The Sun Blade 8000 Series uses front-to-back forced air cooling. Chassis airflow is 1500 cfm.
Sun Blade 8000 Chassis:
Three front fan modules cool the PCI Express ExpressModules.
Nine rear fan modules cool the Sun Blade Server Modules (blades).
Six fans integrated in the power supply modules cool the power supplies, Network Express Modules, and Chassis Monitoring Modules.
Sun Blade 8000 P Chassis:
Nine rear fan modules cool the Sun Blade Server Modules (blades).
Four fans integrated in the power supply modules cool the power supplies, Network Express Modules, and Chassis Monitoring Modules.
The power supply modules fans obtain power from the system-wide power supply. Therefore, the power supply fans keep running even if the power supply fails or is off. The nine rear fan modules contain two independent fans. Should one of the independent fans fail, the remaining fan continues to provide cooling to the blades until the whole fan module is replaced.
Fault management software on the CMM can detect when a front or rear fan's tachometer is out of range. For information about the actions taken in response to a fan fault, see Fan Faults.
There are three front fan modules in the Sun Blade 8000 Chassis that cool the ExpressModules. The chassis can run indefinitely with one failed front fan. However, if two or three fans fail, or if you remove two or all three fans, the chassis will shut down after one minute. Each front fan module has a set of three LED indicators: Ready-to-Remove (blue), Service Action Required (amber), and OK (green). See About Fan Module Indicators for a description of these LEDs.
Each of the nine fan modules at the rear of the chassis holds two fans, for a total of 18 fans cooling the blades. The speed of the rear fans is based on the blade's CPU temperatures. Faults are declared by the CMM based on the inability of a fan to be set to a required RPM. The chassis can run indefinitely if only one of the rear fans fails. Multiple failures on the rear fans will not force an automatic shutdown of the blades. The blades will shut down as needed if an overtemperature occurs. The rear fan modules each have a single LED called the OK/Service Action Required indicator. See About Fan Module Indicators for a description of this LED.
The front and rear fan modules are hot-pluggable, customer-replaceable units (CRUs). Removal and replacement of the front or rear fan modules should be completed within approximately one minute to preserve a reasonable chassis thermal environment. However, there is no timer associated with fan removal or replacement so the chassis or blades will not automatically shut down if you take more than approximately one minute for the hot-plug operation, but the chassis will begin to heat more than usual. In the Sun Blade 8000 Chassis, two or more failed or missing front fan modules will shut down the chassis after one minute. To replace a fan module, see Replace Front Fan Module (Sun Blade 8000 Chassis) and Replace Rear Fan Module.