Support For Raid Storage Configurations; Error Correction And Parity Checking; Fault Management And Predictive Self Healing - Sun Oracle Netra T5220 Installation Manual

Temperature sensors are located throughout the system to 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
operation 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. In the event of a failure of the system
controller, backup sensors protect the system from serious damage, by initiating a
forced hardware shutdown. Required LEDs remain lit after an automatic system
shutdown to aid in problem diagnosis.
The power subsystem is monitored in a similar fashion by monitoring power
supplies and reporting any fault in the front and rear panel LEDs.

Support for RAID Storage Configurations

You can set up hardware RAID 1 (mirroring) and hardware RAID 0 (striping)
configurations for any pair of internal hard drives, providing a high-performance
solution for hard drive mirroring.
By attaching one or more external storage devices to the Sun Netra T5220 server, you
can use a redundant array of independent drives (RAID) software application such
1
as Solstice DiskSuite™ or VERITAS Volume Manager to configure system drive
storage in a variety of different RAID levels.

Error Correction and Parity Checking

The UltraSPARC T2 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 L2 cache has parity protection on the tags, and ECC protection on the
data.
Advanced ECC, 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.

Fault Management and Predictive Self Healing

The Sun Netra T5220 server provides the latest fault management technologies. The
Solaris 10 OS architecture provides a means for building and deploying systems and
services capable of predictive self-healing. Self-healing technology enables systems to
1. Software RAID applications such as VERITAS Volume Manager are not included with this server. You must
obtain and license them separately.
12 Sun Netra T5220 Installation Guide • November 2011