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Intelligent Chassis Management Bus (ICMB) v1.0 Overview PowerPoint PPT Presentation

Intelligent Chassis Management Bus (ICMB) v1.0 Overview Tom Slaight Server Management Architect Intel Corporation February 24, 1999 Agenda ICMB Overview ICMB Benefits ICMB Architecture Summary and Call to Action ICMB

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Intelligent Chassis Management Bus (ICMB) v1.0 Overview

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Intelligent chassis management bus icmb v1 0 overview l.jpg

Intelligent Chassis Management Bus (ICMB) v1.0 Overview

Tom Slaight

Server Management Architect

Intel Corporation

February 24, 1999


Agenda l.jpg

Agenda

  • ICMB Overview

  • ICMB Benefits

  • ICMB Architecture

  • Summary and Call to Action


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ICMB

Extends IPMI Intelligent Platform Management to multiple host and peripheral chassis

Intelligent

Chassis

Management

Bus

ICMB

ICMB

Bridge

ICMB

Bridge

ICMB

Bridge

ICMB

Bridge

Host

Periph. Chassis

Periph. Chassis

Host

Chassis

Ctrlr.

SEL

Chassis

Ctrlr.

SEL

IPMB

IPMB

SDRs

SDRs

BMC

SEL

BMC

SEL

SDRs

Sensors

Sensors

SDRs

Sensors

Sensors


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ICMBRelationship to IPMI

  • IPMI specifications define a standardized, abstracted, message-based interface to intelligent platform management hardware

  • Including messaging interface and transport specifications:

    • System Interfaces - I/O ports for host s/w access

    • IPMB - I2C-based Intelligent Platform Management Bus for extending and accessing management within a chassis

    • ICMB - For extending platform management between multiple chassis


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PowerControl

Monitoring

Alerting

Recovery

Logging

Inventory

ICMBOrigins

Power

Mid-range

Enterprise

I/O Expansion

Entry

RAID

UPS

Pedestal

Peripheral

Rack Mount

Different chassis - same management needs

Same management needs

Different chassis


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ICMBSolution

  • Bus dedicated to inter-chassis monitoring and management functions.

    • Not a LAN or peripheral bus substitute.

  • Complementary to in-band chassis management interfaces such asSAF-TE* and SES*

    • Adds manageability when in-band mechanisms are inaccessible

* SAF-TE: SCSI Accessed Fault-Tolerant Enclosures specification. Copyright Intel, nStor

SES: SCSI Enclosure Services specification. Copyright ANSI Third-party marks and brands are the property of their respective owners.


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Agenda

  • IPMI Update

  • ICMB Overview

  • ICMB Benefits

  • ICMB Architecture

  • Summary and Call to Action


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ICMB Benefits

Software

Hardware

System


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ICMB BenefitsSoftware

  • Uses IPMI commands, abstraction, and data structures

    • Preserves developer knowledge

  • Supports software auto-configuration

    • Sensor Data Records make each chassis self-descriptive

  • Flexible configuration

    • Sensor Data Records allow sensor population and thresholds to be changeable without firmware modification


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ICMB BenefitsSoftware

  • Provides common chassis management

    • Power control, health sensors, inventory information and events

  • Enables mixed chassis management

    • Same system management software can manage variety of chassis types


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ICMB BenefitsSoftware

  • Enables common in-band and out-of-band management

    • System management software uses same IPMI commands via ICMB or in-band interface

    • Allows re-use of in-band software modules for out-of-band access

  • Supports OEM Differentiation

    • Inherits IPMI support for OEM commands, OEM sensor types, and OEM events


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ICMB BenefitsHardware

  • Flexible

    • Can be integrated into management controller

    • Can be added on to existing IPMI-based system

  • Scalable

    • Chassis contain their own SDRs and System Event Logs


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ICMB BenefitsHardware

  • Hot- Plug ‘N play

    • Chassis can be disconnected from AC power at any time

    • Chassis can be added or removed from bus at any time

  • Automatic address resolution

    • no address configuration software or switches required

Extensible and Serviceable


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ICMB BenefitsHardware

  • Low-cost - designed for standard microcontrollers

    • Single RS-485 transceiver per node

    • Uses micro’s internal Serial Controller

  • Easy interconnect

    • Passive bus, no terminators required

    • supports daisy chain, passive star,and multi-drop cabling topologies

Uses ‘Off-the-shelf’ Components


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ICMBSystem

Provides always available monitoring and control

  • Health status, power and reset control, and inventory access with system powered up, powered down, or in a ‘sleep’ state

  • Independent of host processor and operating software state


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ICMB BenefitsSystem

  • Enables ‘Buddy Management’ for enhanced system RAS

    • Systems watch each other for fail over alerting and cluster platform management

  • Enables mixed-OS platform management

    • One computer can monitor the platform health of another - independent of the other system’s OS.


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ICMB BenefitsSystem

Enables EMC Sharing

Multiple chassis managed by single Emergency Management Card

PhoneLine

ICMB

EMC

ICMB

Bridge

ICMB

Bridge

ICMB

Bridge

Host

Host

Host

IPMB

IPMB

IPMB

BMC

BMC

BMC


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Agenda

  • ICMB Overview

  • ICMB Benefits

  • ICMB Architecture

  • Summary and Call to Action


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ICMB ArchitectureGeneral Specifications

  • 19.2 Kbps RS-485 serial

    • protocol and event policy keep message traffic and bus occupancy low

  • Electrical support for at least 64 chassis

  • 16-bit source and destination addressing

  • Support for 600’, min, of overall interconnection

  • Six-pin ‘Semcon’ and keyed RJ-45 connector options.

Platform Management Focused


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ICMB ArchitectureAdd-on ICMB Bridge

ICMB

ICMB

Bridge

Controller

RAID Backplane

Aux. IPMB

Baseboard

IPMB

Chassis

Mgmt.

Controller

SEL

SDRs

FRU

Baseboard

Mgmt.

Controller

Monitoring

& control

circuitry

Chassis

Sensors

System Interface

FRU SEEPROM

System Bus

IPMI Messages


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ICMB ArchitectureIntegrated ICMB Bridge

ICMB

ChassisMgmt. Bd.

IPMI Messages

ICMB

Bridge

VirtualIPMB

SEL

SDRs

FRU

Chassis

Mgmt.

Control

Drive

Slot Status

SAF-TE Commands

SCSI Interface

SCSI BUS


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ICMB ArchitectureMessaging

  • Based on IPMB Protocol

    • Request/Response protocol for multi-master and bridging support

    • Sequence number and retries for discovery and robustness

  • Plus transport extensions for hot-plug connectivity:

DataIntegrity

Arbitration

Address

Resolution

Discovery

EventMessages


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ICMB ArchitectureData Integrity

DataIntegrity

  • 16-bit ‘sum to FFFFh’ checksum with data length adder

  • Retries supported via Sequence Number

    • Sequence number differentiates a new request from a retry

    • Sequence number also matches responses to requests across bridge


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ICMB ArchitectureAddress Resolution

Address

Resolution

Bridges test for address already in use on power-up

  • Automatically select new address if conflict detected

  • Continue to monitor during runtime

    • monitor and re-enter assignment state on runtime conflict


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ICMB ArchitectureArbitration

Arbitration

  • ‘Bit banged’ arbitration pulse

    • Pulse position and width determine winner

    • Low probability of collision based on arbitration and bus usage

    • Data integrity checks and retries handle collisions

  • Timing compatible with low-cost micros


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ICMB ArchitectureDiscovery

Discovery

Driven by system management software

  • S/W broadcasts‘Get ICMB Addresses’ command

  • S/W collects set of bridge addresses and sets a ‘discovered’ state to individual bridges

    • Discovered bridges do not respond to further ‘Get ICMB Addresses’ commands

  • Process repeats until all bridges discovered


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ICMB ArchitectureEvent Messages

Event

Messages

  • Broadcast Event Messages provide scalability and fail-over support

    • Directed event messages supported for development and test

  • ‘Chassis Online’ event

    • Chassis periodically announce themselves while waiting for discovery by sending

  • ‘Attention’ event

    • Sent on new events in SEL or power-state change


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DataIntegrity

Address

Resolution

Discovery

EventMessages

Arbitration

ICMB ArchitectureBrings it altogether...

DataIntegrity

IPMI

Commands &

Data Structures

Address

Resolution

Discovery

EventMessages

Arbitration


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Agenda

  • ICMB Overview

  • ICMB Benefits

  • ICMB Architecture

  • Summary and Call to Action


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Summary

  • IPMI provides the foundation for new out-of-band management features

  • ICMB provides a common interface for enhanced inter-chassis management

  • ICMB provides always accessible chassis management

  • ICMB is simple, cost-effective, and scalable


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