Data Facility Storage Management Subsystem (MVS)#ICF catalog

{{expand section|date=August 2021}}

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 (SVS). In 1974 IBM announced release 2.0; that release and all subsequent releases became known as Multiple Virtual Storage (MVS). All releases of OS/VS2 were available to no charge because the software cost was bundled with the hardware cost. OS/VS2 Release 3.8 was the last free release of MVS.

In the late seventies and early eighties IBM announced:

; 5740-XE1 MVS/System Extensions (MVS/SE)

: MVS/SE improves the performance and RAS of OS/VS2 (MVS)

; 5740-AM6 Data Facility Device Support (DFDS) for OS/VS1

; 5740-AM7 Data Facility Device Support (DFDS) for MVS

: DFDS supports an indexed VTOC, and with the proper PTF supports the Speed Matching Buffer on the IBM 3880.

; 5740-XYQ Data Facility Extended Function (DFEF)

: DFEF offers a new type of VSAM catalog, but had reliability problems that were only resolved in DFP.

; 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.

On October 21, 1981, IBM announced{{cite web

| title = 3081 Processor Complex Models K16, K24 and K32 - New System/370 Extended Architecture (370-XA) Added to 3081

| id = ZG81-0263

| date = October 21, 1981

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/3/877/ENUSZG81-0263/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

new Kxx models of the 3081, supporting a new architecture known as System/370 Extended Architecture (370-XA).

IBM also announced{{cite web

| title = MVS/XA System Overview - New Levels of System Function Provided by MVS/Extended Architecture (XA)

| id = LTR ZP81-0789

| date = October 21, 1981

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/9/877/ENUSZP81-0789/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

MVS/Extended Architecture (MVS/XA), consisting of MVS/SP Version 2{{cite web

| title = System/370 Extended Architecture Supported by MVS/System Product Version 2

| id = LTR ZP81-0794

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/877/ENUSZP81-0794/index.html&request_locale=en

| type = Announcement Letter

| date = 9 December 1981

| website = IBM

}}

and a corequisite new product, Data Facility Product{{cite web

| title = Data Facility Product Release 1

| id = LTR ZP81-0798

| date = October 21, 1981

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/8/877/ENUSZP81-0798/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

(DFP), 5665-284, replacing{{efn|name=supd}} five of the products listed above, the linkage editor and the loader.

On May 17, 1983, IBM announced{{cite web

| title = MVS/370 Data Facility Product

| id = LTR 283-141

| date = May 17, 1983

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/1/897/ENUS283-141/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

MVS/370 Data Facility Product (MVS/370 DFP), 5665-295, for MVS/SP Version 1 Release 3, replacing{{efn|name=supd}} the same five programs as DFP for MVS/XA.

On February 5, 1985, IBM announced{{cite web

| title = Multiple Virtual Storage Extended Architecture (MVS/XA) Data Facility Product (DFP) Version 2 Release 1

| id = LTR 285-030

| date = February 5, 1985

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/0/897/ENUS285-030/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

MVS/XA Data Facility Product (MVS/XA DFP) Version 2, 5655-XA2, as a replacement for MVS/XA Data Facility Product Version 1, 5665-284.

DFP replaced BDAM, BPAM, BSAM, ISAM, QSAM and VSAM.

On February 15, 1988 IBM announced{{cite web

| title = Enterprise Systems Architecture/370 and MVS System Product Version 3

| id = LTR 288-059

| date = February 15, 1988

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/9/897/ENUS288-059/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

MVS/System Product Version 3 (MVS/ESA), it also announced{{cite web

| title = MVS/Data Facility Product (MVS/DFP), Version 3

| id = LTR 288-060

| date = February 15, 1988

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/0/897/ENUS288-060/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

MVS/Data Facility Product Version 3 (MVS/DFP), 5665-XA3; MVS/SP V3 required either MVS/XA Data Facility Product Version 2, 5655-XA2, or Version 3. More recent releases were corequisites for MVS/ESA SP Version 4 and MVS/ESA SP Version 5.

On April 19, 1988, IBM announced{{cite web

| title = Data Facility Storage Management Subsystem Overview

| id = LTR 288-200

| date = April 19, 1988

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/0/897/ENUS288-200/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

the umbrella term Data Facility Storage Management Subsystem for facilities provided by the programs

• IBM MVS/Data Facility Product (MVS/DFP) Version 3 Release 1.0
• IBM Data Facility Data Set Services{{efn|DSS cannot read dumps produced by IEHDASDR or by 5740-UT1, Direct Access Storage Dump Restore (DASDR).}} (DFDSS) Version 2 Release 4.0
• IBM Data Facility Hierarchical Storage Manager (DFHSM) Version 2 Release 4.0
• IBM Resource Access Control Facility (RACF) Release 8.1
• IBM Data Facility Sort (DFSORT) Release 10.0

In addition to replacing part of the device support in the base MVS/SP, DFP replaces the Linkage Editor and several utility programs and service aids.

DFP is no longer available as a separate product, but has become part of Data Facility Storage Management Subsystem, under the name DFSMSdfp.

On May 19, 1992, IBM announced{{cite web

| title = IBM DFSMS/MVS Version 1 Release 1

| id = LTR 292-260

| date = May 19, 1992

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/0/897/ENUS292-260/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

DFSMS/MVS, 5695-DF1, replacing MVS/Data Facility Product (MVS/DFP) Version 3, 5665-XA3,

Data Facility Hierarchical Storage Manager (DFHSM) Version 2, 5665-329

and Data Facility Data Set Services (DFDSS) Version 2, 5665-327.

DFSMS/MVS also replaced utilities and service aids.

DSDSS and DFHSM became optional chargeable features of DFSMS; DFSORT and RACF remained separate products.

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{{cite web

| title = IBM 3495 Tape Library Dataserver and IBM 3490 Library Attachment

| id = LTR 192-124

| date = May 19, 1992

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/897/ENUS192-124/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

Tape Library Dataserver.

On March 1, 1994, IBM announced{{cite web

| title = IBM DFSMS/MVS Version 1 Release 2

| id = LTR ZP94-0202

| date = March 1, 1994

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/2/877/ENUSZP94-0202/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

DFSMS/MVS Release 2.

On March 1, 1994, IBM announced{{cite web

| title = IBM DFSMS/MVS Version 1 Release 3

| id = LTR AZ5=607

| date = May 30, 1995

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/7/649/ENUSA95-607/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

DFSMS/MVS Release 3.

On March 1, 1994, IBM announced{{cite web

| title = IBM DFSMS/MVS Version 1 Release 4

| id = LTR 296-347

| date = September 10, 1996

| url = https://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/7/897/ENUS296-347/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

DFSMS/MVS Release 4.

On March 1, 1994, IBM announced{{cite web

| title = IBM DFSMS/MVS Version 1 Release 5

| id = LTR A97-0608

| date = June 9, 1997

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/8/649/ENUSA97-0608/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

DFSMS/MVS Release 5.

{{expand section|date=August 2021}}

This section describes features of DFSMS from the perspective of z/OS; it does not distinguish between features added

by, e.g., DFDS, and features added in the latest release of z/OS.

DFSMSdss{{efn|Originally a separate product called Data Facility Data Set Services (DFDSS), 5740-UT3.}} is a chargeable feature of DFSMS that can dump and restore selected data sets and selected volumes based on specifications in control statements. It is also referred to in documentation as a data mover. DSS replaces the older DASDR and the dump/restore facilities of IEHDASDR, although the dump formats are not compatible.

DFSMSdfp{{efn|Originally called Data Facility Product.}} replaces the older direct, index and sequential access methods, the utilities and service aids, the linkage editor, the loader and program fetch. It is the component to which new device support code is added.

DFSMSdfp adds a number of loosely related facilities.

The VTOC structure inherited from OS/360 uses records with 44 byte keys, and a sequential search using a Search Key Equal/TIC *-8 loop. The VTOC Index (VTOCIX) is an optional data set that indexes Data Set Control Blocks (DSCBs) and allows a faster search.

{{expand section|date=August 2021}}

The Improved Catalog Facility (ICF) replaces the OS/360 Control Volume (CVOL) and the VSAM catalog with a more resilient catalog structure.

{{expand section|date=August 2021}}

Partitoned Data Set Extended (PDSE) is a new type of dataset that resolves several issues with the old PDS organization but that can be read and written by existing BPAM, BSAM and QSAM code.

{{expand section|date=August 2021}}

System Managed Storage (SMS) is a set of facilities for controlling the placement, migration and retention of datasets on direct access storage devices that is more flexible than older methods, e.g., VOL=SER specifications in JCL. Prior to SMS, the installations defined unit names during system generation,{{efn|Eventually IBM replaced the sysgenn method of defining device names with the new MVSCP and HCD programs.}} and two pools of DASD volumes, called PUBLIC and STORAGE, in a member of the system

parameter library. In addition, users had to explicitly define

characteristics of new datasets.

With SMS, an installation can define and update several types of lists, described{{cite book

| title = z/OS 2.5 DFSMS Introduction

| id = SC23-6851-50

| date = September 30, 2021

| section = SMS Classes and Groups

| section-url = https://www.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R5sc236851/$file/idag200_v2r5.pdf#page=34

| pages = 18–21

| url = https://www.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R5sc236851/$file/idag200_v2r5.pdf

| publisher = IBM

}}

by IBM as

;Data Class

:Data definition parameters

;Storage Class

:Availability and accessibility requirements

;Management Class

:Data migration, backup, and retention attributes

;Storage Group

:List of storage volumes with common properties

;Aggregate Group

:Backup or recovery of all data sets in a group in a single operation

;Copy Pool

The installation can also define automatic class selection (ACS) rules that can test, e.g., data set name, and select list names based on installation policies and user requests. A common scenario is for the installation to write a storage group ACS routine to ignore any UNIT parameter and to select the storage group, and to write a DATACLASS ACS rule to assign a dataclass that has default DCB parameters, with both making decisions based on the data set name.

When SMS is active, several new parameters are available in dynamic allocation and the DD JCL statement, e.g., DSNTYPE.

The Binder is a program similar to the linkage editor that can also manage program objects on a PDSE library.

{{expand section|date=August 2021}}

DFSMSdfp provides facilities for using several different protocols to duplicate or mirror DASD volumes to a remote location.

Object Access Method{{cite web

| title = IBM MVS/Data Facility Product (MVS/DFP) Version 3 - Object Access Method

| id = LTR 288-340

| date = June 28, 1988

| url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/0/897/ENUS288-340/index.html&request_locale=en

| type = Announcement Letter

| website = IBM

}}

(OAM) maintains a library of unstructured objects. Such objects are sometimes referred to as BLOBs.

{{main|DFSORT}}

DFSORT is a sort/merge utility that is part of the DFSMS family but not part of the DFSMS/MVS product.

{{main|Hierarchical storage management}}

DFSMShsm, originally Hierarchical Storage Manager (HSM), 5740-XRB, and later Data Facility Hierarchical Storage Manager Version 2 (DFHSM), 5665-329, before becoming an optional component of DFSMS, is a utility for archiving and retrieving datasets. It migrates data from faster storage to less expensive storage, either based on time stamps or explicit requests. It uses DFSMSdss as a data mover.

{{main|Resource Access Control Facility}}

RACF is a security program that is part of the DFSMS family but not part of the DFSMS/MVS product.

It includes an API called SAF that allows applications to do authentication and to check access privileges, and also includes an interface to LDAP.

The Removable Media Manager (DFSMSrmm) controls libraries of tapes, whether manually mounted on tape drive or stored in an automated tape library.

{{notelist|refs=

{{efn

|DFP replace these products in their entirety

• 5740-AM7 Data Facility Device Support (DFDS)
• 5740-XYQ Data Facility Extended Function (DFEF)
• 5740-AM3 Sequential Access Method Extended (SAM-E)
• 5740-AM8 Access Method Services Cryptographic Option
• 5748-UT2 Offline 3800 Utility

|name=supd}}

}}

{{reflist}}

Category:IBM mainframe operating systems