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78 VM/HSC 6.0 System Programmer’s Guide
1st ed., 6/30/04 - 312579601
Communication Functions
HSC communication functions ensure that passing of pertinent information between HSC
components and hosts is accomplished successfully.
Host-to-Host Communications Services
The HSC permits you to select the hierarchy of methods used for host-to-host
communications. The communications services are designed to provide you with fail-safe
communications between HSC hosts in a data center complex.
Information Passed Between Hosts
The following kind of information is passed between hosts:
• control data set switch information
• CAP status information.
Types of Communications Services
Communications services that are available fall into three categories:
• Telecommunications access method through the ACF/VTAM network – This method
of host-to-host communications provides the highest performance and reliability.
• Communication through the LMU – This method of host-to-host communications is
a lower performance method than ACF/VTAM.
• Communication through the CDS – This method of host-to-host communications is a
lower performance method than either ACF/VTAM or LMU.
Figure 8 illustrates the available communication methods and relative hierarchy of the
methods.
HOST 1
LMU
VTAM
COMMUNICATION
METHOD
HOST n
CDS
HOST 0
HOST 2
C29348
Figure 7. HSC Communication Methods