BigIron RX Installation Guide 11753-1001811-01Managing the cooling system 5Syntax: clear logging [dynamic-buffer | static-buffer]You can specify the dynamic-buffer keyword to clear the dynamic buffer or the static-buffer keywordto clear the static buffer. If you do not specify a buffer, both buffers are cleared.Managing the cooling systemThis section provides configuration, management, and monitoring information about the BigIron RXSeries cooling system.Configuring the cooling systemThe BigIron RX Series switch provides default settings for all cooling system parameters. Therefore,no initial configuration of the cooling system is necessary. If desired, you can change the settings ofthe following cooling system parameters:• Low and high temperature thresholds for modules and fan speeds• Interval at which the system polls the temperature sensors on the module for a readingChanging temperature thresholds for modules and fan speedsThe BigIron RX Series cooling system includes fans that operate at speeds of low, medium,medium-high, and high. In general, each fan speed, except for low, has a low and high temperaturethreshold associated with it as shown in Figure 72. The low fan speed has a high temperaturethreshold only.FIGURE 72 Fan speeds and temperature thresholdsThe low and high temperature thresholds enable the BigIron RX Series system to determine atwhich speed the fans should operate. In general, the fans operate as follows:• If the temperature of all modules falls between the low and high thresholds for a fan speed, thefan continues to operate at that fan speed.• If the temperature of a management module or the switch fabric module or an interfacemodules exceeds the high threshold specified for a fan speed, the fan increases its speed tothe next higher speed. On the cards with two sensors, each is monitored individually and ifeither exceeds the threshold limits, then the fan will increase. If the temperature of any ofthese modules exceeds the high threshold for the high speed for three minutes (the actualnumber of polls is determined by the setting of the temp-poll-period command), the systemshuts down the modules to prevent damage. (For information about temp-poll-periodcommand, refer to “Changing the temperature polling interval” on page 121.)OperatingTemperatureMediumSpeedLow Speed Med-HighSpeedHighSpeed50 55 60 65 70 75 80 85 90 95High, 60 deg.Low 57, deg. High, 70 deg.Low, 67 deg. High, 80 deg.Low, 77 deg. High, 85 deg.
