High-availability cluster - Wikipedia, the free encyclopedia " High-availability clusters (also known as HA Clusters or Failover Clusters) are computer clusters that are implemented primarily for the purpose of providing high availability of services which the cluster provides. They operate by having redundant computers or nodes which are then used to provide service when system components fail. Normally, if a server with a particular application crashes, the application will be unavailable until someone fixes the crashed server. HA clustering remedies this situation by detecting hardware/software faults, and immediately restarting the application on another system without requiring administrative intervention, a process known as Failover. As part of this process, clustering software may configure the node before star" [1] Quoted from en.wikipedia.org/wiki/High-availabili... [Published: Sat, 02 Aug 2008 07:29:46 GMT] [767 characters, 108 words] [score: 93]	High availability - Wikipedia, the free encyclopedia " High availability . High availability is a system design protocol and associated implementation that ensures a certain absolute degree of operational continuity during a given measurement period. . Availability refers to the ability of the user community to access the system, whether to submit new work, update or alter existing work, or collect the results of previous work. If a user cannot access the system, it is said to be unavailable. Generally, the term downtime is used to refer to periods when a system is unavailable. . " [2] Quoted from en.wikipedia.org/wiki/High_availabili... [Published: Mon, 28 Jul 2008 13:19:23 GMT] [533 characters, 87 words] [score: 257]	High Availability " High Availability Clustering . These days, high availability is in demand. No one wants any services they offer to be unreachable, especially since that downtime will almost undoubtably cost them money. High Availability Linux clusters offers the solution to this need for a lack of downtime. . This page will point you towards various software projects, tools, documentation, and other related sites that deal with high availability Linux clusters. . There are high availability services offered in most load sharing and balancing software. For that reason, you might also want " [3] Quoted from http://lcic.org/ha.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:13 GMT] [580 characters, 90 words] [score: 451]

HomePage: Linux HA " The High Availability Linux Project . The basic goal of the High Availability Linux project is to: . The Linux-HA project is a widely used and important component in many interesting High Availability solutions, and ranks as among the best HA software packages for any platform. We estimate that we currently have more than thirty thousand installations up in mission-critical uses in the real world since 1999. Interest in this project continues to grow. These web pages are average nearly 20000 hits per day, and we see more than 100 downloads of Heartbeat per day. . Heartbeat now shi" [4] Quoted from http://linux-ha.org/ [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:40 GMT] [588 characters, 99 words] [score: 211]	What is high availability? - a definition from Whatis.com - see also: HA " - In information technology, high availability refers to a system or component that is continuously operational for a desirably long length of time. availability can be measured relative to "100% operational" or "never failing." A widely-held but difficult-to-achieve standard of availability for a system or product is known as "five 9s" (99.999 percent) availability. . Since a computer system or a network consists of many parts in which all parts usually need to be present in order for the whole to be operational, much planning for high availability centers around backup and failover processing and data storage and access. For storage, a redundant array of independent disks (RAID) is one a" [5] Quoted from searchdatacenter.techtarget.com/sDefi... [Published: Dynamic Content on Sun, 03 Aug 2008 01:59:48 GMT] [699 characters, 111 words] [score: 278]	High Availability " This High Availability content area includes topics that you can use to design, build, and operate a highly available messaging system based on the release to manufacturing (RTM) version of Microsoft Exchange Server 2007 and Exchange 2007 Service Pack 1 (SP1). The documentation in this area includes: . We recommend that you review the applicable documentation prior to designing or deploying a highly available messaging solution based on Exchange 2007 SP1. . The documentation in this area has been updated to include the latest recommendations and best practices for deploying Exchange 2007 SP1 on Windows Server 2008 and Windows Server 2003 Service Pack 2 (SP2). . While minimum uptime requirements vary among organizations, every organization would like to achieve a high level" [6] Quoted from technet.microsoft.com/en-us/library/b... [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:41 GMT] [796 characters, 110 words] [score: 183]

IBM PowerHA Cluster Manager (HACMP) " For over a decade, IBM HACMP has provided reliable high availability services, monitoring clients mission critical applications running on IBM servers and now the IBM System p and System i servers. From the network server operating systems and applications, HACMP monitors the entire system and can quickly and automatically restart an application on backup hardware in the event of failure or service degradation. The combination of IBM s servers, AIX or Linux for Power , and HACMP provides the highest level of protection and availability. . And to keep the business running even if an entire site is disabled, HACMP/XD (Extended Distance) extends HACMP s capabilities by replicating critical data and enabling failover to a remote site. HA" [7] Quoted from http://www-03.ibm.com/systems/p/ha/ [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:45 GMT] [744 characters, 118 words] [score: 84]	GoldenGate Software, Inc. - the leader in Transactional Data Management " Solutions for "Three States" of High Availability . High availability of applications and their underlying systems should be assessed from the position of the end user. In other words, regardless of the root cause, does the user perceive the system to be down or unavailable? . At any given time, the business can be concerned with any one of three (3) states for the same system -- each state with different underlying technical considerations and potential solutions, but all affecting the availability for end users in the same way (it's either seen as "down" or "running smoothly"). Understandin" [8] Quoted from www.goldengate.com/solutions/highavai... [Published: Dynamic Content on Sun, 03 Aug 2008 02:03:24 GMT] [600 characters, 98 words] [score: 151]	IEEE Task Force on Cluster Computing - High Availability " What is HA? High Availability (HA for short) refers to the availability of resources in a computer system, in the wake of component failures in the system. This can be achieved in a variety of ways, spanning the entire spectrum ranging at the one end from solutions that utilize custom and redundant hardware to ensure availability, to the other end to solutions that provide software solutions using off-the-shelf hardware components. The former class of solutions provide a higher degree of availability, but are significantly more expensive, than the latter class. This has led to the popularity of the latter class, with almost all vendors of computer systems offering various HA products. Typically, t" [9] Quoted from www.ieeetfcc.org/high-availability.ht... [Published: Tue, 17 Feb 2004 05:01:37 GMT] [707 characters, 113 words] [score: 204]

High availability Tomcat - Java World " Email Address: High availability Tomcat Connect Tomcat servers to Apache and to each other to keep your site running . By Graham King, JavaWorld.com, 12/20/04 . You've written a Web application that runs happily in production on Tomcat, probably on port 80. Some early problems might include complaints from your security team because your server runs as a root facing the outside world and excessive traffic traffic beyond what a single server can deal with. . A far more likely problem, however, is that you will need to issue new releases of your application. You may even need to upgrade your version of Tomcat or the operating system. These tasks will require" [10] Quoted from www.javaworld.com/javaworld/jw-12-200... [Published: Dynamic Content on Sun, 03 Aug 2008 01:49:54 GMT] [665 characters, 112 words] [score: 174]	High Availability " Home High Availability . As more and more mission-critical applications move on the Internet, providing highly available services becomes increasingly important. One of the advantages of a clustered system is that it has hardware and software redundancy, because the cluster system consists of a number of independent nodes, and each node runs a copy of operating system and application software. High availability can be achieved by detecting node or daemon failures and reconfiguring the system appropriately, so that the workload can be taken over by the remaining nodes i" [11] Quoted from www.linuxvirtualserver.org/HighAvaila... [Published: Sat, 16 Sep 2006 10:08:14 GMT] [576 characters, 89 words] [score: 246]	High Availability database for real-time, embedded systems � eXtremeDB in-memory embedded database for fault-tolerant applications " eXtremeDB - High Availability Edition embedded database is a fault-tolerant version of eXtremeDB designed to answer the challenge, �How can a RAM database survive the failure of the software or hardware environment in which it operates?� Designed to power embedded systems that cannot afford to fail, eXtremeDB-HA delivers the highest degree of reliability, along with its unsurpassed performance and exceptionally small footprint. In addition to the in-memory database system (IMDS) version, the e X treme DB High Availability database is available as a hybrid embedded database, called e X treme DB HA Fusion, that enables developers to combine all-in-memory with on-disk data storage in the same application. For details on the hybrid capabilities of e X treme DB HA Fusion, see this site s page for the e X treme DB Fusion product. . Process control, telecom and network gear, and other embedded systems with demanding �five-nines� reliability (99.999% up-time) requireme" [12] Quoted from www.mcobject.com/highavailability.sht... [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:43 GMT] [976 characters, 151 words] [score: 244]

The Datacenter High Availability Program " The Datacenter High Availability Program complements the Microsoft Windows Server 2003 R2 Datacenter Edition operating system. The Datacenter High Availability Program has a unique support and services model built for customers with mission-critical server requirements, where reliability and uptime are an absolute requirement. . The Windows Datacenter High Availability Program consists of the following four components: . By implementing solutions built from these key components, Microsoft and its partners are helping customers achieve predictable and manageable systems running their mission critical business applications. The key customer scenarios fo" [13] Quoted from www.microsoft.com/windowsserver2003/d... [Published: Sun, 03 Aug 2008 01:54:43 GMT] [660 characters, 88 words] [score: 311]	Neverfail - High Availability " High availability is not just about data but also about the ability to continue with business regardless of the type of failure. For today's organizations, high availability is essential, especially in industries with strict compliance and regulatory requirements such as financial services, legal and government. . Typical clustering systems support high availability but at a price well beyond the budgetary goals of today's businesses. Simple replication systems lack full-recovery capabilities and require user intervention to restart applications, often taking 15, 20, 30 minutes or more to resume operations. That can mean a significant loss of revenue, productivity and" [14] Quoted from www.neverfailgroup.com/solutions/high... [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:43 GMT] [677 characters, 98 words] [score: 313]	ONLamp.com -- Using Xen for High Availability Clusters " Sign In/My Account View Cart My Account View Cart --> Using Xen for High Availability Clusters by Kris Buytaert and Johan Huysmans 02/05/2008 . The idea of using virtual machines to build high available clusters is not new. Some software companies claim that virtualization is the answer to your HA problems, off course that's not true. Yes, you can reduce downtime by migrating virtual machines to another physical machine for maintenance purposes or when you think hardware is about to fail, but if an application crashes you still need to make sure another application instance takes over the service. And by the time your hardware fails, it's usually already too late to initiate the migrat" [15] Quoted from www.onlamp.com/pub/a/onlamp/2008/02/0... [Published: Sat, 02 Aug 2008 22:25:58 GMT] [695 characters, 115 words] [score: 181]

HA Clusters at OpenSolaris.org " Test Development Download Download the latest Open High Availability Cluster source Participate Join the OpenSolaris HA Clusters discussions Contribute Contribute to Open High Availability Cluster Translation for this page English Deutsch Español Français 日本語 한국어 Portuguese Pусский 简体中文 繁體中文 Overview . High-Availability (HA) Clusters are a class of tightly-coupled distributed systems that provide high availability of services through hardware and software monitoring and hardware redundancy. HA Clusters are often closely associated with the underlying operating system, and in many cases can be considered extensions of the OS. . The focus of this community is implementat" [16] Quoted from www.opensolaris.org/os/community/ha-c... [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:43 GMT] [714 characters, 95 words] [score: 231]	Vision Solutions, Inc. - IBM® Power™ Systems High Availability and Disaster Recovery " White Paper: Introduction to System i High Availability This paper presents an overview of iSeries high availability to companies that are beginning to explore this powerful business continuity technology. The critical components of high availability solutions are detailed in this paper, including data replication engines, system monitors, role swap capabilities, and the importance of autonomic processes. Also provided is information on the cost of planned and unplanned downtime, and a brief overview of disaster recovery strategies. " [17] Quoted from www.visionsolutions.com/Products/High... [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:43 GMT] [540 characters, 76 words] [score: 313]	Overview of High Availability, Server Consolidation in a Virtual Infrastructure - VMware " VMware Evaluate VMware Infrastructure 3 Provide Uniform High Availability at a Lower Cost . Deliver high availability across your entire virtualized IT environment without the cost or complexity of traditional clustering solutions. VMware HA provides cost-effective high availability for any application running in a virtual machine, regardless of its operating system or underlying hardware configuration. VMware HA eliminates the need for dedicated stand-by hardware and additional software. . Download the data sheet for more information or try it for yourself by downloading an evaluation copy of VMware Infrastructure. " [18] Quoted from http://www.vmware.com/products/vi/vc/ha.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:44 GMT] [625 characters, 88 words] [score: 314]

Business Continuity with CA XOsoft High Availability - CA " All of CA About Us Education Insights News and Events Partners Products Security Advisor Small and Medium Business Solutions Home Products Storage and Recovery Management Recovery Management Add another level of data protection to ensure business continuity with automatic failover for continuous application availability with CA XOsoft High Availability. Because data is increasing more rapidly than ever—with evolving types of information requiring strong protection—a single loss could mean irreparable damage to your organization. . What is CA XOsoft High Availability? . It is a business continuity product that offers uninterrupted data protection and near-instantaneous failover and restoration through the comprehensive monitoring and replication of applicati" [19] Quoted from http://ca.com/us/business-continuity.aspx [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:44 GMT] [772 characters, 105 words] [score: 253]

References:
	[1]: Quoted from High-availability cluster - Wikipedia, the free encyclopedia found at http://en.wikipedia.org/wiki/High-availability_cluster [Published: Sat, 02 Aug 2008 07:29:46 GMT] [767 characters, 108 words]
	[2]: Quoted from High availability - Wikipedia, the free encyclopedia found at http://en.wikipedia.org/wiki/High_availability [Published: Mon, 28 Jul 2008 13:19:23 GMT] [533 characters, 87 words]
	[3]: Quoted from High Availability found at http://lcic.org/ha.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:13 GMT] [580 characters, 90 words]
	[4]: Quoted from HomePage: Linux HA found at http://linux-ha.org/ [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:40 GMT] [588 characters, 99 words]
	[5]: Quoted from What is high availability? - a definition from Whatis.com - see also: HA found at http://searchdatacenter.techtarget.com/sDefinition/0,,sid80_gci761219,00.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:59:48 GMT] [699 characters, 111 words]
	[6]: Quoted from High Availability found at http://technet.microsoft.com/en-us/library/bb124721(EXCHG.80).aspx [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:41 GMT] [796 characters, 110 words]
	[7]: Quoted from IBM PowerHA Cluster Manager (HACMP) found at http://www-03.ibm.com/systems/p/ha/ [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:45 GMT] [744 characters, 118 words]
	[8]: Quoted from GoldenGate Software, Inc. - the leader in Transactional Data Management found at http://www.goldengate.com/solutions/highavail.html [Published: Dynamic Content on Sun, 03 Aug 2008 02:03:24 GMT] [600 characters, 98 words]
	[9]: Quoted from IEEE Task Force on Cluster Computing - High Availability found at http://www.ieeetfcc.org/high-availability.html [Published: Tue, 17 Feb 2004 05:01:37 GMT] [707 characters, 113 words]
	[10]: Quoted from High availability Tomcat - Java World found at http://www.javaworld.com/javaworld/jw-12-2004/jw-1220-tomcat.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:49:54 GMT] [665 characters, 112 words]
	[11]: Quoted from High Availability found at http://www.linuxvirtualserver.org/HighAvailability.html [Published: Sat, 16 Sep 2006 10:08:14 GMT] [576 characters, 89 words]
	[12]: Quoted from High Availability database for real-time, embedded systems � eXtremeDB in-memory embedded database for fault-tolerant applications found at http://www.mcobject.com/highavailability.shtml [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:43 GMT] [976 characters, 151 words]
	[13]: Quoted from The Datacenter High Availability Program found at http://www.microsoft.com/windowsserver2003/datacenter/dcprogram.mspx [Published: Sun, 03 Aug 2008 01:54:43 GMT] [660 characters, 88 words]
	[14]: Quoted from Neverfail - High Availability found at http://www.neverfailgroup.com/solutions/high-availability.aspx [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:43 GMT] [677 characters, 98 words]
	[15]: Quoted from ONLamp.com -- Using Xen for High Availability Clusters found at http://www.onlamp.com/pub/a/onlamp/2008/02/05/using-xen-for-high-availabilty-clusters.html [Published: Sat, 02 Aug 2008 22:25:58 GMT] [695 characters, 115 words]
	[16]: Quoted from HA Clusters at OpenSolaris.org found at http://www.opensolaris.org/os/community/ha-clusters/ [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:43 GMT] [714 characters, 95 words]
	[17]: Quoted from Vision Solutions, Inc. - IBM® Power™ Systems High Availability and Disaster Recovery found at http://www.visionsolutions.com/Products/High-Availability-Overview.aspx [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:43 GMT] [540 characters, 76 words]
	[18]: Quoted from Overview of High Availability, Server Consolidation in a Virtual Infrastructure - VMware found at http://www.vmware.com/products/vi/vc/ha.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:44 GMT] [625 characters, 88 words]
	[19]: Quoted from Business Continuity with CA XOsoft High Availability - CA found at http://ca.com/us/business-continuity.aspx [Published: Dynamic Content on Sun, 03 Aug 2008 01:54:44 GMT] [772 characters, 105 words]
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