Editing MVS (section)

==Data Facility Product (DFP)==
{{main|Data Facility Storage Management Subsystem (MVS)#DFSMSdfp|label=Data Facility Storage Management Subsystem Data Facility Product(DFSMSdfp)}}
In the late seventies and early eighties IBM announced:

* 5740-AM7 Data Facility Device Support (DF/DS)
* 5740-XYQ Data Facility Extended Function (DF/EF)
* 5740-AM3 Sequential Access Method Extended (SAM-E)
* 5740-AM8 Access Method Services Cryptographic Option
* 5748-UT2 Offline 3800 Utility

DF/DS added new device support, and IBM announced that it would no longer add device support to the free base. DF/EF added the Improved Catalog Structure (ICF) as an alternative to VSAM catalogs and Control Volumes (CVOLs), but it was riddled with reliability problems.

When IBM announced<ref>{{cite web
 |     title = IBM Large Systems Announcement Overview
 |        id = LTR ENUS283-042
 |      date = October 21, 1981
 |       url = https://www.ibm.com/docs/en/announcements/archive/ENUS283-042
 |      type = Announcement letter
 | publisher = IBM
 | access-date = January 19, 2025
 }}
</ref> MVS/SP Version 2 (MVS/XA), it also announced<ref>{{cite web
 |     title = Data Facility Product Release 1
 |        id = LTR ZP81-0798
 |      date = October 21, 1981
 |       url = https://www.ibm.com/docs/en/announcements/archive/ENUSZP81-0798
 |      type = Announcement letter
 | publisher = IBM
 }}
 </ref> Data Facility Product™ (DFP™) as a replacement for and upgrade to the other five products above, which it said would be withdrawn from marketing, effective December 1, 1984. DFP/370 Release 1 (program number 5665-295), announced June 7, 1983, was for MVS/SP Version 1, MVS/SE and OS/VS2 R3.8, and was optional, but MVS/Extended Architecture Data Facility Product (5665-284) was a corequisite for MVS/SP Version 2 (MVS/XA). In addition to enhancing data management facilities, DFP replaced free versions of the linkage editor and utilities.

DFP is no longer available as a separate product, but has become part of [[Data Facility Storage Management Subsystem]], under the name [[Data Facility Storage Management Subsystem (MVS)#DFSMSdfp|DFSMSdfp]].