StorageTek 6 manual Communication Functions, Host-to-HostCommunications Services

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 0

COMMUNICATION

METHOD

VTAM

LMU

HOST 2

CDS

HOST 1

HOST n

C29348

Figure 7. HSC Communication Methods

78VM/HSC 6.0 System Programmer’s Guide

1st ed., 6/30/04 - 312579601