NAT-MCH Users Manual Version 1.16

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NAT-MCH – Users Manual 4.3.1 Sensor Event Log The MCH provides a System Event Log (SEL) that stores all events that occur in a uTCA system. The stored events are kept in the MCH’s DRAM and are note stored into persistent memory. Events can be read by an application using the IPMI message GET_SEL_ENTRY_REQ. In the MCH’s default configuration events are removed from the SEL on read. Keeping events in the SEL after reading them can be configured using the MCH configuration menu (refer to chapter 5). To remove single events from the SEL in this configuration IPMI message DELETE_SEL_ENTRY_REQ has to be sent to the MCH, to clear the whole SEL IPMI message CLEAR_SEL_REQ has to be sent to the MCH. Please note that some events (e.g. temperature events) are handled by the local shelf manager (refer to chapter 4.3.2). 4.3.2 Temperature Management The local shelf manager receives temperature events from following sources • Local temperature sensors on the MCH • Temperature sensors on the AMC modules • Temperature sensors on Cooling Units and Power Modules In case the MCH receives a temperature event (temperature going high event) from a FRU, i.e. the temperature of a certain module has reached a critical level, it increases the fan speed of the cooling units to the maximum level and starts monitoring the temperature sensors of the respective FRU. As soon as the temperature returns to normal level the fan speed will be decreased to a level which is 10% higher than the level it was when the temperature event occurs. The initial normal fan level can be set in the MCH configuration menu by the value of the configuration parameter: Within the MCH global parameter section 4.4 NAT-MCHs operating with unmanaged Power Modules The NAT-MCH is capable to manage systems which use so called “power through” modules. In this case the detection of modules is not done by the power modules (i.e. presence of #PS1 signal), but the NAT-MCH itself starts scanning all AMC slots by IPMI messages. Of course, Version 1.16 © N.A.T. GmbH 28
NAT-MCH – Users Manual due to the limited functionality of such a power module, functionalities like power sequencing and hot swap are not available. Version 1.16 © N.A.T. GmbH 29
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NAT-MCH Users Manual Version 1.16

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