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412 VM/HSC 6.0 System Programmer’s Guide
1st ed., 6/30/04 - 312579601
How Systems Programmers Control Library Performance
Systems programmers command extensive control of overall library performance. This
control of performance is inherent with how a systems programmer:
• initially configures the library (during the LIBGEN process)
• uses available utilities and commands
• monitors and analyzes performance
• participates in the development of standard methods and procedures for the data
center.
How Operators Control Library Performance
An operator may participate in the initial configuration of a library; however, an operator
usually does not have control to change the majority of the static parameters set for library
operation at installation time. There are exceptions. Some commands relate to the same
functions initially set by PARMLIB control statements. These commands are available for
use by an operator for resetting some library parameters initially set at HSC installation
and initialization.
An operator impacts library performance primarily during daily operations with the use of
operator commands. These commands may be used when operator intervention is required
or when it is necessary to reset some static library parameter to improve performance.
Monitoring Library Activity and Performance
There are several methods to monitor library activity and performance:
• running the Activities Report utility to produce a detailed report identifying
performance values for various library activities.
The data in the report can be easily analyzed to produce performance criteria for your
installation.
• using the StorageTek Performance Measurement and Predictive Maintenance System
(PM2) to collect performance information.
• using Expert Library Manager (ExLM) to monitor performance and to balance
workload. For more information on ExLM, refer to the Expert Library Manager
User Guide and Reference.
Using the Activities Report Utility
The Activities Report utility can be used to effectively record, monitor, and analyze library
performance. Running the utility on a regular basis in addition to comprehensive analyses
can provide you with information disclosing total performance characteristics for your
library.
The Activities Report utility generates a report listing relative activity by volume groups.
Information reflected on this report can be used to redistribute resources and, if necessary,
to balance the cartridge activity load in a library.