THE WHATIS.COM WORD-OF-THE-DAY January 13, 2003 hardware clustering ______________ TODAY'S SPONSOR: Free CRM whitepapers
Download the key papers you need today to make better-informed decisions. Targeted categories include: Business Intelligence, Data Warehousing, CRM Technology, Customer Service, and Implementation, Integration, and Business Processes. Click here to access the free SearchCRM.com white papers section. http://searchcrm.techtarget.com/whitepapers3/0,,sid11,00.html ______________ TODAY'S WORD: hardware clustering See our complete definition with hyperlinks at http://searchsolaris.techtarget.com/sDefinition/0,,sid12_gci873501,00.html Hardware clustering (sometimes called operating system clustering) is a hardware-based method of turning multiple servers into a cluster (a group of servers that acts like a single system). As a rule, a hardware cluster is created by installing a number of blade servers on the machine that will control the cluster. Each of the blade servers functions independently of the others, although they all respond to the same requests. The operating system of the controlling server is responsible for monitoring the cluster and performing administrative tasks, such as deciding when failover is necessary and assigning the load of a failed node to a functioning server. A hardware cluster may be active-passive, in which case some redundant servers are reserved for failover duty and do not run any applications of their own. It can also be active-active, in which case all servers in the cluster run their own applications but also reserve resources to allow them to perform failover duty for each other. Hardware clustering typically requires some software application changes. The alternative to hardware clustering, application clustering, is a fully software-based method of clustering servers. Because application clustering doesn't require specialized hardware, it is usually less expensive to implement than hardware clustering. RELATED TERMS: blade server http://search390.techtarget.com/sDefinition/0,,sid10_gci770169,00.html cluster http://whatis.techtarget.com/definition/0,,sid9_gci211801,00.html failover http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci753437,00.html ______________________ SELECTED LINKS: SearchSolaris offers a collection of Best Web Links about Linux hardware clustering. http://searchsolaris.techtarget.com/bestWebLinks/0,289521,sid12_tax289031,00.html Lotus Domino Administrator 6 Help explains "How operating system clusters work". http://www-12.lotus.com/ldd/doc/domino_notes/Rnext/help6_admin.nsf/f4b82fbb75e942a6852566ac0037f284/8fc56d02d24d9c7e85256c1d00399979?OpenDocument HostingTech explains The art of JRun server clustering. http://www.hostingtech.com/dp/02_02_jrun.html ______________________ QUIZ #24 | Web Services What do SOAP, XML, and UDDI have to do with Web Services? Take our quiz and expand your knowledge. http://searchwebservices.techtarget.com/sDefinition/0,,sid26_gci811081,00.html ______________________ Learning Path | Customer Relationship Management Give yourself a quick tutorial in customer relationship management (CRM) by reading our series of related definitions in sequence. http://searchcrm.techtarget.com/sDefinition/0,,sid11_gci788453,00.html ______________________ REAL-LIFE CHALLENGE | X-rated HTML spam Company Y is looking for a way to block HTML porn spam in Outlook. Can you advise? http://whatis.discussions.techtarget.com/WebX?[EMAIL PROTECTED]@.1dcfae0e/205!viewtype=threadDate&skip=&expand= ______________________________ RECENT ADDITIONS AND UPDATES [1] Information Awareness Office http://searchsecurity.techtarget.com/sDefinition/0,,sid14_gci873293,00.html [2] petaflop http://whatis.techtarget.com/definition/0,,sid9_gci212778,00.html [3] FOLED http://whatis.techtarget.com/definition/0,,sid9_gci873217,00.html [4] ASAP http://searchsap.techtarget.com/sDefinition/0,,sid21_gci871489,00.html [5] Online Service System http://searchsap.techtarget.com/sDefinition/0,,sid21_gci871202,00.html ____________________________________________________________________ ::::::::::::::::::: WHATIS.COM CONTACTS ::::::::::::::::::: LOWELL THING, Site Editor ([EMAIL PROTECTED]) ____________________________________________________________________ MARGARET ROUSE, Associate Editor ([EMAIL PROTECTED]) ___________________________________________________________________ :::::::::::::::::::: ABOUT THIS NEWSLETTER ::::::::::::::::::::: Published by TechTarget (http://www.techtarget.com) TechTarget - The Most Targeted IT Media Copyright 2003, All Rights Reserved. Unsubscribe from 'Word of the Day' - Simply Reply to this Email with REMOVE within the Body or Subject > or - Go to: http://WhatIs.techtarget.com/register - Log in to edit your profile. - Click on the link to Edit email subscriptions. - Uncheck the box next to the newsletter you wish to unsubscribe from. - When finished, click "Save Changes to My Profile."
