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2. Virtual Storage Access Method - Wikipedia

   en.wikipedia.org/wiki/Virtual_storage_access_method

   An IBM Redbook named "VSAM PRIMER" (especially when used with the "Virtual Storage Access Method (VSAM) Options for Advanced Applications" manual) explains the concepts needed to make use of VSAM. [3] IBM uses the term data set in official documentation as a synonym for file, and direct-access storage device (DASD) for devices with random ...

3. Support programs for OS/360 and successors - Wikipedia

   en.wikipedia.org/wiki/Support_programs_for_OS/...

   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 ...

4. Data Facility Storage Management Subsystem (MVS) - Wikipedia

   en.wikipedia.org/wiki/Data_Facility_Storage...

   While DFSMS/MVS Release 1 still included ISAM, IBM eventually dropped it, but continued to support the ISAM compatibility interface to VSAM. DFSMS/MVS R1 included the optional Removeable Media Manager (DFSMSrmm), which supports both manual tape libraries and the 3495 [ 11 ] Tape Library Dataserver.

5. MVS - Wikipedia

   en.wikipedia.org/wiki/MVS

   These VSAM formats became the basis of IBM's database management systems, IMS/VS and DB2 - usually ESDS for the actual data storage and KSDS for indexes. VSAM also included a catalog component used for user catalogs and MVS' master catalog.

6. Entry-sequenced data set - Wikipedia

   en.wikipedia.org/wiki/Entry-sequenced_data_set

   An entry-sequenced data set (ESDS) is a type of data set used by IBM's VSAM computer data storage system. [1]: 5 Records are accessed based on their sequential order, that is, the order in which they were written to the file; which means that accessing a particular record involves searching all the records sequentially until it is located, or by using a relative physical address (Relative byte ...

7. Direct-access storage device - Wikipedia

   en.wikipedia.org/wiki/Direct-access_storage_device

   An early public use of the acronym DASD is in IBM's March 1966 manual, "Data File Handbook. [7]" The earliest non-IBM use of the acronym DASD found by the "Google ngram viewer" to refer to storage devices dates from 1968. [8] From then on use of the term grew exponentially until 1990 after which its usage declined substantially. [9]