Clustering
A cluster of servers provides fault tolerance and/or load balancing. If one server fails, one or more additional servers are still available. Load balancing distributes the workload over multiple systems.
![]() | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2009 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- How do we measure high availability?
- Over the past 2 months, I've seen an increase in the number of end user inquiries regarding high availability and almost more importantly, how to measure high availability HA. HA means something different depending on whom you're talking with so it's worth a quick definition. I define HA as: ...
- Blog posts 2009-07-01
- R 2.9.1 (Mac)
- R is a language and environment for statistical computing and graphics. It is a GNU project which is similar to the S language and environment which was developed at Bell Laboratories (formerly AT&T, now Lucent Technologies) by John Chambers and colleagues. R can be considered as a different implementation of...
- Software downloads 2009-06-26
- RNA Networks launches RNAcache
- RNA Networks is launching RNAcache, a product that lives along the border of processing virtualization, network virtualization and storage virtualization by offering the capability to use server memory on many systems as a shared network resource. RNA Networks is one a number of suppliers that are melding high performance computing,...
- Blog posts 2009-06-23
- (yX) for Excel 1.1 (Mac)
- 2 data modeling applications, yX for Excel and KnowledgeMiner 6.0 both in one download. yX has 3 main differences from KnowledgeMiner. 1. yX works in Microsoft Excel and can export models back to Excel. 2. yX contains a subset of the features in KnowledgeMiner. 3. yX Is...
- Software downloads 2009-06-16
- TechNet Webcast: Windows Server 2008 R2 Technical Overview (Part 2 of 2) (Level 300)
- The presenter of this webcast gives technical overview of the Windows Server 2008 R2 operating system. The presenter looks at scalability, failover clustering, Web, and Windows 7 and Windows Server 2008 R2 better together features. The presenter also covers the changes in Windows Server 2008 R2 that improve scalability and...
- Webcasts 2009-06-11
- iDefrag 1.6.9 (Mac)
- Advanced Mac OS X disk defragmentation and optimization. Supports the very latest features of HFS+, including journaling, case sensitive filenames and adaptive hot file clustering (which means it won't mess-up the Hot Zone).
- Software downloads 2009-06-08
- iMetaSearch 3.0 (Windows)
- A faster, smarter Internet search tool with cutting-edge methods for indexing and clustering results. iMetaSearch gathers the best results from the best search engines and then uses Latent Semantic Analysis to intelligently index and cluster results. Searches can be exported to Excel for analysis, tracked over time to detect new...
- Software downloads 2009-06-04
- Virtualization is not virtual machine software
- Virtualization is something that has been around for quite a long time. It has been a staple of the mainframe world for well over 30 years. It has been part of the midrange systems world for over 20 years. It has been emerging in the world of industry standard systems...
- Blog posts 2009-06-02
- SQL-RD 5.6 Build 20090511 (Windows)
- SQL-RD saves time and money by allowing you to schedule and manage MS SQL Reporting Services Reports on numerous servers from a single application. It exports your RS reports to multiple printers, FTP, Secure FTP, email, folders, FAX and SMS. Choose to output to doc, xls, rtf, wk*, dbf, htm,...
- Software downloads 2009-06-02
- Google I/O: How do I code thee? Let me count the ways
- Dan Morrill presented a great talk this morning on the 3 different ways to code for Android: Managed Code Dalvik, Ajax, and Native Code. To demonstrate the different ways Dan decided to write the same app , a k-means clustering application, 3 different ways. The first way...
- Blog posts 2009-05-27
- Microsoft Office still owns the desktop, future of StarOffice unclear
- Microsoft Office still owns the desktop, future of StarOffice unclearMakes you wonderStarOffice/OpenOffice is so far behind MS Office that it isn't even funny. They are lagging in performance, usability, innovation, features, programmability. It looks like Office 97. featurewise and quite literally.It is the cheapo free/cheap alternative you only accept because...
- Discussion threads 2009-05-26
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- From time to time, someone will ask me if it makes sense to purchase a large (32+ CPU) server as a big virtualization host running a VMware, Microsoft, or Citrix hypervisor. In a word, I think the answer is "no". Here are a few...
- Blog posts 2009-05-20
- Inside SQL Server 2008 - Exploring High Availability and Scalability Enhancements
- SQL 2005 introduced High Availability and scalability enhancements, such as database mirroring and improved failover clustering from earlier versions. Microsoft is shooting for close to zero downtime with the launch of SQL 2008 by incorporating availability and recovery features that were previously only available in third-party solutions. These features include...
- White papers 2009-05-20
- Windows Azure: a very difficult concept explained
- Since the announcement of Windows Azure, codenamed "Red Dog" as discovered by my colleague Mary-Jo Foley, at PDC 2008, I have felt an element of doubt hanging over the service, simply because I didn't know enough about it. This post will explain everything you need to know about Azure -...
- Blog posts 2009-05-01
- Make no bones about it: Server 2008 R2 is really Windows Server 7
- Whether you call it Windows Server 2008 R2 or Windows Server 7, there's no doubt that this is a major Server product release for Microsoft. While the Windows 7 Release Candidate is getting all the attention this week, I thought I might bring...
- Blog posts 2009-04-30
- Ubuntu 9.04 to be available for download Thursday
- Â Canonical will make its much anticipated Ubuntu 9.04 upgrade available for download on Thursday. The platform --which includes a desktop, server and netbook edition -- offers faster bootups (as fast as 25 seconds, its developers say), cloud support, OpenOffice 3.0, support for Skype...
- Blog posts 2009-04-22
- VMware wants to be your network operating system of choice
- Whenever a company changes the name of their major product you often have to wonder what level of change they are trying to signal. In the case of VMware which changed ESX to vSphere yesterday, the signal is one of intent. They could have called it vWorldDomination but that might...
- Blog posts 2009-04-22
- Oracle to Buy Sun - View from the Virtual World
- If Oracle's acquisition of Sun actually becomes a market reality, it will most certainly change the dynamics of the market for servers, operating systems, development tools, database management systems, applications and, of course, virtualization technology. Let's take a dark view of the possibilities in each area. ...
- Blog posts 2009-04-20
- Microsoft to release Exchange 2010 beta on April 15
- Microsoft to release Exchange 2010 beta on April 15Same ole stuff, new nameAnd let me guess it requires a firewall, anti-virus and other expensive items.I wonder if they give refunds for viruses and hackers?A version without a tie-in to Office/Outlook?You'd probably need to go all the way back to their...
- Discussion threads 2009-04-14
- NMath Stats 3.0 (Windows)
- NMath Stats contains probability distributions, combinatorial functions, descriptive statistics, multi-type data table, multiple linear regression, hypothesis tests, analysis of variance ANOVA, partial least squares, non-negative matrix factorization and clustering, and multivariate statistics for the .NET platform. Evaluation version available. Purchased product includes source code, user manual, and examples.Version 3.0 adds...
- Software downloads 2009-04-13
Neighboring Terms
Smartphones
- Last year, many businesses deferred the purchase of new laptops in favor of smartphones, and why not? Offering phone, calendar, email, IM and Web access, they're arguably the most practical business tools. Check out the latest CNET Reviews of Blackberry devices for all the knowledge you need to make an intelligent choice.
- Sleek. Thin. Light.
- With its full keyboard and high-res screen, the BlackBerry® Curve 8900 is the perfect fit for your work and your life. Learn more



