Redundant Configurations

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

yImproves the availability of the server if a component fails

yAllows the removal of a failing component without stopping the server

yAllows 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:

yPower supplies (n+1)

yFans (n+1)

ySystem processors

yMemory

yI/O

yCompatibility 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.

For More Information

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NEC A1160 manual Redundant Configurations, Replaceable Components, Clustering Software