System Reliability, Availability, And Serviceability; Hot-Swappable Components - Sun Microsystems Sun Fire V215 Getting Started Manual

The ALOM circuitry uses standby power from the server. This means that:
ALOM is active as soon as the server is connected to a power source, and remains
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active until power is removed by unplugging the power cable.
ALOM continues to be effective even when the operating system is offline and
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when the server is in Standby mode.
For more information about ALOM, see the Sun Advanced Lights Out Management
(ALOM) Administration Guide.
System Reliability, Availability, and
Serviceability
Reliability, availability, and serviceability (RAS) are aspects of a system's design that
affect its ability to operate continuously and to minimize the time necessary to
service the system. Reliability refers to a system's ability to operate continuously
without failures and to maintain data integrity. System availability refers to the
ability of a system to recover to an operational state after a failure, with minimal
impact. 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 Sun Fire server
offers the following features:
Hot-pluggable hard drives
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Redundant, hot-swappable power supplies
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Redundant, hot-swappable fans
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Environmental monitoring
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Error detection and correction for improved data integrity
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Easy access for most component replacements
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Hot-Swappable Components

Sun Fire hardware is designed to support hot-swapping of components. You can
install or remove these components while the system is running. Hot-swap
technology significantly increases the system's serviceability and availability by
providing the ability to replace components without service disruption.
Introducing the Sun Fire V215 and V245 Servers 21