Sun Microsystems 280R manual Error Correction and Parity Checking

About System Reliability, Availability, and Serviceability Features

Reliability, availability, and serviceability (commonly known as RAS) are three design goals contributing to continuous operation and minimizing system downtime. Reliability refers to a system’s ability to operate continuously without failures and to maintain data integrity. System availability refers to the percentage of time that a system remains accessible and usable. Serviceability relates to the time it takes to restore a system to service following a system failure. Together, reliability, availability, and serviceability features provide for near continuous system operation.

To deliver high levels of reliability, availability, and serviceability, the system offers the following features:

■Error correction and parity checking for improved data integrity

■Easily accessible LED status indicators

■Hot-pluggable disk drives with status indicators and easy front access

■External support for RAID 0, 1, 0 + 1, and 5 implementations

■System environmental monitoring and control

■Power supply redundancy

■Hot-swappable power supplies

■Automatic system recovery (ASR)

■Improved system diagnostics software

■Enhanced system availability software

■Alternate pathing (alternate I/O network and disk paths)

■Sun Cluster software support

■Remote System Control (RSC) hardware and software

Error Correction and Parity Checking

Error-correcting code (ECC) is used on all internal system data paths to ensure high levels of data integrity. All data that moves between processors, I/O, and memory have end-to-end ECC protection.

64 Sun Fire 280R Server Owner’s Guide • January 2001