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Redundant Configurations
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hardware resources among cluster nodes in response to planned and unplanned events.
This reallocation is virtually impossible to accomplish in a traditional cluster.
Clustering Software
Express5800 systems support various clustering paradigms, including shared disk
clusters, and shared nothing (only interconnected) clusters.
Redundant Configurations
Redundant configurations ensure that Express5800 systems do not have a single point
of failure. Redundancy
y Improves the availability of the server if a component fails
y Allows the removal of a failing component without stopping the server
y Allows the removal of a failing component with an automatic reboot, if the operating
system cannot remain running while the failed component is replaced
A system that consists of a single cell provides redundant power and cooling. Complete
redundancy is provided in multiple- cell systems. Redundancy is available for the
following hardware components:
y Power supplies (n+1)
y Fans (n+1)
y System processors
y Memory
y I/O
y Compatibility hardware
Replaceable Components
Replaceable components are hardware assemblies or subassemblies that can be
replaced onsite to either upgrade the server or replace a failing component.
Hot-swappable components can be replaced when the power is on and the operating
system is running. Hot-pluggable components can be replaced when the power is on but
the operating system is stopped.
The cell contains both customer-replaceable components and field-replaceable
components. When the management system detects a fault in the cell, it displays the
component name on the control panel LCD. All customer-replaceable components can
be replaced with the power on and the partition running. No special training or tools are
required to replace a customer-replaceable component. Field-replaceable components
require special handling and are replaced by service representatives.
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