Termos e Definições - V

The tape volume serial number or VOLSER is the method used to uniquely identify a tape volume. The VOLSER is specified in the tape label, which is the first set of information contained on the tape.

VM (Virtual Machine)
An IBM mainframe operating-system environment. VM manages a system so that all its resources — processors, storage and input/output devices — are available to many users at the same time. Each user has at his disposal the functional equivalent of a real dedicated system. Because this functional equivalent is simulated by VM and does not really exist, it is called a "virtual" machine.

VSAM (Virtual Storage Access Method)
IBM's access method for direct-access files. It is optimized for a virtual storage environment. Multiple Virtual Storage (MVS), Information Management System (IMS), Customer Information Control System (CICS) and DB2 all use VSAM. See DB2, CICS, IMS and MVS.

VSE (Virtual Storage Extended)
A multitasking, 370-architected IBM operating system akin to Multiple Virtual Storage (MVS). VSE work runs in partitions rather than address spaces, but is largely similar to MVS. See MVS.

VTAM (Virtual Telecommunications Access Method)
The main Systems Network Architecture (SNA) subsystem resident in an IBM mainframe that manages session establishment and data flow between terminals and application programs, or between application programs. See SNA.

VTS (virtual tape subsystem)
Tape library hardware and software extensions that utilize direct-access storage device (DASD) buffers to multiply the tape device count, throughput and storage density of tape library systems. See DASD.

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