129, R E C T a C C E S S D E V I C E a C T I V I T Y

•Disconnect time, which covers all internal LCU delays primarily due to a prerequisite process in the storage server; for instance, staging activity for cache misses, or PPRC propagation of the I/O to the secondary site

•Connect time, which covers effective data transfer activity

Queuing time is called I/O supervisor queuing (IOSQ) time in RMF reports, and covers delays involved by aggregate application interactions on the same volume for that LPAR.

Several LPARs (weighted by activity) sharing the same storage servers must be consolidated to establish value correlations with CACHE reporting.

					D I R E C T A C C E S S D E V I C E A C T I V I T Y
	OS/390				SYSTEM ID IPO4				START 11/19/1998-10.30.00						INTERVAL 001.00.00
	REL. 02.05.00				RPT VERSION 2.4.0				END 11/19/1998-11.30.00						CYCLE 1.000 SECONDS
TOTAL SAMPLES = 3,600			IODF = 40		CR-DATE: 11/05/98			CR-TIME: 16.56.05				ACT: POR
					DEVICE	AVG	AVG	AVG	AVG	AVG	AVG	AVG	AVG	%		%	%	AVG	%	%
STORAGE	DEV	DEVICE	VOLUME	LCU	ACTIVITY RESP IOSQ			DPB	CUB	DB	PEND	DISC	CONN	DEV		DEV	DEV	NUMBER	ANY	MT
GROUP	NUM	TYPE	SERIAL		RATE	TIME TIME		DLY	DLY	DLY	TIME	TIME	TIME	CONN		UTIL	RESV	ALLOC	ALLOC	PEND
SGDB2TS	0103	33903	VLD273	0026	0.053	20	0	0.0	0.0	0.0	0.6	13.0	6.7	0.04		0.10	0.0	64.9	100.0	0.0
SGDB2TS	0105	33903	VLD274	0026	0.102	4	0	0.0	0.0	0.0	0.6	1.8	1.5	0.02		0.03	0.0	22.0	100.0	0.0
SGDB2TS	0107	33903	VLD275	0026	0.706	15	0	0.0	0.0	0.0	0.5	12.3	2.0	0.14		1.01	0.0	31.0	100.0	0.0
SGDB2TS	0109	33903	VLD276	0026	0.224	12	0	0.0	0.0	0.0	0.5	9.8	1.4	0.03		0.25	0.0	22.0	100.0	0.0
SGDB2TS	013A	33903	VLD270	0026	0.003	5	0	0.0	0.0	0.0	0.3	3.6	0.7	0.00		0.00	0.0	0.0	100.0	0.0
SGDB2TS	013B	33903	VLD301	0026	0.109	8	0	0.0	0.0	0.0	0.6	6.2	1.4	0.02		0.08	0.0	62.0	100.0	0.0
SGDB2TS	0384	33903	VLD312	0031	0.008	9	0	0.0	0.0	0.0	0.7	5.1	3.6	0.00		0.01	0.0	17.0	100.0	0.0
SGDB2TS	0396	33903	VLD286	0031	0.036	7	0	0.0	0.0	0.0	0.9	5.1	1.3	0.00		0.02	0.0	60.0	100.0	0.0
SGDB2TS	03BF	33903	VLD219	0031	0.065	21	9	0.0	0.0	0.1	0.9	6.4	4.9	0.03		0.07	0.0	29.0	100.0	0.0
SGDB2TS	0D0B	33903	VLD265	0063	0.131	2	0	0.0	0.0	0.0	0.4	0.6	1.5	0.02		0.03	0.0	14.0	100.0	0.0
SGDB2TS	0D13	33903	VLD285	0063	0.018	4	0	0.0	0.0	0.0	0.4	2.9	1.0	0.00		0.01	0.0	20.7	100.0	0.0
SGDB2TS	0D14	33903	VLD307	0063	0.062	2	0	0.0	0.0	0.0	0.4	0.5	1.0	0.01		0.01	0.0	20.9	100.0	0.0
SGDB2TS	0D22	33903	VLD310	0063	0.011	6	0	0.0	0.0	0.0	0.5	4.4	1.1	0.00		0.01	0.0	32.0	100.0	0.0
SGDB2TS	4066	33903	VLD538	0076	0.675	20	4	0.0	0.0	0.0	0.5	11.4	4.1	0.28		1.05	0.0	103	100.0	0.0
SGDB2TS	4067	33903	VLD539	0076	3.926	31	15	0.0	0.0	0.0	0.3	8.9	6.5	2.54		6.05	0.0	107	100.0	0.0
SGDB2TS	4068	33903	VLD540	0076	2.526	20	5	0.0	0.0	0.0	0.3	5.4	9.5	2.40		3.75	0.0	120	100.0	0.0
SGDB2TS	407F	33903	VLD563	0076	1.076	12	2	0.0	0.0	0.0	0.4	7.2	2.5	0.27		1.05	0.0	112	100.0	0.0
SGDB2TS	4080	3390	VLD564	0077	1.276	13	3	0.0	0.0	0.0	0.4	7.1	2.4	0.31		1.21	0.0	87.7	100.0	0.0
SGDB2TS	4081	3390	VLD565	0077	1.456	16	2	0.0	0.0	0.0	0.4	7.1	5.8	0.84		1.87	0.0	90.9	100.0	0.0
SGDB2TS	4095	3390	VLD585	0077	0.179	15	0	0.0	0.0	0.0	0.9	10.4	3.9	0.07		0.26	0.0	54.0	100.0	0.0
SGDB2TS	4096	3390	VLD586	0077	1.797	12	1	0.0	0.0	0.0	0.3	6.9	3.8	0.68		1.93	0.0	119	100.0	0.0
SGDB2TS			SG		107.550	17	5	0.0	0.0	0.0	0.4	7.4	3.9	0.43		1.27	0.0	6879	100.0	0.0

Figure 50. Direct Access Device Activity Report

The Direct Access Device Activity report provides detailed information for each (functional) volume and consolidates the information at the LCU (or Storage Group when required) level.

The fields to review are:

•LCU, reference number used lo locate which CHAN report data to analyze

•DEVICE ACTIVITY RATE, rate per second at which start subchannel (SSCH) instructions to the device completed successfully

•AVG RESP TIME, response time in milliseconds

•AVG IOSQ TIME, queuing time in IOSQ on the device

•AVG PEND TIME, pending time

•AVG DISC TIME, disconnect time

I/O Performance and Monitoring Tools

129 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.

IBM 5695-DF1, 5655-DB2 manual 129, R E C T a C C E S S D E V I C E a C T I V I T Y

Models: 5695-DF1 5655-DB2

D I R E C T A C C E S S D E V I C E A C T I V I T Y

UTIL

03BF

Figure 50. Direct Access Device Activity Report

129

5695-DF1, 5655-DB2 specifications