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Virtual Storage Access Method

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(database)Virtual Storage Access Method - (VSAM) An IBM disk file storage scheme first used in S/370 and virtual storage. VSAM comprises three access methods: Keyed Sequenced Data Set (KSDS), Relative Record Data Set (RRDS), and Entry Sequenced Data Set (ESDS).

Both IMS/DB and DB2 are implemented on top of VSAM and use its underlying data structures.
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Virtual concepts have since been used in many architectures and designs including: Virtual Address Extension (VAX); Virtual Circuit (VC); Virtual Machine (VM); MVS (Multiple Virtual Storage and became OS/390 and now is z/OS); Virtual Memory System (VMS); Virtual Private Network (VPN); Virtual Reality (VR); Virtual Storage Access Method (VSAM); Virtual Storage Extended (VSE; was DOS/VSE); Virtual Tape Subsystem (VTS); and Virtual Telecommunications Access Method (VTAM).
Storage Virtualization--Strategic For SANs by Moore, Fred / Computer Technology Review
 
 
 
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