fault tolerant


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fault tolerant

fault tolerant

The ability to continue non-stop when a hardware failure occurs. A fault-tolerant system is designed from the ground up for reliability by building multiples of all critical components, such as CPUs, memories, disks and power supplies into the same computer. In the event one component fails, another takes over without skipping a beat.

Tandem and Stratus were the first two manufacturers that were dedicated to building fault-tolerant computer systems for the transaction processing (OLTP) market.

High Availability
Many systems are designed to recover from a failure by detecting the failed component and switching to another computer system. These systems, although sometimes called fault tolerant, are more widely known as "high availability" systems, requiring that the software resubmits the job when the second system is available.

Redundant Hardware
True fault tolerant systems with redundant hardware are the most costly because the additional components add to the overall system cost. However, fault tolerant systems provide the same processing capacity after a failure as before, whereas high availability systems often provide reduced capacity. See fault management.


A RAID Array
This RAID II prototype in 1992, which embodies principles of high performance and fault tolerance, was designed and built by University of Berkeley graduate students. Housing 36 320MB disk drives, its total storage was less than the disk drive in the cheapest PC only six years later. (Image courtesy of The Computer History Museum, www.computerhistory.org) See RAID.







Redundancy
Redundancy is the hallmark of fault tolerant systems. This storage server from Xtore Extreme Storage (www.xtore-es.com) contains multiple, hot-swappable power supplies to ensure continued operation.
References in periodicals archive ?
The surveyed approaches in server Fault Tolerant can be divided in two groups: Fault Tolerant in physical servers covering Fault Tolerant techniques for physical servers and storage units.
Aitouche, "Sensor network design for fault tolerant estimation," International Journal of Adaptive Control and Signal Processing, vol.
Active Gate Controlled SiC Protection Switch for Fault Tolerant Operation
File access frequency in the life cycle may change at any time, so it needs adaptive switching algorithm to change fault tolerant strategy.
Optimum fault tolerant control is developed in [14-15] to improve the generated output torque of five-phase PM machines, and at the same time, to limit the stator ohmic loss which can provoke thermal stress and damage the machine.
The above brief outline of fault tolerant methods for FPGAs is not meant to be exhaustive but rather to provide some context and to highlight some past approaches which are relevant for our proposed approach to fault tolerance on arithmetic logic circuits implemented on FPGAs.
"NEC is one of the premier manufacturers of Intel Xeon processor-based fault tolerant servers," said Patrick Buddenbaum, Director of Intel's Mission Critical Computing segment.
Tweet this: @StorageSwiss picks @Gridstore's grid-based scale-out #NAS solution over High Availability and Fault Tolerant storage http://bit.ly/Ihl3n7
Securiguard Security Services choose NEC Fault Tolerant for cost effectiveness and high availability servicesNew servers to support CCTV and Access Control systems SecuriGuard Tech, one of British Columbia's largest and highly-respected private security organizations, has selected the NEC Express5800/320Fd-MR Fault Tolerant server to ensure highavailability of its security solutions provided to their customers in the UAE.
Hamiltonian graphs are also explained, including those that are optimal k-fault tolerant and optimal 1- fault tolerant.
The old system was based on cluster and while it provided high availability, it needed dedicated resource, and an increased level of support to run applications in order to keep the system running.<p>The company's production and technology team were looking for a solution that could not only reach its expectations of high availability (no down time) but without the need for additional expertise for the support or maintenance, ensuring business continuity and low total cost of ownership (TCO).<p>The solution <p>After about two months of research, the team at National Paints opted for NEC's Fault Tolerant, six NEC Standard 2U rack mount server and a Backup Smart Way.

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