ERROR

 

 

 

VSE

 

MVS

 

 

 

 

 

 

Byte Bit

Byte

Bit

Wrong-length record

 

 

0

1

2

 

1

Nondata transfer error

 

 

0

2

2

 

6

Space not found on track

 

 

0

4

2

 

2

Reference outside extents of data set or file

0

7

3

 

3

Data check in count area

 

 

1

0

2

 

4

Track overrun

 

 

 

1

1

**

**

End-of-cylinder

 

 

 

1

2

**

**

Data check when reading key or data

 

1

3

2

 

4

Record not found

 

 

 

1

4

2

 

B

End-of-file

 

 

 

1

5

2

 

5

End-of-volume

 

 

 

1

6

 

 

 

Invalid request

 

 

 

*

 

2

 

3

Uncorrectable error other that I/O

 

*

 

2

 

6

Read with exclusive control not preceded by

 

 

 

 

 

write with exclusive control

 

 

*

 

2

 

7

WRITE macro used when DCB specified input

*

 

3

 

1

Extended search specified with DCB IIMCT = 8

*

 

3

 

2

WRITE Mith ID addressed RO

 

 

*

 

3

 

4

Key was specified as search argument when

 

 

 

 

 

KEYLEM = 8 or no key address was given

*

 

3

 

5

Request for options not in the DCB

 

*

 

3

 

6

Attempt to add fixed-length record with key

 

 

 

 

 

beginning with hex ′ FF′ .

 

 

*

 

3

7

 

* These errors are not included in the VSE exception codes.

 

 

** These conditions do not occur under MVS.

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure

41. VSE Error Bytes and MVS Exception Code Bits

 

 

 

 

READ Macro

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VSE

 

READ

filename

,

KEY

 

 

 

 

 

 

 

 

(1)

 

ID

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ecbname,type,

R

, dcbaddress

,

 

 

 

 

 

 

 

RU

(2-12)

 

 

 

 

MVS

 

READ

area address

,

length

 

 

 

 

 

 

 

 

(2-12)

 

(2-12)

 

 

 

 

 

 

 

 

′ S′

 

′ S′

 

 

 

 

 

 

 

 

keyaddress ,

blockaddress

,

next address

 

 

 

 

(2-12)

(2-12)

 

(2-12)

 

 

 

 

 

′ S′

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Notes:

1.TYPE - DI, DIF, DIX, DK, DKF, or DKX. R or RU can be suffixed to the type code only if spanned records are being processed. R signifies that the system is to return the relative track address of the next data record in the area specified by the next address operand. RU signifies that the system is to return the relative track address of either the next capacity record (R0) or

data record, whichever occurs first. If R or RU is used, you must code the length operand as S′.

2.S- system will supply the operand if you specify S′.

Chapter 13. A s s e m b l e r 313

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IBM OS/390 manual Error VSE MVS, VSE Error Bytes and MVS Exception Code Bits

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.