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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.
5740-AM3 Sequential Access Method Extended (SAM-E) SAM-E improves the performance of BPAM, BSAM and QSAM on direct access storage devices. 5740-AM8 Access Method Services Cryptographic Option 5748-UT2 Offline 3800 Utility. In June 1980, IBM announced MVS/System Product (MVS/SP) as a replacement for MVS/SE.
IDCAMS ("Access Method Services") generates and modifies Virtual Storage Access Method (VSAM) and Non-VSAM datasets. IDCAMS was introduced along with VSAM in OS/VS; the "Access Method" reference derives from the initial "VSAM replaces all other access methods" mindset of OS/VS. IDCAMS probably has the most functionality of all the utility ...
VPN—Virtual Private Network; VPS—Virtual Private Server; VPU—Visual Processing Unit; VR—Virtual Reality; VRML—Virtual Reality Modeling Language; VSAM—Virtual Storage-Access Method; VSAT—Very Small Aperture Terminal; VT—Video Terminal; VTL—Virtual Tape Library; VTAM—Virtual Telecommunications Access Method; VRAM—Video ...
MVS/XA, or Multiple Virtual Storage/Extended Architecture, was a version of MVS that supported the 370-XA architecture, which had a new I/O architecture and also expanded addresses from 24 bits to 31 bits, providing a 2 gigabyte addressable memory area. [9]
An access method is a function of a mainframe operating system that enables access to data on disk, tape or other external devices. Access methods were present in several mainframe operating systems since the late 1950s, under a variety of names; the name access method was introduced in 1963 in the IBM OS/360 operating system. [ 1 ]
The Pasadena Jewish Temple & Center burns during the Eaton fire in Pasadena, CA, on Jan. 7, 2025. A ferocious wildfire in a Los Angeles suburb devoured buildings and sparked panicked evacuations ...
One common method to address these limits is to use multiple levels of virtualization. In several storage systems deployed today, it is common to utilize three layers of virtualization. [4] Some implementations do not use a mapping table, and instead calculate locations using an algorithm. These implementations utilize dynamic methods to ...