Foundry FastIron SuperX, Руководство по установке оборудования

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FastIron Hardware Installation Guide for the FSX, FSX 800, and FSX 1600
5 - 10 © 2008 Foundry Networks, Inc. December 2008
All thermal planes, along with temperature thresholds, help determine at which speed the fans should operate.
For each thermal plane, you can define separate temperature thresholds for fan speeds. Each thermal plane can
have different temperature thresholds.
For each thermal plane, the Foundry device records the highest temperature based on the temperature reading of
all of the modules in the thermal plane. The highest temperature recording applies to releases 03.0.00 and later.
In releases prior to 03.0.00, the Foundry device records the average temperature reading of all of the modules in
each thermal plane. The system uses this information and the current configured temperature thresholds to
adjust the fan speed. You can view the temperature of each thermal plane using the
show chassis command.
Fan Speed Modes
The fans can operate in automatic or manual mode. The default is automatic mode. This section describes both
methods.
Automatic Mode
By default, the fans operate in automatic mode, self-adjusting their speed based on both of the following factors:
• the current temperature of each thermal plane
• the current configured temperature threshold ranges for all five fan speeds
The Foundry device has default temperature threshold ranges for fan speeds (Table 5.2). If desired, you can
change these settings.
The software regularly polls the chassis to obtain the temperature of each thermal plane, then uses this
information to decide whether or not to switch the fan speed. By default, the Foundry device polls the chassis
every 60 seconds for temperature data. You can change this interval using the CLI command
chassis poll-time .
If the temperature of a thermal plane exceeds the high temperature level of the temperature range associated with
the current fan speed in the associated plane, the system will switch the fan speed to the next higher level. For
example, let’s say the current fan speed is 3 (medium), and the configured operating temperature range for fan
speed 3 is 40 to 50 degrees Centigrade for Thermal Plane 2. Based on this configuration, if the temperature of
Thermal Plane 2 rises to 51 degrees Centigrade, the system will automatically increase the fan speed to fan speed
4.
Manual Mode
Typically, the fans operate in automatic mode, as described above. If desired, you can manually set the speed at
which the fans will operate. For more information, see “Manually Setting the Fan Speed” on page 5-19.
Changing Temperature Thresholds For Thermal Planes and Fan Speeds on the FSX (pre-
release 03.0.00 only), and on the FSX 1600
NOTE: This section applies to the FSX running pre-release 03.0.00 software, and to the FSX 1600. For the FSX
and FSX 800 running releases 03.0.00 and later, see “Changing Temperature Thresholds For Thermal Planes and
Fan Speeds (Releases 03.0.00 and Later)” on page 5-14.
The FSX and FSX 1600 cooling system includes six five-speed fans. The fans operate at speeds of low, medium-
low, medium, medium-high, and high. In general, each fan speed, except for low, has a low and high temperature
threshold associated with it as shown in Figure 5.1. The low fan speed has a high temperature threshold only.