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Source: BATWDA file at the DAYS timespan
HARDVA file at the DAYS timespan
WLMSEC file at the DAYS timespan
Function: This chart provides a graphic view of the I/O
activity against 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, which is then displayed on the
chart.
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: Three different CA MICS files are combined to
produce this chart. 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. This chart is useful in detecting
current or potential performance problems at the
volume level, caused by an improper mix of users
on the volume.
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 chart
occurred.
Volume
The volume serial number of the storage medium.
Zone
If summarization by ZONE was specified on the
report options screen, the data on this chart will
only apply for this ZONE.
Hour
If summarization by Hour was specified on the
report options screen, the data on this chart will
only apply for this hour.
Pie Slices
Each slice represents the number of I/O requests
for this volume received during this measurement
interval that originated from a particular
workload. The percentage value represents the
percentage of all requests received that
originated from each workload.
Pie Labels
Each slice identifies the name of the workload
that issued I/O requests to this volume. Similar
tasks in MVS are assigned to a common WLM Service
Class, which is controlled and reported by means
of a service class name. A value of '(SYSTEM)'
(?) in the label is used to represent uncaptured
I/O requests. This refers to I/O requests that
are captured in the totals from RMF for the
device, but are not captured by SMF and assigned
to the proper user. This is a 'normal' occurrence
for all MVS systems, as some work performed by the
operating system is considered to be overhead, and
is not captured in job accounting.
I/O ACTIVITY BY WORKLOAD (STGEPC) 2 CA MICS StorageMate ABC CORPORATION System Identifier=SYS7 DATE=22AUG90 Volume=LNR907 Hour=10 SUM PIE CHART OF WDAEXCPS GROUPED BY WLMCLASS *.******************* ***** . ***** *** . *** ** .. *** (SYSTEM) ** . *** ** . ** ** . *** BAT/DEF ** .. ** * . ** * . ** ** . 1125.27 * * . 28.83% ** * 782.183 . ** * 20.04% . * * . * * . * * . * * . * * . * * . * . . . . . . . . . . . . . . . . . * * + . . . . . . . . . . . . . * * . . . . . * .. * * . * * . * * 467.288 .. * * 11.97% . * STC/IAM * . * * . * * . . * * . ** * . ** * . . ** * . ** * . 1521.83 ** ** 38.99% ** ** *** ** ** ** *** ** *** *** *** ***** ***** ********** ********** TSO/DEF *
Figure 4-40. I/O Activity by Workload / Chart
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