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OS/390 through cross-domain resource definitions. They are also
useful for data transfer via NetView FTP or NJE. OSA (Open System
Adapters) are often the most economical solution.
You will want access to other devices in your installation. They can be
switchable or connected via a common local area network (LAN). See the
OS/390 MVS Recovery and Reconfiguration Guide
, GC28-1777 for more
configuration planning information.
25.2.5 Inter-Systems Connectivity
You will need to share files and I/O devices between your VSE system and the
new OS/390 system. Users on the new OS/390 system need access to data and
resources such as printers and interactive terminals on your existing VSE
system, and VSE users need to send programs and data over to the new system
for migration and testing.
25.2.5.1 Shared DASD
It is both difficult and dangerous to share DASD between VSE and OS/390
systems. Difficult because they don′t support the same file organizations.
Dangerous because there is no serialization mechanism to prevent multiple
updates or data corruption from occurring.
However, under strict manual controls (for example, vary online/offline) you can
set up some common DASD for sharing data and programs between your VSE
and OS/390 systems. This way, you can avoid an intermediate transfer of the
data to tape or sending it via communication mechanisms such as NetView FTP.
Since VSE doesn′t support indexed VTOCs, a volume with an indexed VTOC
must be converted to a non-indexed VTOC (OS VTOC) before transporting it to
the VSE system. Chapter 5, “Disk and Tape Storage Considerations” on page 97
chapter has more information about DASD sharing.
25.2.5.2 Tape Drives
You will need some tape drives to transfer large amounts of data between the
two systems. They can be switched between the two systems, although you
probably will want to dedicate at least two tape drives to the OS/390 system.
25.2.5.3 Terminal Access
You will need to provide terminal access for TSO users on your new system.
This can be done in several different ways:
•
Dedicate terminal controller to the OS/390 system.
•
SNA cross-domain logon from your existing terminals on your VSE system
using VTAM-controlled CTCs
•
SNA cross-domain logon through a Communications Controllers (for
example, 3745) shared with your VSE system using multiple channel
adapters or EMIF.
•
Use a Token-Ring network shared with the VSE system, and an OSA (Open
System Adapter) on the new processor.
See 25.5.1.3, “Providing Terminal Access to the OS/390 System” on page 414.
404 VSE to OS/390 Migration Workbook