Main contents:
describe the main features of the enterprise line of UltraSPARC servers
Illustrate the performance improvement over previous systems
describe what the reliability,availability,and serviceablility(RAS) feature set provides to our customers

RAS is a set of enterprise computing technologies that furnish a high degree of protection for corporate data(reliability),provide near continuous data access(availability),and incorporate procedures to correct problems with minimal business impact(serviceablility)

The RAS reature set focus is to warn the operator about problems,and act on their effects

Features that improve data integrity:
end-to-end error checking and correction(ECC) protection of data
address and control lines are parity protectd
improved hardware monitors

Features that improve system reliability:
reliable system design
enhanced environmental monitoring
system monitoring
automatic system reconfituration(ASR)
redundant components

Some of the serviceability features of the Sun Enterprise servers:
greatly reduced time to repair
hot pluggable CPU/memory+,I/O boards are strong serviceability features
dynamic reconfiguration eliminates the need for a reboot to logically attach a new or replacement board
many system components are identical across the sun enterprise server line so the service provider carries fewer spares
improved diagnostics identify a system component failure more accurately
system service processor(SSP)

两种维护方法：
Dynamic Reconfiguration(DR) is the ability to alter the configuration of a running system by bringing components online or taking them off-line with minimal disruption to the system operation
Alternate Pathing(AP) creates a new layer of device drivers called meta-disks and meta-networks, which route access to one of two physical device drivers. you must create the meta-devices yourself; the system does not automatically create these for you

Sun Management Center is a comprehensive system monitoring tool for the Sun Enterprise servers. its graphical user interface(GUI) and intuitive design make it easy to learn and use.
The Remote System Control(RSC) software works only with the SSP option on the Enterprise 250
RSC enables the following to be performed from a remote console:
run diagnostic tests
view diagnostic
read error messages
reboot your server
display environmental status information