BUS,
Pct expressed as a percentage. Because the BUS is
always busy polling for new work, this value can
range from 5 to 12 percent even when no actual
work is being performed and no data is being
transferred. This field is found in data
element PCAPCBUS (Pct Channel Busy - Total) and
recomputed by the application as required.
Total Work The number of processor cycles used for the
Units transfer of frames. Each frame is 2112 bytes in
length, with a 64 byte header and 2048 bytes
containing either the channel program or data.
This field is obtained from data element
PCATOTUC (Channel Work Unit Count - Total).
CHPID The percent of (processor) time that the channel
% Busy is actively transferring commands and data, and
based on the Total Work Units field described in
Figure 2-86E. This field is found in data
element PCAPCBSY (Pct Channel Busy - Total) and
recomputed by the application as required.
CHPID I/O The total number of I/O operations executed by
count the channel during the measurement interval.
This is derived as the sum of I/O operations
(SSCH) for all active devices attached to the
channel.
CHPID I/Os The number of I/O operations executed by the
p/sec channel, per second. This is derived as the sum
of I/O operations (SSCH) for all active devices
attached to the channel, divided by the
measurement interval time.
Note: All data rates presented use an internal SAS
format that will display the value in units of K
(1,000), M (1,000,000) or G (1,000,000,000)
bytes.
Bytes Read The total number of bytes read by the channel,
p/Sec per second. This field is a function of data
elements PCATOTRU (Read Data Unit Count -
Total), PCADUS (Data Unit Size) and the
measurement interval.
Read Path The portion of channel busy used for read
% Busy operations, expressed as a percentage of the
maximum amount of data that can be read
concurrently by the channel.
Bytes The total number of bytes written by the
Written channel, per second. This field is a function
p/Sec of data elements PCATOTWU (Write Data Unit Count
- Total), PCADUS (Data Unit Size) and the
measurement interval.
Write Path The portion of channel busy used for write
% Busy operations, expressed as a percentage of the
maximum amount of data that can be written
concurrently, by the channel.
Note: FICON channels have separate paths used for
reading and writing operations, and perform both
operations concurrently and continually.
Because of this feature, this query computes
usage values for each of the paths
independently. Each path must be considered a
separate entity for performance and capacity
planning purposes.
Average The Average Burst Size is the amount of data (in
Burst bytes) transferred during I/O operations, on
Size average. It is computed as the sum of Total
Bytes Read and Total Bytes Written, divided by
the total number of I/O operations (SSCH) for
all active devices attached to the channel.
Average The Average Service Time is the amount of time
Service used for I/O operations, on average. This is
Time (ms) 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).
Est. The Estimated Open Exchanges represent an
Open effective MPL (multi-programming level) for the
Exchngs channel and are the number of I/O operations
active concurrently, on average. This estimated
value is computed as the sum of DVACNN (Device
Connect Time), DVADIS (Device Disconnect Time)
and DVACMRTM (Command Response Time) for all
active devices attached to the channel, divided
by the measurement interval. The device Command
Response Time (CMR) represents, for an I/O
request, the time when the first command in the
channel program is sent to the device, until the
device indicates it has accepted the command,
and is a subset of DVAPEN (Device Pending Time).
FICON channel architecture currently permits a
maximum of 32 Open Exchanges to be used
concurrently. A typical value for most
applications is from 2 through 5, although
higher values have been observed during
benchmarks.
Est. 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. Currently, FICON architecture
allows for a maximum of either 60 or 120 credits
to be used, depending on the model of channel.
This number is a maximum value for the channel
itself; FICON directors contain credits as well.
If fewer credits are available within the FICON
director, then the maximum number the of credits
available will be reduced during protocol
negotiation that follows.
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