NEC 320Lb-R manual Fault-Tolerant Hardware

As application requirements increase, you can expand your server with additional processors, additional memory, add-in boards and peripheral devices.

Your server features the following major components:

!Up to two high-performance Xeon 2.4GB processors in each CPU module.

!Up to 3 GB of Synchronous Dynamic Random-Access (SDRAM) system memory in each CPU module.

!Three PCI expansion slots, which support one 32-bit/33Mhz and two 64-bit/33Mhz PCI adapter cards in each PCI module. One of the PCI expansion slots in each PCI module contains a graphics board.

Fault-Tolerant Hardware

The hardware architecture of the system provides fault tolerance transparency. If a hardware component fails, the application program continues processing and is never aware that a failure occurred.

To provide system redundancy this system uses dual hardware technology. That means that all major components are mirrored within a single hardware chassis. There are two CPU modules and each CPU module is operating in lockstep (performing the same instructions at the same time) with the other as a single system. Thus, if a failure occurs in one CPU module the other CPU module will continue to operate with no interruption, no loss of data, and system performance is not affected. Note that the PCI module, PCI adapters, and power supplies are also paired for system redundancy.

1-4 System Overview