SMF What are I/O Activity Data Elements?

By default, the
MICS Batch and Operations Analyzer
interval, step, and job-level database records contain I/O activity data elements summarized to the device class level. These I/O related data elements are derived from the individual SMF type 30 address space records EXCP segments.
micsrm140cd
By default, the
MICS Batch and Operations Analyzer
interval, step, and job-level database records contain I/O activity data elements summarized to the device class level. These I/O related data elements are derived from the individual SMF type 30 address space records EXCP segments.
A set of I/O activity metrics are provided for the following device classes:
Device Classes
I/O Data Element Structure
COMMUNICATION
fff*COMM and fffMX#CO
DASD
fff*DASD and fffMX#DA
GRAPHICS
fff*GRAF and fffMX#GR
TAPE
fff*TAPE and fffMX#TA
UNIT-RECORD
fff*UREC and fffMX#UR
VIRTUAL I/O
fff*VIO and fffMX#VI
TAPE CARTRIDGE
fff*3480 and fffMX#CA (see Note)
where
fff
PGM or JOB for the step/interval and job-level files respectively
*
E for EXCP Count
A for Data Set Allocations
N for Number of Devices
C for Device Connect Time
#
N for Number of Devices
A for Data Set Allocations
For example, in a BATPGM01 observation, data element PGMCDASD contains the sum of device connect time from all SMF type 30 record EXCP segments where the device class was DASD (HEX '20' in the raw data).
Note:
The above list of device classes has one anomaly. Device Class TAPE CARTRIDGE is a subset of device class TAPE, rather than a unique device class. Device class TAPE data elements contain both round reel and cartridge I/O activity. Device Class TAPE CARTRIDGE contains the subset of TAPE activity where the device was a cartridge device. Refer to the I/O Measurements and Device Activity section for more details about device I/O activity metrics.