IBM 610 Technical Overview And Introduction

Also see for 610: Manual of operation

24 pSeries 610 Models 6C1 and 6E1 Technical Overview and IntroductionSerial port snoopYou can use the serial port snooping at any point after the system is booted to AIX, wheneverthe configured reset string is typed on the main console. The system uses the serviceprocessor reboot policy to restart. This action causes an early power off warning (EPOW) tobe logged, and also an AIX dump to be created if the machine is at an AIX prompt, with AIX insuch a state that it can respond. If AIX cannot respond, the EPOW record is created, ratherthan the AIX dump.This functionality is very useful in the unlikely event of a system hang and you have toadminister a remote server.3.2.3 Hot plug power suppliesThe Models 6C1 and 6E1 adopted Netfinity® 5600 power supplies, which consist of up tothree 250 W units. One system unit requires a minimum of two power supplies for normaloperation. To make your system more reliable, you can hot-plug a third power supply forredundancy. The third power supply is recognized by your system as soon as you plug it in.With three supplies, if one supply fails, you can do a hot-plug replacement without a shutdownof your system.In the unlikely event of one failing power supply (without having the third power supplyinstalled) or two failing power supplies (if you have installed the redundant power supply), asystem shutdown will be initiated by the operating system.3.2.4 Hot plug fansThere are four fans in the Models 6C1 and 6E1. All four fans are hot pluggable. Each fan hasa LED to indicate the state of the fan. The Light Path summary panel also has a status LEDfor each fan. Off means normal operation and solid-on means fault.At power on, in order to maintain a low acoustic level, the speed of the fans is ramped upslowly. The supply voltage of fan 1 and fan 2 is linearly increased from 0V to approximately6.5V whereas the supply voltage of fan 3 and fan 4 is linearly increased from 0V toapproximately 7.5V. All fans will have their LED (both FRU LED and summary panel fan LED)turned off (normal operation) when running. As ambient temperature exceeds 24C, the fanvoltage starts increasing linearly, finally reaching its maximum of approximately 12V at 32C.If one of the four fans fails, the three remaining fans will be placed in the turbo mode (fullspeed) by setting the fan supply voltage to 12V. The failing fan LED (both FRU LED andsummary panel fan LED) must be switched to solid-on state indicating a fault condition. Analert will be send to the operating system that redundant cooling has been lost and a servicecall is needed. The failing fan can be replaced (hot-pluggable) while the system is running.When the failing fan has been replaced and service processor has determined that the newfan operates properly, the fan LED will be switched to off (normal) via the AIX Service Aidmenu and the fan supply voltages will be returned to nominal level.If one fan fails and a second fan runs slow or fails, a system shutdown will be issued to theoperating system.