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GC26-3784-5
File No. 5370-36
Systems OS/VS Checkpointl Restart
VS1 Release 4
VS2 Release 3
Sixth Edition (February 1975)
This edition replaces the two previous editions (numbered GC26-3784-3 and GC26-3784-4)
and the associated technical newsletter (numbered GN26-0773) and makes them all
obsolete.
This edition applies both to Release 4 of OS/VS 1 and to Release 3 of OS/VS2, and to all
subsequent releases of either system unless otherwise indicated in new editions or technical
newsletters. (Information on enhanced VSAM under OS/VS2 is only for planning
purposes until the availability of the OS/VS VSAM Independent Component Release for
Release 3 of that system. Information on the Mass Storage System is only for planning
purposes until the availability of that product.)
Significant system changes are summarized under "OS/VSl Summary of Amendments" or
"OS/VS2 Summary of Amendments" following the list of figures. In addition,
miscellaneous editorial and technical changes applicable to either or both of OS/VS 1 and
OS/VS2 have been made throughout the publication. Each technical change is marked by
a vertical line to the left of the change.
The "Storage Estimates" chapter previously in this pUblication has been deleted. That
information is now included under the "Introduction" chapter. Additional information on
storage estimates can be found in OS/VSJ Storage Estimates, GC24-5094, and OS/VS2
System Programming Library: Storage Estimates, GC28-0604. The "Cautions,"
"Repositioning User Data Sets," and "Preserving Data Set Contents" sections in the
"User Data Sets" chapter have been reorganized.
Information in this pUblication is subject to significant change. Any such changes will be
published in new editions or technical newsletters. Before using the publication, consult the
latest Virtual Storage Supplement (to IBM System/360 and System/370 Bibliography),
GC20-000l, and the technical newsletters that amend the bibliography, to learn which
editions and technical newsletters are applicable and current.
Requests for copies of IBM publications should be made to the IBM branch office that
serves you.
Forms for readers' comments are provided at the back of the publication. If the forms have
been removed, comments may be addressed to IBM Corporation, System Development
Division, LDF Publishing-Department J04, 1501 California Avenue, Palo Alto,
California 94304. All comments and suggestions become the property of IBM.