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Source: BATWDA file at the DAYS timespan
HARDVA file at the DAYS timespan
WLMSEC file at the DAYS timespan
Function: Monitors the I/O activity of each DASD volume,
based on the workload EXCP counts stored by
CA MICS in the BATWDA file.
Each user of the volume is identified by the WLM
Service Class name. This gives the storage
administrator the ability to monitor the work
being done on each volume during various time
periods.
Users planning for storage products that support
volume pooling can use this report to identify
usage patterns that must be known when defining
volume groups if proper performance is to be
received for each group.
Features: Detects current or potential performance problems
at the volume level, caused by an improper mix of
users on the volume.
Three different CA MICS files are combined to
produce this report. The user can set the
summarization level to day, zone, or hour, so that
both broad and narrow views of the data can be
obtained.
Volumes with low levels of I/O activity can,
optionally, be excluded from the analysis.
SMS
Issues: Identifying the primary users of each volume
during critical time periods is an important step
when planning SMS storage groups. This report
will enable you to group volumes with similar
workloads together, thus avoiding potential
performance problems caused by conflicting users.
COLUMN DESCRIPTIONS
Date
The date on which the activity shown on this
report occurred.
Volume Serial Number
The volume serial number of the storage medium.
Zone
If summarization by ZONE was specified on the
report options screen, this column will list the
ZONE value for which this data applies.
Hour
If summarization by Hour was specified on the
report options screen, this column will list the
hour for which this data applies.
Service Class Name
The name of the WLM Service Class that issued I/O
requests against this volume during this
measurement period. Similar tasks in MVS are
assigned to a common WLM Service Class, which is
controlled and reported by means of a service
class name.
Report Class Name
The name of the WLM Report Class that issued I/O
requests against this volume during this
measurement period. Similar tasks in MVS are
often grouped into a optional WLM Report Class,
which is used for reporting service and resource
consumption. Each WLM Report Class is known by a
unique name.
I/Os Per Sec.
The average number of I/O requests per second that
were directed to this volume from this workload.
This is calculated by dividing the number of I/O
requests by the length of the RMF measurement
interval, in seconds. This column is sorted so
that the workloads issuing the most requests will
appear first.
Percent of Total I/Os
The percentage of all the I/O requests for this
volume received during this measurement interval
that originated from this workload. This column
is sorted so that the workloads issuing the most
requests will appear first. For the '(SYSTEM)'
workload, this value represents the percentage of
the I/O for this volume that is not being captured
by MVS.
Number of I/O Requests
The total number of I/O requests for this volume
received during this measurement interval that
originated from this workload. This column is
sorted so that the workloads issuing the most
requests will appear first.
Device Addr.
The physical address of an I/O device.
Device Type
The type of I/O device.
Storage Group
In an installation running under Data Facility
Product (MVS/DFP) Version 3 with the Data Facility
Storage Management Subsystem (DFSMS) active,
STORNAME contains the Storage Group Name that is
the equivalent of a DASD pool name. It represents
a group of physical DASD volumes to be managed by
DFSMS and is defined by the installation's DASD
Storage Administrator.
I/O ACTIVITY BY WORKLOAD (STGEPC) 1 CA MICS StorageMate - DETAIL ABC CORPORATION ----------------------------------------------- System Identifier=SYS7 Date=22AUG90 ----------------------------------------------- Volume Hour Service Report I/Os Percent Number Device Device Storage Serial Class Class Per of Total of I/O Addr. Type Group Number Name Name Sec. I/Os Requests LNR907 10 TSO/DEF NONSYSUS 0.423 39.0 1522 14D 3380 (SYSTEM) 0.313 28.8 1125 BAT/DEF 0.217 20.0 782 STCLONG IAM 0.130 12.0 467 STCLONG JES2 0.001 0.1 3 STCSHORT 0.001 0.1 3 ------ ----- --------- 1.084 100.0 3903 LNR907 11 TSO/DEF NONSYSUS 0.924 70.9 3325 14D 3380 BAT/DEF 0.154 11.8 555 (SYSTEM) 0.154 11.8 553 STCLONG IAM 0.070 5.4 251 STCLONG JES2 0.001 0.1 3 ------ ----- --------- 1.302 100.0 4687 LNR908 10 BAT/DEF 0.640 35.7 2303 14F 3380 STC/LOW 0.431 24.0 1552 (SYSTEM) 0.396 22.1 1426 TSO/DEF NONSYSUS 0.326 18.2 1172 STCLONG IAM 0.001 0.0 2 ------ ----- --------- 1.793 100.0 6456 LNR908 11 TSO/DEF NONSYSUS 0.180 35.8 647 14F 3380 BAT/DEF 0.168 33.3 603 (SYSTEM) 0.153 30.5 551 STCLONG IAM 0.002 0.4 8 ------ ----- --------- 0.503 100.0 1809
Figure 4-41. I/O Activity by Workload / Detail
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