Contents of the report

Notes:

On a machine running in LPAR mode, but with only one LPAR defined, the PART columns for the READ, WRITE and UTILIZATION fields display a zero value for channels of type FC (FICON).
When Channel Path Measurement Facility (CPMF) is not available, for example, on z/OS systems running as z/VM guests, RMF uses sampled data from SRM so that the reported channel utilization is only an approximate value. With increasing channel speed, the channel utilization value becomes more and more inaccurate. Therefore, in such cases, RMF does not provide accurate values of FICON channel utilization.
Beginning with z990 processors, the channel data from SRM is no longer available. As a result, the channel utilization data on a z/OS system running as z/VM guest, is reported as ------

Figure 1. Channel Path Activity report

                                           C H A N N E L   P A T H   A C T I V I T Y
                                                                                                                           PAGE    1
          z/OS V2R4              SYSTEM ID   CB88            DATE 05/11/2019            INTERVAL 14.59.999
                                 RPT VERSION V2R4 RMF        TIME 08.00.00              CYCLE 1.000 SECONDS

  IODF = 8E   CR-DATE: 09/14/2017   CR-TIME: 16.47.03   ACT: POR          MODE: LPAR        CPMF: EXTENDED MODE             CSSID: 2
 -----------------------------------------------------------------------------------------------------------------------------------
                                                    DETAILS FOR ALL CHANNELS
 -----------------------------------------------------------------------------------------------------------------------------------
    CHANNEL PATH             UTILIZATION(%)    READ(MB/SEC) WRITE(MB/SEC)        FICON OPERATIONS        ZHPF OPERATIONS   
 ID TYPE   G  SPEED SHR    PART  TOTAL    BUS   PART  TOTAL   PART  TOTAL      RATE  ACTIVE   DEFER    RATE  ACTIVE  DEFER  
 00 OSD         10G  Y     0.00   0.00   0.00   0.00   0.00   0.00   0.00                                                  
 02 OSE          1G  Y     0.00   0.00   0.00   0.00   0.00   0.00   0.00                                                  
 04 OSD         10G  Y     0.00   0.00   0.00   0.00   0.00   0.00   0.00                                                  
 05 OSD         10G  Y     0.00   0.00   0.00   0.00   0.00   0.00   0.00
 …
 74 CIB              Y   ------ ------                                                                                    
 75 CIB              Y   ------ ------                                                                                    
 92 ICP              Y   ------ ------                                                                                    
 93 ICP              Y   ------ ------                                                                                    
 C0 FC_S  13     8G  Y     0.00   0.00   0.00   0.00   0.00   0.00   0.00       0.0     0.0     0.0     0.0     0.0    0.0                                                 
    CHANNEL PATH             UTILIZATION(%)    READ(MB/SEC) WRITE(MB/SEC)        PHYSICAL NETWORK IDS         
 ID TYPE   G  SPEED SHR    PART  TOTAL    BUS   PART  TOTAL   PART  TOTAL      PORT 1              PORT 2       
 07 OSD          1G  Y     0.00   0.00   0.00   0.00   0.00   0.00   0.00      NETWORK1            NETWORK1   
 08 OSD          1G  Y     0.00   0.00   0.00   0.00   0.00   0.00   0.00      NETWORK1                       
 0C OSD          1G  Y     0.00   0.00   0.09   0.00   0.00   0.00   0.00      NETWORK7C5          NETWORK7C5 
 13 OSD          1G  Y     0.00   0.00   0.00   0.00   0.00   0.00   0.00      NETWORK7C2          NETWORK7C2   
 15 OSD         10G  Y     0.00   0.00   0.16   0.00   0.00   0.00   0.00      NETWORK1                       
 ...
    CHANNEL PATH     WRITE(B/SEC)     MESSAGE RATE     MESSAGE SIZE   SEND FAIL    RECEIVE FAIL     PHYSICAL 
 ID TYPE   G SHR     PART   TOTAL     PART   TOTAL     PART   TOTAL     PART       PART   TOTAL    NETWORK ID
 E5 IQD                 0       0        0       0  ------- -------          0        0       0    NETWORK7C5 
 F1 IQD                 0       0        0       0  ------- -------          0        0       0    NETWORK7C4
 F2 IQD                 0       0        0       0  ------- -------          0        0       0    NETWORK7C2

Table 1. Fields in the Channel Path Activity report
Field Heading	Meaning
IODF = xx	The IODF number where xx is the suffix of the IODF data set name.
CR-DATE: mm/dd/yyyy	The creation date of the IODF.
CR-TIME: hh.mm.ss	The creation time of the IODF.
ACT: text	The configuration state where text indicates how the IODF was activated.
MODE	The mode of the central processing complex (CPC): BASIC The report shows all channels configured in the system. LPAR The report shows both the total utilization and the individual partition's utilization of all channels configured to the logical partition.
CPMF	The availability of the Channel Path Measurement Facility (CPMF). CPMF allows RMF to report channel utilization information for individual partitions. The value can be: COMPATIBILITY MODE CPMF is running in compatibility mode. EXTENDED MODE CPMF is running in extended mode. NOT AVAILABLE CPMF is not available on the system. The indication `(CHANGED)` will be shown if the CPMF mode has changed during the reporting interval. In that case, only `TOTAL` values will be reported. For more information about CPMF, see the data area IRACPMB in z/OS MVS Data Areas in the z/OS Internet library.
CSSID	This field is shown only for z990 processors or follow-on processors and denotes the ID of the monitored logical channel subsystem.
CHANNEL GROUP G NO	For each channel type which is managed by DCM, a summary line is shown with the average values for all channels in this group. G indicates the generation and is used to differentiate between channels of the same channel type, when one has significant differences from the other. Newer generations with significant differences (for example, the channel throughput) are indicated by a number (1, 2, ...). For example, for a FICON channel, a number 1 indicates that the channel has an auto-negotiated throughput of 1 Gbit/sec, or a number 2 indicates a throughput of 2 Gbit/sec. The number of channels of the group is given in column NO.
CHANNEL PATH ID	The hexadecimal channel path identifier (CHPID).
CHANNEL PATH TYPE	Type of channel path. You may issue the console command `D M=CHP(xx)` to see an explanation of the channel path type. If RMF encounters an error while processing the TYPE data, this field is blank. RMF continues to measure channel path activity. Check the operator console for messages.
CHANNEL PATH G	This column indicates the generation and is used to differentiate between channels of the same channel type, when one has significant differences from the other. Newer generations with significant differences are indicated by a number (1, 2, ...). For example, for z/OS, a number 2 indicates that a FICON channel has auto negotiated to a link speed of 2 GB/sec.
CHANNEL PATH SPEED	The channel path speed in bits per second at the end of the interval.
CHANNEL PATH SHR	The indication of whether the channel path is defined as shared between one or more logical partitions. Y indicates that the channel path is shared. A blank indicates it is not shared.
PHYSICAL NETWORK ID(S)	Physical-network identifiers (PNET IDs) of an Ethernet network that is accessible from the ports of the channel path.
UTILIZATION (%) PART	The channel path utilization percentage for an individual logical partition. RMF uses the values provided by CPMF. In LPAR mode, the calculation is: `PART Channel Path Busy Time UTILIZATION (%) = ------------------------- * 100 Channel Path Elapsed Time` For channels like FICON, OSA Express, or OSA Direct Express, which are running in extended CPMF mode, the calculation is as follows: `Part LPAR # of Channel Work Units Utilization (%) = ------------------------------------------------------- * 100 Max # of Channel Work Units * Channel Path Elapsed Time` For some channels like OSAEGbE, FICON EXPRESS/EXPRESS2, this value reflects the microprocessor utilization. For hipersockets, this value is not available.
UTILIZATION (%) TOTAL	The channel path utilization percentage for the CPC during an interval. For processors earlier than z990 and shared channels in LPAR mode, where CPMF is not available, or for all channels in BASIC mode with CPMF not available, the calculation is: `# SRM Observations of Total Channel Path Busy Utilization (%) = --------------------- * 100 # Samples` For unshared channels in LPAR mode, the value for total utilization is the same as partition utilization. For channels like FICON, OSA Express, or OSA Direct Express, which are running in extended CPMF mode, the calculation is as follows: `Total Total # of Channel Work Units Utilization (%) = ------------------------------------------------------- * 100 Max # of Channel Work Units * Channel Path Elapsed Time` For some channels like OSAEGbE, FICON EXPRESS/EXPRESS2, this value reflects the microprocessor utilization. For hipersockets, this value is not available.
UTILIZATION (%) BUS	Percentage of bus cycles, the bus has been found busy for this channel in relation to the theoretical limit. For OSAEGbE, the value reflects the PCI bus utilization. For hipersockets, this value is not available.
READ(MB/SEC)	PART Data transfer rates from the control unit to the channel for this partition. TOTAL Data transfer rates from the control unit to the channel for the CPC. For hipersockets, this value is not available.
WRITE(MB/SEC)	PART Data transfer rates from the channel to the control unit for this partition. TOTAL Data transfer rates from the channel to the control unit for the CPC.
FICON OPERATIONS	RATE Number of native FICON operations per second. ACTIVE The average number of native FICON operations that are concurrently active during the reporting interval. DEFER Number of deferred native FICON operations per second that could not be initiated by the channel due to the lack of available resources. This field is reported for the CPC.
ZHPF OPERATIONS	RATE Number of zHPF (High Performance FICON) operations per second. ACTIVE The average number of zHPF operations that are concurrently active during the reporting interval. DEFER Number of deferred zHPF operations per second that could not be initiated by the channel due to the lack of available resources. This field is reported for the CPC.
WRITE(B/SEC)	PART Data transfer rates from the channel to the control unit for this partition. TOTAL Data transfer rates from the channel to the control unit for the CPC. The values are shown in bytes/second. This field is for HiperSockets.
MESSAGE RATE	PART Rate of messages sent by this partition. TOTAL Rate of messages sent by the CPC. This field is for HiperSockets.
MESSAGE SIZE	PART Average size of messages sent by this partition. TOTAL Average size of messages sent by the CPC. This field is for HiperSockets.
SEND FAIL PART	Rate of messages (sent by this partition) that failed. This field is for HiperSockets.
RECEIVE FAIL	PART Rate of messages (received by this partition) that failed due to unavailable buffers. The value could indicate, that more receive buffers are required. TOTAL Rate of messages (received by the CPC) that failed due to unavailable buffers. This field is for HiperSockets.