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Source: ASTADS file at the DETAIL timespan
Function: This facility allows the storage administrator to
quickly identify the primary users of resources
critical to the operation of the storage I/O
subsystem. Most performance analysts are familiar
with the 80/20 rule, which states that 20% of your
users are responsible for 80% of the resource
usage on your system. Based on the increasing
demands being made upon storage administrators, it
is most effective to concentrate upon the usage of
the system by its primary users. This facility
allows the storage administrator to select one or
more critical resource measures for which
reporting will be done. The reports produced will
quickly identify primary resource consumers,
giving the storage administrator information about
where tuning activities will produce the best
results.
When potential problems have been detected by the
summary reports or charts in this facility, a
detail report option can be used to provide more
information about the area in question. This will
narrow specific problems down to the individual
hour and data set level, if necessary.
Features: As stated above, a wide variety of data selection
and summarization options are available. Data can
be summarized using one or more nodes of the data
set names, one or more of the CA MICS accounting
fields, or using a user-defined table that relates
data set prefixes with descriptions. Selection
and reporting can also be done by date, hour, and
zone. All of these options provide various views
and levels of detail, making it easy to quickly
identify and isolate problems.
The user is allowed to select the resource
elements that may be used for reporting, because
many different elements are available that measure
storage system activity. Several of these can be
selected in one report run, providing a large
amount of information from a single report
execution.
Output reports from this facility include tabular
reports, printer charts, and color graphic charts.
SMS
Issues: Users creating or modifying their SMS storage
classes and groups must carefully monitor the I/O
load on their existing applications, making sure
that load is distributed so as to provide the
desired performance for critical groups. These
reports will help the user design storage classes
and groups, and will allow the monitoring of
resources after SMS implementation to make sure
the SMS groups are still working correctly. This
continued monitoring is essential, as even
well-tuned groups may change as I/O workloads
fluctuate.
COLUMN DESCRIPTIONS
SYSID
This value appears at the top of each page and
identifies the System Identifier (system) to which
this data applies.
Owner
Represents the group to which the displayed totals
apply. This can be assigned using one or more of
the data set name nodes, one of more of the
CA MICS accounting fields, or using a
user-specified table that associates data set
prefixes with descriptive labels.
Date
The date during which the measurements shown on
this report were taken. The interval at which
measurements are taken, and the number of data
cycles included in the report will affect the
number of dates that appear in the output.
Hour
If summarization by hour was selected, the hour
during which the measurements on the report were
taken will be displayed.
Zone
If summarization by zone was selected, the CA MICS
zone during which the measurements on the report
were taken will be displayed.
Time
The time stamp taken from the detail record for
this particular group of totals. This represents
the approximate ending time of the measurement
interval.
Data Set Name
The name of the data set for which this line of
measurements apply.
Volume Serial Number
The volume serial number of the volume on which
the indicated data set resides.
Data Columns
One or more data columns will appear between the
Time and the Data Set Name columns. These will
contain the measurement element(s) you have
selected from the report options screen. If you
select more than one element with the same
alphabetic character, all these elements will
appear on the same detail report. The label
associated with each possible data column, and a
short description of what each value represents,
appears below:
Total I/O Duration
The total duration of all I/O requests issued
by this summary group during this measurement
interval. This represents the sum of IOS
queue time, pending time, disconnect time,
and connect time for all requests in this
group.
Total IOS Queue Time
The total amount of time spent by I/O
requests in this summary group waiting on the
IOS request queue to be scheduled.
Total Pending Time
The total amount of time spent in pending
status by I/O requests in this summary group.
This represents the time an I/O request must
wait for a clear path to the intended device.
Total Disconnect Time
The total amount of time spent in disconnect
status by I/O requests in this summary group.
This represents the interval between the time
the I/O request has been passed to the device
and the time the device is ready to transfer
data.
Total Connect Time
The total amount of time spent in connect
status by I/O requests in this summary group.
This represents the time that data is
actually being transferred between the device
and the processor.
Total I/O Requests
The total number of I/O requests issued by
all users in this summary group during this
measurement interval.
Total RPS Time
The total amount of time spent by I/O
requests in this summary group in RPS status.
This represents the time the request is
waiting while the DASD device is being
positioned to the correct sector.
Total Seek I/O Requests The total number of Seek
I/O requests issued by users in this summary
group during this measurement interval. A
seek request causes the read/write head of
the DASD device to position itself at a
specified cylinder address.
Average Seek Size in CYLS
The average seek distance, expressed in
cylinders, for each I/O request in this
summary group for this measurement interval.
This represents the average distance the DASD
read/write heads had to move to satisfy the
I/O requests for this group.
Average Response Time in Milliseconds
The average time, expressed in millionths of
a second, it took for each I/O request to
complete for the I/Os in this summary group
during this measurement interval.
Total Cache Effective (Hit) Count
The total number of I/O requests for this
summary group during this measurement
interval that were processed by cache, and
did not have to access the DASD device
directly.
Total Cache Candidate I/O Requests
The total number of I/O requests for this
summary group during this measurement
interval that were considered to be cache
candidates.
Total Non-Candidate I/O Requests
The total number of I/O requests for this
summary group during this measurement
interval that were considered to not be
candidates for caching.
Total Tracks Loaded
The total number of tracks loaded into the
cache on behalf of I/O requests in this
summary group during this measurement
interval.
Total DFW Tracks Loaded
The total number of tracks loaded into the
DASD Fast Write cache on behalf of I/O
requests in this summary group during this
measurement interval.
Total NVS Overflow Count
The total number of times that I/O requests
by this summary group caused the non-volatile
storage (NVS) cache area to become full and
overflow during this measurement interval.
Total Dispatching Exceptions
The total number of dispatching exceptions
that were caused by I/O requests in this
summary group during this measurement
interval. A display exception is caused when
excessive delay occurs getting an I/O
dispatched.
Total Dsname Exceptions
The total number of data set name exceptions
that were caused by I/O requests in this
summary group during this measurement
interval. A dsname exception is caused when
excessive delay occurs at the data set level.
Total Path Exceptions
The total number of path exceptions that were
caused by I/O requests in this summary group
during this measurement interval. A path
exception is caused when excessive delay
occurs at the I/O path level.
Total Seek Exceptions
The total number of seek exceptions that were
caused by I/O requests in this summary group
during this measurement interval.
Total Volume Exceptions
The total number of volume exceptions that
were caused by I/O requests in this summary
group during this measurement interval. A
volume exception is caused when excessive
delay occurs at the volume level.
Total Cross-Volume Exceptions
The total number of cross-volume exceptions
that were caused by I/O requests in this
summary group during this measurement
interval. A cross-volume exception is caused
when excessive delay occurs at the volume
level, caused by activity from another
system.
Total I/O When Volume Reserved
The total number of I/O requests issued by
this summary group during this measurement
interval when the intended device was
reserved by another user.
ASTEX / TOP RESOURCE CONSUMERS (STGEPF) CA MICS StorageMate - DETAIL ABC CORPORATION ------------------------------------ System Identifier=SYSA Owner=CORPORATE Date=05APR91 Hour=9 ------------------------------------ Time Total Total Data Set Name Volume Connect I/O Serial Time Requests Number 9:00 0:00:00.4 33 FIN.TEST.MASTER.LIB FIN008 9:00 0:00:00.5 143 FIN1.PROCLIB GLMRS1 9:00 0:00:04.3 1681 GENTEST.DEBUG11.FILE TSO059 9:00 0:00:01.6 315 GEN.GLSYSP.GENMENU GLMRS1 9:00 0:00:00.4 50 FIN.SPF.FINPLIB SYSWXA 9:00 0:00:02.0 457 FIN.GLSYST.FINLOAD SYSRS1 9:00 0:00:02.7 832 FIN.GLSYSP.FINMENU GLMRS1 9:00 0:00:02.0 459 FIN.GLSYSP.FINPENU GLMRS1 9:00 0:00:00.4 76 FIN999.TEST01.CONLIB1 TSO026 9:30 0:00:00.2 44 FIN.MIGR.TESTFILE FIN008 9:30 0:00:01.0 245 COR.MSTR99.ISFPLIB GLMRS1 9:30 0:00:01.5 265 GEN.GLSYSP.GENMENU GLMRS1 9:30 0:00:00.5 81 FIN.SPF.FINPLIB SYSWXA 9:30 0:00:01.7 391 FIN.GLSYST.FINLOAD SYSRS1 9:30 0:00:03.5 992 FIN.GLSYSP.FINMENU GLMRS1 9:30 0:00:02.8 626 FIN.GLSYSP.FINPENU GLMRS1 9:30 0:00:00.1 40 FIN999.TEST01.CONLIB1 TSO065 ----- ---------- ------------ HOUR 0:00:25.6 6730 ========== ============
Figure 4-17. ASTEX / Top Resource Consumers / Detail
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