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Virtual Storage Access Method (VSAM) [1] is an IBM direct-access storage device (DASD) file storage access method, first used in the OS/VS1, OS/VS2 Release 1 (SVS) and Release 2 (MVS) operating systems, later used throughout the Multiple Virtual Storage (MVS) architecture and now in z/OS.
In 1972 IBM announced the first release of the OS/VS2 operating system for the IBM System 370 systems; that release later was known as Single Virtual Storage . In 1974 IBM announced release 2.0; that release and all subsequent releases became known as Multiple Virtual Storage . All releases of OS/VS2 were available to no charge because the ...
In the mid-1970s IBM introduced MVS, which not only supported virtual storage that was larger than the available real storage, [NB 2] as did SVS, but also allowed an indefinite number of applications to run in different address spaces. Two concurrent programs might try to access the same virtual memory address, but the virtual memory system ...
Alter the contents of registers or storage of your virtual machine SYStem: Reset or restart your virtual machine or clear storage TAg: Set a tag associated with a spooled device or file. The tag is usually used by VM's Remote Spooling Communications Subystem (RSCS) to identify the destination of a file TERMinal: Set characteristics of your ...
A virtual storage area network (virtual SAN, VSAN or vSAN) is a logical representation of a physical storage area network (SAN). A VSAN abstracts the storage-related operations from the physical storage layer, and provides shared storage access to the applications and virtual machines by combining the servers' local storage over a network into a single or multiple storage pools.
A direct-access storage device (DASD) (pronounced / ˈ d æ z d iː /) is a secondary storage device in which "each physical record has a discrete location and a unique address". The term was coined by IBM to describe devices that allowed random access to data, the main examples being drum memory and hard disk drives . [ 1 ]
The NFL playoff schedule is about to be set, with the wild-card dates and times for every matchup to be revealed during Week 18.
For example, if a file server has a number of hard drives that are only partially filled, file-based virtualization can be used to store files on those drives, thereby increasing the utilization of the storage devices. File-based virtualization can be used to create a virtual file server (or virtual NAS device), which is a storage system that ...