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SMF 78-3 I/O Queuing Activity

  • Updated on Feb 29, 2024
  • Published on Apr 29, 2022
  • 2 minute(s) read
  • Alexandre BATARD
  • Guilhem PREVOT
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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

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