SMF 78-3 I/O Queuing Activity
- 29 Feb 2024
- 2 Minutes to read
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SMF 78-3 I/O Queuing Activity
- Updated on 29 Feb 2024
- 2 Minutes to read
- Contributors
- Print
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Introduction
Reports I/O queuing activity and HyperPAV and SuperPAV activity. It contains an entry for each logical control unit that had any activity during the interval.
Fields
Stored in pavData
| SMF Field | DB Column name | Description | Unit |
|---|---|---|---|
| recType | Value is always 0 | ||
| SMF78DAT | startTime | Date when the RMF measurement interval started | |
| SMF78DTE/TME | endTime | Date when the record was moved into the SMF buffer | |
| SMF78INT | seconds | Duration of the RMF measurement interval | second |
| SMF78SID | sid | System identification | |
| SMF78XNM | sysplex | Sysplex name as defined in parmlib member COUPLExx | |
| SMF78SNM | systemName | System name for current system as defined in parmlib member IEASYSxx SYSNAME parameter | |
| R783ID2 | lcu | Logical control unit identifier | |
| R783CSS | cssid | Channel Subsystem ID | |
| R783CU1 | cunum | First control unit attached | |
| R783DST | lcuFlags | Data Status | |
| R783GFLG | globalFlags | IOQ global flags | |
| R783CFL | cfgFlags | Configuration change flags | |
| SMF78SAM | sampleCount | Number of RMF samples | |
| R783QSM | accQueueLen | Sum of total length of the CU-HDR queue | |
| R783QCT | queueLength | Number of entries on the CU-HDR queue | |
| R783HAIU | maxAlias | The high water mark of the number of in-use HyperPAV-alias devices for the LSS | |
| R783HCAD | maxBaseUse | The high water mark of the number of aliases concurrently in use by one of the HyperPAV-base devices of the LSS | |
| R783HIOQ | maxQueued | The high water mark of queued I/O requests | |
| R783MCMN | minChannel | Minimum number of DCM managed channels used | |
| R783MCMX | maxChannel | Maximum number of DCM managed channels used | |
| R783MCDF | defChannel | Defined number of DCM managed channels | |
| R783PTM | pathTaken | Accumulated path taken count for DCM managed channels | |
| R783DPBM | portBusy | Accumulated director port busy count for DCM managed channels | |
| R783CUBM | cuBusy | Accumulated control unit busy count for DCM managed channels | |
| R783SBSM | switchBusy | Switch busy count summation for DCM-managed channels | |
| R783HNAI | pavMisses | The number of times an I/O could not start because no HyperPAV-aliases were available | |
| R783HTIO | pavIo | The total number of HyperPAV I/O requests for the LSS | |
| R783DCTM | connTime | Accumulated device connect time | 128 microseconds |
| R783DDTM | discTime | Accumulated device disconnect time | 128 microseconds |
| R783CBTM | dcBusyTime | Accumulated delay time for DCM-managed channels because of a busy control unit | |
| R783CMRM | dcCmrTime | Accumulated initial command response time for DCM-managed channels | |
| R783CSST | cssTime | Channel subsystem wait time | 128 microseconds |
| R783DST | isPav | ||
| R783DST | isDcm | ||
| actionId |
Stored in lcuData
| SMF Field | DB Column name | Description | Unit |
|---|---|---|---|
| recType | Value is always 0 | ||
| SMF78DAT | startTime | Date when the RMF measurement interval started | |
| SMF78DTE/TME | endTime | Date when the record was moved into the SMF buffer | |
| SMF78INT | seconds | Duration of the RMF measurement interval | second |
| SMF78SID | sid | System identification | |
| SMF78XNM | sysplex | Sysplex name as defined in parmlib member COUPLExx | |
| SMF78SNM | systemName | System name for current system as defined in parmlib member IEASYSxx SYSNAME parameter | |
| R783ID2 | lcu | Logical control unit identifier | |
| R783CPID | chpid | Channel path identifier | |
| R783CSS | cssid | Channel Subsystem ID | |
| R783CU1 | cunum | First control unit attached | |
| R783CFL | chpFlags | Configuration change flags | |
| R783CPAT | pathFlags | Path attributes | |
| SMF78SAM | sampleCount | Number of RMF samples | |
| R783PT | takeCount | Number of times channel path was taken | |
| R783CBTM | busyTime | Accumulated delay time for DCM-managed channels because of a busy control unit | second |
| R783CMRM | cmrTime | Accumulated initial command response time for DCM-managed channels | second |
| actionId |