Environmental Monitoring; Error Correction And Parity Checking; Predictive Self Healing - Sun Microsystems Fire T2000 Service Manual

Environmental Monitoring

The Sun Fire T2000 server features an environmental monitoring subsystem
designed to protect the server and its components against:
Extreme temperatures
■
Lack of adequate airflow through the system
■
Power supply failures
■
Hardware faults
■
Temperature sensors located throughout the system monitor the ambient
temperature of the system and internal components. The software and hardware
ensure that the temperatures within the enclosure do not exceed predetermined safe
operating ranges. If the temperature observed by a sensor falls below a low-
temperature threshold or rises above a high-temperature threshold, the monitoring
subsystem software lights the amber Service Required LEDs on the front and back
panel. If the temperature condition persists and reaches a critical threshold, the
system initiates a graceful system shutdown.
All error and warning messages are sent to the system controller (SC), console, and
are logged in the ALOM log file. Additionally, some FRUs such as power supplies
provide LEDs that indicate a failure within the FRU.

Error Correction and Parity Checking

The UltraSPARC T1 multicore processor provides parity protection on its internal
cache memories, including tag parity and data parity on the D-cache and I-cache.
The internal 3MB L2 cache has parity protection on the tags, and ECC protection of
the data.
Advanced ECC, also called chipkill, corrects up to 4-bits in error on nibble
boundaries, as long as they are all in the same DRAM. If a DRAM fails, the DIMM
continues to function.

Predictive Self Healing

The Sun Fire T2000 server features the latest fault management technologies. With
the Solaris 10 Operating System (OS), Sun is introducing a new architecture for
building and deploying systems and services capable of predictive self-healing. Self-
healing technology enables Sun systems to accurately predict component failures
and mitigate many serious problems before they actually occur. This technology is
incorporated into both the hardware and software of the Sun Fire T2000 server.
Chapter 1 Sun Fire T2000 Server Overview 7