Operating the Unit
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AM4904 User Guide
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3.4.8 MCH Redundancy Support
The CM can be used in chassis with dual MCH slots. In this configuration, the MCH will detect the presence of
a second MCH.
If both MCH are compatible, they will switch to an active/standby mode, where the standby MCH will con-
stantly monitor the active MCH using redundant communication channels. When it does detect that the
active MCH is no longer responsding, it will initiate a fail-over, will rediscover currently active modules in the
chassis and will take over management of the carrier.
Two independent channels are used for communication. One is the standard redundant backplane IPMB-0.
Any MCH will periodically distribute its status on the bus to the other MCH via a Kontron OEM IPMI command
send to the MCMC. In addition, a heartbeat is sent periodically between both MCHs using a PLD interlink. This
heartbeat is also used to detect health of the other MCH.
When both communication channels indicate a remote failure, the backup MCH may then initiate a failover.
It signals this transition to the active MCH using the PLD interlink. The PLD on the active MCH will then safely
isolate/shutdown external interfaces related to carrier management on the failed MCH.
Redundancy status of the MCH will be shown using the cm command “rm status”. There is also a command
(rm xover reset) that forces the redundant MCH to reset.
For additional information about CM redundance commands, see chapter Redundancy Commands.
3.4.9 Cooling Unit Management
The Carrier Manager implements an intelligent fan control that works together with MicroTCA compliant
Cooling Units that are connected to the IPMB-0 bus.
Once the CM has discovered that the chassis supports cooling units it starts the fan control module. The
fan control module can be forced off if the config parameter fan_control is set to zero.
Содержание AM4904
Страница 19: ...1KTC5520 EATX Chapter 1 Introduction www kontron com...
Страница 24: ...6KTC5520 EATX Chapter 2 Functional Description www kontron com...
Страница 65: ...47KTC5520 EATX Chapter 3 Operating the Unit www kontron com...
Страница 104: ...85KTC5520 EATX Chapter 4 Hardware Installation www kontron com...
Страница 109: ...90KTC5520 EATX Chapter 5 Power Considerations www kontron com...
Страница 113: ...Chapter 6 Thermal Considerations www kontron com...
Страница 121: ...1 Appendix A CM Configuration Options www kontron com...
Страница 128: ...1 Appendix B Getting Help www kontron com...
Страница 131: ...1KTC5520 EATX Appendix C Glossary www kontron com...