Page of GC20-1801-10 As Updated March 3, 1980 by TNL GN25-0776
Planning Considerations for Other Virtual Machines
System/370 VMl RSCS I I Control Proqram of VM/370 Virtual Virtual Virtual 2703 2703
2703 I I I Real 3705 (in 2703 EP Mode) I I j Data Data Data
Set Set Set J. .L 1 T T T
Data Data Data
Set Set Set I I I 3780
System/3
as/HASP
Processor
Figure 4. A Remote Spooling Communications Subsystem When you code the GENLINK macros during the RSCS generation
procedure, you must code the local location identification on the first
GENLINK macro.
Information about generating and installing RSCS is in "Part 3.
Generating VM/370 (CP, CMS, RSCS and IPcs).n VM/370 Using Channel Switching
The two-or
environments:
four-channel switch can be used in the following Two processors, one running VM/370 and the other running an operating
system that supports channel switching. I. Two virtual machines running under VM/370; each virtual machine I operating system must support the channel switch feature (eMS does I not).
42 IBM VM/370 Planning and System Generation Guide
Page of GC20-1801-10 As Updated March 3, 1980 by TNL GN25-0776
Planning Considerations for Other Virtual Machines I. A single virtual machine running under VM/370; the virtual machine I operating system must support the channel switch feature. I. A processor running VM/370 and managing multiple paths to devices I through the VM/370 alternate path support. Refer to the section on I "Alternate Path Support" in this document for a discussion on the I VM/370 alternate path support. You can use the two-or four-channel switch for
two processors. For example, one processor could be
the ether could be running as as shown in Figure 5. PROC 1 ,..-----, I I I as l- I I '-- __ --l ------------------
devices attached to
running VM/370 and I 2 f , I I ,290- 2 97 I Channel I I I I I 390-397 Switch , I I I I , I I I I , L-r----..&.--- ____ _____ _J I PROC2 I r-------, I I I I I VM/3701----------J I I '--------' Figure 5. Channel Switching between Two Processors VM/370 requires the following RDEVICE and RCTLUNIT macros to support
this configuration: RDEVICE ADDRESS=(290,8),DEVTYPE=3330 RDEVICE ADDRESS=(390,8) ,DEVTYPE=3330 RCTLUNIT ADDRESS=290,CUTIPE=3830 RCTLUNIT ADDRESS=390,CUTYPE=3830 These macros make it possible for you to run VM/370 on PROC1 or PROC2. If you are always going to run VM/370 on PROC2, you can eliminate one
path (eliminate one set of RDEVICE and RCTLUNIT macros). Part 1. Planning for System Generation 43
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