2. PERFORMANCE REPORTING ANALYSIS › 2.4 I/O Configuration Analysis › 2.4.2 Usage Guidelines
2.4.2 Usage Guidelines
The primary consideration for the use of the I/O
Configuration Analysis inquiries is the volume of data
specified for processing by each of the analytic routines.
We recommend the following guidelines for using the I/O
Configuration Analysis inquiries:
o Use Shared DASD Analysis inquiry to analyze short peak
intervals for a single day or over several days.
Large volumes of data should not be processed, since
pronounced shared DASD problems that may exist over a
short period of time can be lost when averaged in with
a significant number of hours in which no problems
existed. For example, the inquiry is best used to
analyze the impact of shared DASD during the execution
of online systems or during long-running batch jobs.
o Use the DASD I/O Component Analysis inquiry to analyze
short peak intervals for a single day. Once again,
the problems that this algorithm identifies are easily
washed out by the summarization of multiple hours.
o Use the DASD Skew Analysis inquiry to analyze one- or
two-hour periods. DASD skew is an extremely transient
problem that can be hidden by the summarization of
even a few hours.
o Provide the DASD Multiple Volume Analysis inquiry with
the maximum possible volume of input data. Before
mapping volumes together, you should analyze the
consequences of the decision in every possible
environment.
o Use the Tape Drive Simulation Analysis inquiry to
analyze short peak intervals for a single day or over
several days. Large volumes of data should not be
processed over long time intervals, since pronounced
tape drive utilization problems that may exist over a
short period of time can be lost when averaged in with
a significant number of hours in which no problems
exist. The inquiry is best used to analyze the impact
of tape drive utilization during long-running batch
jobs or during periods when multiple batch jobs may be
constrained by the availability of tape drives.
Although you may wish to evaluate other quantities of data,
we suggest that you follow the recommendations made in this
section until you are familiar with the interpretation of the
reports.
Figure 2-87 shows the I/O Configuration Analysis Menu, which
you can use to select the various I/O Configuration Analysis
reports.
/------------------- Input/Output Configuration Analysis (IOA) -------------------\
| Option ===> |
| |
| Composing CA MICS Inquiry: IOA01 - Volume Migration Study |
| |
| 1 - Shared DASD Analysis |
| Analysis of the effects of shared DASD usage. |
| 2 - DASD I/O Component Analysis |
| Analysis of the component parts of DASD response time. |
| 3 - DASD Skew Analysis |
| Analysis of string utilization. |
| 4 - Multiple DASD Volume Analysis |
| Analysis of DASD volume combination on activity. |
| 5 - Tape Drive Simulation Analysis |
| Simulation of tape drive utilization by program. |
| |
\-------------------------------------------------------------------------------/
Figure 2-87. I/O Configuration Analysis Menu
