SPI Common Extensions Manual

SPI Common Extensions Manual—427508-001

About This Manual

This manual describes an extended SPI subsystem management interface that

extends the basic SPI protocol described in the

SPI Programming Manual

(formerly the

Distributed Systems Management (DSM) Programming Manual

Audience

This manual is written for those who maintain or develop programs that communicate

using the extended SPI and for anyone interested in the contents of SPI messages.

Extended SPI is used by many NonStop Kernel subsystems, including most NonStop

Kernel communications subsystems and by customer-developed applications that

manage these subsystems.

Section Description

Section 1, Introduction to SPI

Extensions

Reviews basic SPI and summarizes the common

extensions to SPI

Section 2, Extended SPI Concepts

Presents the concepts that extend SPI beyond the

basic interface described in the

SPI Programming

Manual

Section 3, Subsystem Control Point Describes the role of the Subsystem Control Point

(SCP) process

Section 4, ZCOM Data Definitions

Describes ZCOM tokens and other data items used

in extended SPI messages

Section 5, Commands and

Responses

Describes a common set of commands that

management applications use to control or retrieve

information about subsystem objects

Section 6, ZCOM Event Messages

Describes a common set of events defined by ZCOM

Appendix A, ZCOM Errors

Describes ZCOM-defined errors that can be reported

by subsystems that implement the extended interface

Appendix B, ZCMK Definitions

Describes data definitions, events, and errors used

by subsystems that have adopted the ZCMK

implementation of the extended SPI interface

Appendix C, ZCDG Definitions

Describes common events and related data

definitions defined by ZCDG and reported by

diagnostic processes that monitor communications

hardware