Redundant hot-plug fans

NOTE: This procedure shows images of the SCSI model server, but it also applies to the SAS model server.

In the standard configuration, five fans cool the server. For the redundant configuration, three additional fans are added to allow the server to continue operation in non-redundant mode if any one fan fails.

The server supports variable fan speeds to allow the speed of all fans to increase if the temperature in any area increases. The fans will run at minimum speed until a temperature change requires a fan speed increase to cool the server.

The server shuts down in the following scenarios:

• At POST:
  • The BIOS suspends the server for 5 minutes if it detects a cautionary temperature level. If the cautionary temperature level is still detected after 5 minutes, the BIOS performs an orderly shutdown and then restarts. This process repeats until the cautionary temperature level is no longer detected.
  • The BIOS performs an orderly shutdown if less than five fans are operating in the standard configuration or if less than seven fans are operating in the redundant configuration.
  • The server performs an immediate shutdown if it detects a critical temperature level.

    IMPORTANT: An immediate shutdown is a hardware-controlled function and it overrides any firmware or software actions.

• In the OS:
  • With the health driver loaded and thermal shutdown enabled in RBSU, the health driver performs an orderly shutdown if it detects a cautionary temperature level. If the server detects a critical temperature level before the orderly shutdown occurs, the server performs an immediate shutdown.

    Additionally, the health driver performs an orderly shutdown if less than five fans are operating in the standard configuration, or if less than seven fans are operating in the redundant configuration.

  • With the health driver loaded and thermal shutdown disabled in RBSU, the server performs an immediate shutdown if it detects a critical temperature level.
  • Without the health driver loaded, the server performs an immediate shutdown if it detects a critical temperature level.

    IMPORTANT: An immediate shutdown is a hardware-controlled function and it overrides any firmware or software actions.