VM FICON Channel Path Load Analysis
The VM FICON Channel Path Load Analysis report provides information about FICON channels.
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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 FICON channels by path ID. For each ID, percent channel utilization for the partition and total for the system can be analyzed to help detect bottlenecks in the I/O subsystem caused by excessive path utilization.
Format
A tabular listing that contains one line of information for each active channel configured during the reporting period. Report is ordered by channel path ID. In addition to the channel path ID, the following columns are shown on the report:
CHPID
Hexadecimal number of the channel path identifier.
SHRD
Indicator for the channel which can be either YES for channels shared with other logical partitions, or NO for channels dedicated to this logical partition.
FICON CHANNEL UTILIZATION %
The following fields show the relative utilization of resources compared to the maximum value, in percent.
TOTAL FOR SYSTEM:
BUS CYCLE T_BCY
The bus cycles utilization for the whole system.
WORK UNITS T_WUN
The work units utilization for the whole system.
DATA UNITS WRITE T_DUW
The data units write utilization for the whole system.
DATA UNITS READ T_DUR
The data units read utilization for the whole system.
OWN PARTITION:
WORK UNITS L_WUN
The work units utilization for the own logical partition.
DATA UNITS WRITE L_DUW
The data units write utilization for the own logical partition.
DATA UNIT READ L_DUR
The data units read utilization for the own logical partition.
TOTAL DATA TRANSFER RATE (BYTES/S):
WRITES/S
The total number of bytes written per second for the whole system.
READ/S
The total number of bytes read per second for the whole system.
An example of this report is shown in the VM FICON Channel Path Load Analysis figure.
Inquiry ID
- VMXLS2
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
- CPMCBCCT
- - VM Total Bus Cycles Count
- CPMSHRCT
- - VM Channel Path Shared
- CPMCPINT
- - VM Channel Path Interval Time
- CPMCWUT
- - VM FICON Channel Work Unit Count - CPC
- CPMTDUW
- - VM FICON Write Data Unit Count - CPC
- CPMTDUR
- - VM FICON Read Data Unit Count - CPC
- CPMCWUL
- - VM FICON Channel Work Unit Count - LPAR
- CPMLDUW
- - VM FICON Write Data Unit Count - LPAR
- CPMLDUR
- - VM FICON Read Data Unit Count - LPAR
- CPMMXIBC
- - VM Max FICON Internal Bus Cycles Per Second
- CPMMXUNP
- - VM Max FICON Channel Work Units Per Second
- CPMMXUNW
- - VM Max FICON Write Data Units Per Second
- CPMMXUNR
- - VM Max FICON Read Data Units Per Second
- CPMDUS
- - VM FICON Data Unit Size
Calculations
Percent average total internal bus cycle utilization:
T_BCY=(CPMCBCCT*100)/CPMMXIBC/CPMCPINT;
Percent average total channel work units utilization:
T_WUN=(CPMCWUT*100)/CPMMXUNP/CPMCPINT;
Percent average total data unit writes utilization:
T_DUW=(CPMTDUW*100)/CPMMXUNW/CPMCPINT;
Percent average total data unit reads utilization:
T_DUR=(CPMTDUR*100)/CPMMXUNR/CPMCPINT;
Percent average logical channel work unit utilization for the partition:
L_WUN=(CPMCWUL*100)/CPMMXUNP/CPMCPINT;
Percent average logical channel data unit writes utilization for the partition:
L_DUW=(CPMLDUW*100)/CPMMXUNW/CPMCPINT;
Percent average logical channel data unit reads utilization for the partition:
L_DUR=(CPMLDUR*100)/CPMMXUNR/CPMCPINT;
Average total bytes written per second:
WRITES=ROUND((CPMTDUW*CPMDUS)/CPMCPINT);
Average total bytes read per second:
READS=ROUND((CPMTDUR*CPMDUS)/CPMCPINT);
Usage Considerations
None
VM FICON Channel Path Load Analysis Sample
| F I C O N C H A N N E L L O A D A N A L Y S I S R E P O R T | | Page 001 | | z/VM System ID SYSA Start 20JULyy:23:52:45.92 | | Release V5R4 End 20JULyy:23:59:45.92 | | CPMF: Extended Mode CSSID: 0 | |--------------------------------------------------------------------------------------------------------------------| | <------------------ FICON Channel Utilization % -----------------> | | <--------- Total for System ---------> <---- Own Partition -----> <--- Total Data ---> | |Channel Bus Work <- Data Units -> Work <- Data Units -> <-- Transfer Rate --> | |Path Cycle Units Write Read Units Write Read <---- (Bytes/s) ----> | |ID Shared T_Bcy T_WUn T_DUW T_DUR L_WUn L_DUW L_DUR Writes/s Reads/s | |0A YES 0 0 0 0 0 0 0 725 7085 | |0B YES 0 0 0 0 0 0 0 436 0 | |0C YES 0 0 0 0 0 0 0 284 0 | |0D YES 0 0 0 0 0 0 0 0 0 | |00 YES 0 0 0 0 0 0 0 0 1877 | |01 YES 0 0 0 0 0 0 0 52744 11940 | |02 YES 0 0 0 0 0 0 0 7957 10867 | |03 YES 0 0 0 0 0 0 0 0 1877 | |04 YES 0 0 0 0 0 0 0 0 1877 | |05 YES 0 0 0 0 0 0 0 0 0 | |06 YES 0 0 0 0 0 0 0 0 269 | |07 YES 0 0 0 0 0 0 0 0 0 | |08 YES 0 0 0 0 0 0 0 0 269 | |09 YES 0 0 0 0 0 0 0 0 1877 | |10 YES 0 0 0 0 0 0 0 0 1877 | |11 YES 0 0 0 0 0 0 0 0 1877 | |12 YES 0 0 0 0 0 0 0 0 1877 | |13 YES 0 1 0 0 0 0 0 100670 283112 | |14 YES 0 2 0 0 0 0 0 0 1876 | |15 YES 0 0 0 0 0 0 0 0 0 | |16 YES 0 0 0 0 0 0 0 0 0 | |17 YES 0 0 0 0 0 0 0 10 7245 | |18 YES 0 0 0 0 0 0 0 0 0 | |2A YES 0 0 0 0 0 0 0 0 0 | |2B YES 5 23 2 14 1 0 0 3323764 28138817 | |2C YES 0 0 0 0 0 0 0 0 0 | |2D YES 1 7 1 1 1 0 0 1522803 2455957 | |2E YES 0 0 0 0 0 0 0 0 27 | |20 YES 1 12 1 1 0 0 0 1441894 1462888 | |21 YES 1 7 1 0 0 0 0 2481329 524871 | |22 YES 1 7 1 0 0 0 0 2523201 498375 |