---
title: "SMF 74-5 Cache Subsystem Device Activity"
slug: "smf-74-5-cache-subsystem-device-activity"
updated: 2024-02-28T16:46:43Z
published: 2024-02-28T16:46:43Z
canonical: "docs.zetaly.io/smf-74-5-cache-subsystem-device-activity"
---

> ## 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 74-5 Cache Subsystem Device Activity

## Introduction

## Fields

Stored in cacheData

| SMF Field | DB Column name | Description | Unit |
| --- | --- | --- | --- |
|  | recType | Value is always CHE |  |
| SMF74DAT | startTime | Date when the RMF measurement interval started |  |
| SMF74IST | startTime | Time when the RMF measurement interval started |  |
| SMF74DTE | endTime | Date when the record was moved into the SMF buffer |  |
| SMF74TME | endTime | Time when the record was moved into the SMF buffer |  |
| SMF74INT | seconds | Duration of the RMF measurement interval | second |
| SMF74SID | sid | System identification (from the SID parameter) |  |
| SMF74XNM | sysplex | Sysplex name ( in the COUPLExx parmlib member) |  |
| SMF74SNM | systemName | System name (r in the IEASYSxx parmlib member) |  |
| R745DVOL | volser | Volume serial of device |  |
| R74CCMT | storageArray | Type and Model |  |
| R745DEVN | devnum | Device number |  |
| R745DSID | ssid | Subsystem ID |  |
| R74CCMT | typeNum | First element of **storageArray** |  |
| R74CCMT | modelNum | Second element of **storageArray** |  |
| R74CCMT | manufacture | Third element of **storageArray** |  |
| R74CCMT | plant | Fourth element of **storageArray** |  |
| R74CCMT | seqNum | Fifth element of **storageArray** |  |
| R745DVID | tag | Storage Tag + Device Address |  |
| R745SDEV | cuDevnum | CU Device number |  |
| R745SDID | cuTag | Storage Tag + CU Device ID |  |
| R7451XID | xpid | Extension Pool ID |  |
| R7452XTY | xpType | Extension Type + XFL |  |
| R745DRCR | cacheRead | Read Cache Request |  |
| R745DCRH | cacheReadHit | Read Cache HITS |  |
| R745DWRC | cacheWrite | Write Cache Request |  |
| R745DWCH | cacheWriteHit | Write Cache HITS |  |
| R745DICL | cacheInhibit | Inhibit Cache Load |  |
| R745DBCR | cacheBypass | Bypass Cache Request |  |
| R745DRSR | seqRead | Read Sequence Request |  |
| R745DRSH | seqReadHit | Read Sequence HITS |  |
| R745DWSR | seqWrite | Write Sequence Request |  |
| R745DWSH | seqWriteHit | Write Sequence HITS |  |
| R7452PRO | phyRead | Physical Read |  |
| R7452PWO | phyWrite | Physical Write |  |
| R7452PBR | phyReadByte | Physical Read Bytes |  |
| R7452PBW | phyWriteByte | Physical Write Bytes |  |
| R7452PRT | phyReadRt | Physical Read R.T. |  |
| R7452PWT | phyWriteRt | Physical Write R.T. |  |
| R7451CT1 | byteRead | Bytes read |  |
| R7451CT2 | byteWrite | Bytes write |  |
| R7451CT3 | byteReadRt | Read reponse time |  |
| R7451CT4 | byteWriteRt | Write response time |  |
| R745DRNR | nretRead | Read non-retentive |  |
| R745DNRH | nretReadHit | Read non-retentive HITS |  |
| R745DWNR | nretWrite | Write non-retentive |  |
| R745DWNH | nretWriteHit | Write non-retentive HITS |  |
| R745DTC | xfrSeqDasd | Sequence DASD to XFR |  |
| R745DNTD | xfrNormDasd | Normal DASD to XFR |  |
| R745DCTD | xfrCacheDasd | Cache DASD to XFR |  |
| R745DFWB | fwBypass | Fast Write Bypass |  |
| R745DFWC | fwCache | F.W. Cache Request |  |
| R745DFWS | fwSeq | F.W. Sequence Request |  |
| R745DCRM | recCacheMiss | Record Cache Miss |  |
| R745DCWP | recCacheWrPro | RCD Cache Write Pro |  |
| R7452RMR | recModeRead | Record Mode Read |  |
| R745DKDW | ckdWrite | CKD Write |  |
| R745DKDH | ckdWriteHit | CKD Write HITS |  |
| R745DFWR | cfwBypass | CFW Bypass |  |
| R7451RSV | lowIntRt | Lower Interference R.T. |  |
| R7451CT5 | zhpfRead | ZHPF Read I/O |  |
| R7451CT6 | zhpfWrite | ZHPF Write I/O |  |
| R7451XSF | xrcRead | XRC or CC Read |  |
| R7451XCW | xrcWrite | XRC or CC Contaminated writes |  |
| R7451TSP | pprcTrack | Number of tracks transferred to secondary Peer-to-Peer-Remote-Copy(PPRC) volume |  |
|  | actionId |  |  |
|  | cec_name |  |  |
|  | cec_type |  |  |
|  | cec_model |  |  |
|  | lpar_name |  |  |