Most of the RMF reports are issued either at the central processor complex (CPC) level for a global view, or at the logical partition (LPAR) level for each MVS image view.

The following two processes can be used to extract relevant data from the various RMF reports:

1.Determine which fields, from which reports, are useful for a DB2 performance analyst. Most of this data is also required by IBM storage specialists for disk evaluation.

2.Determine how to aggregate and handle the raw data to get resource level occupancy information.

11.2.1RMF Report Analysis

The data required for analyzing DB2 disk activity comes from four RMF reports which are produced by RMF Monitor I or Monitor III reporting (see Chapter 5, "Long-Term Overview Reporting with the Postprocessor" in the OS/390 RMF Report Analysis, SC28-1950).The two main RMF reports are cache and device:

•Cache Subsystem Activity - Cache Reports

The cache reports provide cache statistics on an LCU level referring to the LCU by its subsystem identifier (SSID). The accounting methodology for the number of I/Os is different from the methodology used for the device report. So, use a percentage instead of a value when you want to establish correlations between the two reports.

•Direct Access Device Activity - Device Report

The device report triggers path analysis through I/O queuing and provides information for all disk devices per LCU (referred by LCU number). The easiest way to associate this device information with complementary information in the cache reports is to use device number ranges. The device report is also an anchor point for measuring path activity.

To obtain path activity information, you can use use:

1.I/O Queuing Activity - IOQ Report

The IOQ report determines, for each LCU, the channel path identifiers (IDs) used. It also allows analysis of potential pending time issues due to channel subsystem.

2.Channel Path Activity - CHAN Report

The CHAN report gives channel link effective activity.

11.2.1.1 Cache Subsystem Activity Reports

RMF Monitor I gathers data for cache subsystem activity reports in SMF record type 74.5 as a default option. To produce the reports, specify:

REPORTS ( CACHE ( SUBSYS ) )

Note: The SUMMARY and DEVICE options must not be used.

I/O Performance and Monitoring Tools

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IBM 5695-DF1, 5655-DB2 manual RMF Report Analysis, Cache Subsystem Activity Reports, Reports Cache Subsys, 125
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5695-DF1, 5655-DB2 specifications

IBM 5655-DB2 and 5695-DF1 are significant components within the IBM software ecosystem, predominantly focusing on data management and integration solutions. These offerings cater primarily to enterprise environments that require robust database management systems and associated frameworks to maintain and manipulate data efficiently.

IBM 5655-DB2 is a well-known relational database management system (RDBMS) that excels in managing large volumes of structured data. Its architecture is designed to support high availability, scalability, and performance, crucial for businesses operating in today’s data-driven world. Some of its main features include advanced indexing capabilities, support for complex queries, and dynamic workload management. Additionally, it provides strong concurrency controls, which enable multiple users to access and manipulate data simultaneously without compromising data integrity.

One of the key characteristics of DB2 is its support for various data types, including JSON and XML, making it versatile for modern applications that generate data in diverse formats. It also features robust security mechanisms to protect sensitive data, aligning with compliance standards across industries. Integration with analytics tools further allows businesses to derive insights from their data, enhancing decision-making processes.

On the other hand, IBM 5695-DF1, also known as the InfoSphere DataStage, is a powerful data integration tool that facilitates the extraction, transformation, and loading (ETL) of data from various sources to target systems. It empowers organizations to streamline their data flows, ensuring that clean, consistent information is available for analysis and operational use. Key features of 5695-DF1 include a user-friendly graphical interface that enhances developer productivity and a rich set of connectors for numerous data sources, enabling seamless data integration.

DataStage also supports real-time data integration, allowing businesses to keep their data synchronized across multiple platforms. Its parallel processing capabilities dedicatedly optimize performance, enabling organizations to handle vast datasets efficiently. It incorporates data quality tools that help in validating and cleansing data before it is used for decision-making processes.

Both IBM 5655-DB2 and 5695-DF1 are part of a broader strategy to accommodate the evolving landscape of data management. Businesses leverage these technologies to enhance their data architectures, fostering agility and competitive advantage in their respective markets. Their integration capabilities, along with a focus on security and scalability, position them as vital assets in modern enterprise environments. Whether managing critical data within a database or ensuring seamless data flow across systems, these IBM offerings provide a comprehensive approach to handling complex data challenges.
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