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The Channel Resource Summary Usage report is used to summarize all performance and resource measurements for each selected channel across the specified time intervals, and to demonstrate the contribution of each LPAR to the overall channel workload. This format allows you to understand the overall performance of each channel and how each LPAR affects the channel performance. A typical use is to identify one or more peak times using the Channel Service Time graphs and execute this report, selecting those time intervals as a follow up process.
CA MICS Performance Manager 1 FICON Channel Performance Analysis Channel Resource Usage Summary Report, by SYSID For Monday, August 30, yyyy Ending Date: 20JULyyyy Duration: 3:45:02 CEC Serial: 0851 LCSS: 0 CHPID: 42 Description: FICON Switched DCM in Use: Y CHPID Group: 2 Shared: Y Channel Usage: DASD CTC BUS Usage Count: 116.2M BUS Util. Pct : 13.33 Total Work Units : 419.5M CHPID Pct Busy : 23.87 CHPID I/Os p/sec : 560 Bytes Read p/Sec: 3.6M Read Path % Busy : 3.01 Bytes Writn p/Sec: 3.2M Write Path % Busy: 2.74 Avg Burst Size: 12.3K Avg Svc Time (ms): 1.64 Est. Open Exchngs: 0.84 Estimated Credits: 6 LPAR Usage Stats: Total Bytes Read Total Bytes Write Total Avg Average Avg Work CHPID Bytes Read Path Bytes Written Path I/O I/Os Burst Svc Time Open Estimd. SYSID Units % Busy Read p/sec % Busy Written p/sec % Busy Count p/sec Size (ms) Xchngs Credits CA11 15M 0.85 2G 158.8K 0.13 2G 200.1K 0.17 234K 17 20.6K 3.05 0.05 1 CA31 88M 5.05 20G 1.5M 1.26 19G 1.4M 1.23 3M 259 11.4K 0.58 0.12 1 CA71 13M 0.77 1G 94.9K 0.08 1G 134.7K 0.11 322K 23 9.6K 2.52 0.06 0 XAD1 248M 14.11 14G 1.0M 0.90 10G 795.0K 0.66 2M 162 11.5K 3.25 0.50 3 XAE1 6M 0.38 1G 89.1K 0.07 1G 125.7K 0.10 129K 9 22.4K 2.47 0.02 0 XAT1 1M 0.06 91M 6.7K 0.01 1M 85 0.00 22K 1 4.1K 2.62 0.00 0 XA55 922K 0.05 149M 11.0K 0.01 360K 26 0.00 36K 2 4.0K 1.88 0.00 0 XE21 5M 0.32 1G 110.1K 0.09 1G 104.8K 0.09 308K 22 9.4K 0.69 0.01 0 XE44 9M 0.56 2G 197.8K 0.16 1G 108.3K 0.09 181K 13 22.8K 4.45 0.06 1 XE61 14M 0.81 4G 311.7K 0.26 4G 327.9K 0.27 626K 46 13.7K 0.41 0.01 0 2-86D Channel Resource Usage Summary report
Figure 2-86D shows an example of the Channel Resource Usage
Summary report created by the FICON Channel Performance
Analysis query. This report is a summary of channel activity
for the selected time periods and can be used to review
channel performance at a high-level and to set performance
objectives for future measurement efforts. A separate report
will be produced for each channel selected, and multiple days
of input data will 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) will be used to
differentiate the channels and will correctly generate
multiple reports.
The following fields are displayed in Figure 2-86D.
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 referred 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 to better 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.
BUS Usage The number of usage cycles used by the PCI BUS
Count 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 PCI BUS, expressed as a
Pct. 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 Pct. The percent of (processor) time that the channel
Busy is actively transferring commands and data, and
is based on the Total Work Units field described
above. This field is found in data element
PCAPCBSY (Pct Channel Busy - Total) and
recomputed by the application as required.
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 via the channel,
p/Sec per second, formatted and displayed as noted
above. 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 Writn The total number of bytes written by the
p/Sec channel, per second, formatted and displayed as
noted above. This field is a function 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.
Avg Burst The Average Burst Size is the amount of data (in
Size bytes) transferred during I/O operations, on
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.
Avg Svc The Average Service Time is the amount of time
Time (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).
Est. Open The Estimated Open Exchanges represent an
Exchngs effective MPL (multi-programming level) for the
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) time 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.
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. 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 of
credits available will be reduced during the
protocol negotiation that follows.
LPAR Usage Stats
SYSID The CA MICS SYSID value for the reporting LPAR.
Work Units The number of processor cycles used for the
transfer of frames for this LPAR, displayed
using the format discussed above.
CHPID % The percent of (processor) time that the channel
Busy is actively transferring commands and data.
This is based on the Work Units field described
above. This field is found in data element
PCAPCPBY (Pct Channel Busy - LPAR) and
recomputed by the query as required.
Total Bytes The total number of bytes read by the channel,
Read from this LPAR, formatted and displayed as noted
above. This field is derived from data element
PCATOPRU (Read Data Unit Count - LPAR).
Bytes Read The total number of bytes read by the channel,
p/Sec per second, from this LPAR, formatted and
displayed as noted above.
Read Path The portion of channel busy used for read
% Busy operations, from this LPAR, expressed as a
percentage of the maximum amount of data that
can be read concurrently.
Total Bytes The total number of bytes written by the
Written channel, from this LPAR, formatted and displayed
as noted above. This field is derived from data
element PCATOPWU (Write Data Byte Count - LPAR).
Bytes Writn The total number of bytes written by the
p/Sec channel, per second, from this LPAR, formatted
and displayed as noted above.
Write Path The portion of channel busy used for write
% Busy operations, from this LPAR, expressed as a
percentage of the maximum amount of data that
can be written concurrently.
Total I/O The sum of I/O operations (SSCH) of all active
Count devices attached to this channel for this LPAR.
I/Os The number of I/O operations, per second
p/sec performed by the channel on behalf of devices
used by this LPAR. The value is computed the
same as the CHPID I/Os p/sec field above.
Avg Burst The Average Burst Size is the amount of data
Size transferred during I/O operations, on average,
for devices used by this LPAR. The value is
computed the same as the Avg Burst Size field
above.
Avg Svc The Average Service Time is the amount of time
Time (ms) used for I/O operations, on average, for devices
used by this LPAR. This value is computed the
same as the Avg Svc Time (ms) field above.
Avg Open The number of Estimated Open Exchanges in use
Xchngs for I/O operations performed on behalf of this
LPAR. This value is computed in same the manner
as the Est. Open Exchngs field above.
Estimd. The estimated number of credits in use for I/O
Credits operations performed on behalf of this LPAR.
This value is computed in the same manner as the
Estimated Credits field above.
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