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The VM Channel Path Load Analysis report provides information
about all active channels. Only channels for which "busy"
conditions occur are included. Channel paths provide the
interface that allows for control units and I/O devices to be
physically connected to the I/O subsystem.
INTENDED USE:
The report is designed to help analyze each channel path by
path ID. For each ID, the type of path and the relative
frequency with which the channel busy percentage was found in
either of 10% ranges of 0-10, 11-20,..., 91-100. The report
can help detect bottlenecks in the I/O subsystem caused by
excessive path utilization.
Only FICON and ESCON channels are reported.
FORMAT:
A tabular listing that contains one line of information
for each active channel configured during the reporting
period. Report is ordered by descending %BUSY sequence
(highest to lowest) and CHPID. In addition to the channel
path ID, the following columns are shown on the report:
CHPID - Hexadecimal number of the channel path
identifier.
CHAN-GROUP DESCR - Description of the channel model
group as found in the Store-Channel-Path description.
CHAN-GROUP QUAL - The hexadecimal channel model group
qualifier.
%BUSY CUR - Current percent channel busy calculated
for the last interval of the hour.
%BUSY AVE - Average percent channel busy for the
whole period since the last MONITOR RESET.
For FICON channels, the percent busy is calculated as
the percentage of actual work unit utilization
compared to the maximum possible value.
CHANNEL BUSY & DISTRIBUTION 0-10 thru 91-100 - is the
channel load distribution for each active channel. It
is the relative frequency with which percent channel
busy was found to be in the range.
An example of this report is shown in Figure 3-22.
INQUIRY ID:
VMXLS1
DATA SOURCE (File/Timespan):
VMXCPM01 - DETAIL
DATA ELEMENTS USED:
CHANNEL - Physical Channel Address
CPMTYPE - VM Channel Path Type
CPMCMG - VM Channel Measurement Group
CPMCMMQ - VM Channel Model Group Qualifier
CPMPCPSY - VM Percent Channel Busy - CPC
CALCULATIONS:
For each channel within the hour, PC0_10 thru PC91_100
fields are accumulated to tell how many times Percent
Channel Busy - CPC (CPMPCBSY) fell within the specified
ranges.
IF CPMPCBSY LE nn THEN PCll_hh+1;
where ll = low range percent and hh = high range
percent (e.g. PC11_20)
For the percentage of observations falling into a
particular range of percent values, e.g. 30-39%, (PCTnn)
of total CPMPCBSY during the whole period (time from last
MONITOR RESET to current), the following calculation is
used:
PCTnn=(PCll_hh/TOTSAMP*100)
where PCTnn is the percent range and TOTSAMP is the
accumulated value of INTERVLS for each active channel
within the hour
USAGE CONSIDERATIONS:
None
+----------------------------------------------------------------------------------------------------------------------------------+ | C H A N N E L P A T H L O A D A N A L Y S I S R E P O R T | | Page nnn | | z/VM System ID SYSA Start 20JULyy:23:52:45.92 | | Release V5R4 End 20JULyy:23:59:45.92 | | CPMF: Extended Mode CSSID: 0 | |----------------------------------------------------------------------------------------------------------------------------------| | CHPID Chan-Group <% Busy> <-------------- Channel % Busy Distributon -------> | | (Hex) Descr Qual Cur Ave 0-10 11-20 21-30 31-40 41-50 51-60 61-70 71-80 81-90 91-100 | | 40 FCS 0 36 38 0 0 0 72 28 0 0 0 0 0 | | 27 FCS 0 34 38 0 0 0 72 28 0 0 0 0 0 | | 2B FCS 0 22 24 0 14 86 0 0 0 0 0 0 0 | | 4C FCS 0 22 24 0 14 86 0 0 0 0 0 0 0 | | 31 FCS 0 20 20 0 28 72 0 0 0 0 0 0 0 | | 4F FCS 0 20 20 0 28 72 0 0 0 0 0 0 0 | | 48 FCS 0 14 14 0 100 0 0 0 0 0 0 0 0 | | 41 FCS 0 12 16 0 72 28 0 0 0 0 0 0 0 | | 43 FCS 0 12 14 0 100 0 0 0 0 0 0 0 0 | | 2D FCS 0 10 6 100 0 0 0 0 0 0 0 0 0 | | 21 FCS 0 10 8 86 14 0 0 0 0 0 0 0 0 | | 22 FCS 0 10 8 86 14 0 0 0 0 0 0 0 0 | | 23 FCS 0 10 8 86 14 0 0 0 0 0 0 0 0 | | 24 FCS 0 10 8 86 14 0 0 0 0 0 0 0 0 | | 29 FCS 0 10 6 100 0 0 0 0 0 0 0 0 0 | | 4A FCS 0 10 6 100 0 0 0 0 0 0 0 0 0 | | 4E FCS 0 10 6 100 0 0 0 0 0 0 0 0 0 | | 51 FCS 0 8 4 100 0 0 0 0 0 0 0 0 0 | | 53 FCS 0 8 4 100 0 0 0 0 0 0 0 0 0 | | 20 FCS 0 6 12 28 72 0 0 0 0 0 0 0 0 | | 4B FCS 0 4 4 100 0 0 0 0 0 0 0 0 0 | | 4D FCS 0 4 4 100 0 0 0 0 0 0 0 0 0 | | 42 FCS 0 4 4 100 0 0 0 0 0 0 0 0 0 | | 44 FCS 0 4 4 100 0 0 0 0 0 0 0 0 0 | | 14 OSD 0 2 2 100 0 0 0 0 0 0 0 0 0 | | AA SCHP 0 0 0 100 0 0 0 0 0 0 0 0 0 | | AB SCHP 0 0 0 100 0 0 0 0 0 0 0 0 0 | | AC SCHP 0 0 0 100 0 0 0 0 0 0 0 0 0 | | AD SCHP 0 0 0 100 0 0 0 0 0 0 0 0 0 | | AE SCHP 0 0 0 100 0 0 0 0 0 0 0 0 0 | | AF SCHP 0 0 0 100 0 0 0 0 0 0 0 0 0 | | A0 SCHP 0 0 0 100 0 0 0 0 0 0 0 0 0 | | A1 SCHP 0 0 0 100 0 0 0 0 0 0 0 0 0 | | A2 SCHP 0 0 0 100 0 0 0 0 0 0 0 0 0 | | A3 SCHP 0 0 0 100 0 0 0 0 0 0 0 0 0 |
Figure 3-22. VM Channel Path Load Analysis
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