---
title: "SMF 42-6 DASD data set level I/O statistics"
slug: "smf-42-6-dasd-data-set-level-io-statistics"
updated: 2024-02-28T13:49:23Z
published: 2024-02-28T13:49:23Z
canonical: "docs.zetaly.io/smf-42-6-dasd-data-set-level-io-statistics"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zetaly.io/llms.txt
> Use this file to discover all available pages before exploring further.

# SMF 42-6 DASD data set level I/O statistics

## Introduction

## Fields

Stored in smsData

| SMF Field | DB Column name | Description | Unit |
| --- | --- | --- | --- |
|  | recType | Value is always 042 |  |
| SMF42PTS | startTime | Interval Start or OPEN time of day. This is zero if not available |  |
| SMF42DTE/TME | endTime | Date when the record was moved into the SMF buffer |  |
|  | seconds | Time between start and end datetime | second |
| SMF42SID | sid | System identification |  |
| S42DSN | dsname | Data set name |  |
| S42DSVOL | volser | Volume serial number |  |
| S42JDRSD/RST | jobRdrTime | Date reader recognized the JOB card for this job |  |
| S42JDJNM | jobName | Job name |  |
| S42JDUID | racfUser | User-defined identification field |  |
| S42JDPGN | pgn | Job performance group number |  |
| S42DSSC | smsStorCls | Storage class name |  |
| S42JDWSC | wlmClass | Workload Manager (WLM) Service Class Name |  |
| S42JDWLD | wlmWorkload | Workload Manager (WLM) workload name |  |
| S42DSFL1 | dsDescrFlag | Data set descriptor flag |  |
| S42DSCOD | entryFlag | Entry descriptor flag |  |
| S42DSDEV | devnum | Device number |  |
| SMF42SSI | ssid | Subsystem identification |  |
| S42JDCOD | subType | 1. Close 2. Interval record |  |
| S42DSTYP | dsType | Data set type |  |
| S42DSBSZ | blkSize | Block size. For concatenated data sets, this data is taken from the first data set |  |
|  | useCount |  |  |
| S42DSTRP | stripes | Number of stripes |  |
| S42DSION | totIo | Total number of I/Os |  |
| S42DSRDT | totRead | Total number of read operations |  |
| S42DSCND | cacheIo | Number of cache candidates |  |
| S42DSSEQ | seqIo | Number of sequential I/O operations |  |
| S42DSWCN | writeIo | Number of write candidates |  |
| S42DSRLC | rlsIo | Number of record level cache I/O operations |  |
| S42DSICL | inhibitIo | Number of inhibit cache load I/O operations |  |
| S42DSSHTS | cacheHits | Number of cache hits |  |
| S42DSWHI | writeHits | Number of write hits |  |
| S42AMSRB | seqReadBlk | Sequential read: number of blocks |  |
| S42AMDRB | randReadBlk | Direct read: number of blocks |  |
| S42AMSWB | seqWriteBlk | Sequential write: number of blocks |  |
| S42AMDWB | randWriteBlk | Direct write: number of blocks |  |
| S42AMZRB | dirRead | Number of directory reads |  |
| S42AMZWB | dirWrite | Number of directory writes |  |
|  | avgRespTime |  | second |
|  | avgConnTime |  | second |
|  | avgPendTime |  | second |
|  | avgDiscTime |  | second |
|  | avgQueueTime |  | second |
|  | avgActvTime |  | second |
|  | avgReadDiscTm |  | second |
| S42DSMXR | maxRespTime | Maximum data set I/O response time | second |
| S42DSMXS | maxServTime | Service time associated with maximum I/O response time | second |
| S42AMSRR | seqReadDly | Sequential read: I/O delay | second |
| S42AMDRR | randReadDly | Direct read: total I/O delay | second |
| S42AMSWR | seqWriteDly | Sequential write: I/O delay | second |
| S42AMDWR | randWriteDly | Direct write: total I/O delay | second |
| S42AMZRR | dirReadDly | Directory read: I/O delay | second |
| S42AMZWR | dirWriteDly | Directory write: I/O delay | second |
| S42DSCOD | isOpen | Bit 0 |  |
| S42JDCOD | isClose | True if subType == 0 |  |
| S42JDCOD | isInterval | True if subType != 0 |  |
| S42DSTYP | isPs |  | True if dsType == 1 |
| S42DSTYP | isPds | True if dsType == 2 |  |
| S42DSTYP | isPdse | True if dsType == 3 |  |
| S42DSTYP | isDa | True if dsType == 4 |  |
| S42DSTYP | isHfs | True if dsType == 10 |  |
| S42DSTYP | isVsam | True if 16 <= dsType <= 22 |  |
|  | actionId |  |  |