HP SuperStack 3 Load Balancer Appliance Supported Algorithms Description Round Robin, Response

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70CHAPTER 8: CONFIGURING FOR LOAD BALANCING

6Choose a balancing algorithm. The default balance profile is Round-robin. Table 11 describes the available algorithms.

Table 11 Supported Algorithms and Descriptions

Supported Algorithms	Description

Round Robin	Each new connection is assigned to the next server in
	the list. This distributes connections evenly between
	the servers.
Weighted Round Robin	Similar to Round Robin, except that N consecutive new
	connections are assigned to a server before selecting
	the next server in the list, where N is the weight
	assigned to the server. Servers with higher
	performance or capacity should be assigned higher
	weight.
	The weight assigned to the server is assigned using the
	Assign server to service (Advanced)... window. A
	weight field is provided.
Least Connections	Each new connection is assigned to the server having
	the fewest number of open connections. If several
	servers have the same low number of open
	connections, then the new connection is sent to the
	server that was least recently sent a new connection
Weighted Least	Similar to Least Connections, except that N consecutive
Connections	new connections are assigned to a server before next
	selecting the server with the least number of open
	connections, where N is the weight assigned to the
	server
Quickest Last Response	When a new connection is established between a
	client and server, the Server Load Balancer monitors
	the client's first request for data. When the server
	responds to the initial request, the Server Load
	Balancer notes the time delay between the request and
	the response and stores that value as the server's
	response time. Each new connection is sent to the
	server having the fastest response time.
	Since server response time changes dynamically, a
	decay algorithm is applied periodically to all response
	times to prevent a server from being locked out after
	one long response delay
Quickest Average	Similar to Quickest Last Response, except the response
Response	time is averaged over approximately the last eight
	measurements for the server. A decay algorithm is also
	applied to the average response times

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Contents SuperStack 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Setting UP for Management Technical Specifications and PIN-OUTS 3Com Knowledgebase Web Services About this Guide Icon Description ConventionsConvention Description Registration Related DocumentationProduct DocumentationAbout this Guide Balancer Server Load Balancer Feature Server Load Balancer Plus MemoryFeature Server Load Balancer Plus Algorithms 12 10/100 LAN PortsServer Load Balancer Front View Detail10/100BASE-T Port Status LEDs Color Indicates Power/Self Test LEDPower LED 1000BASE-SX Port Status LEDsPower Socket Balancer Rear View DetailDocumentation shipped with the power system Advanced Redundant Power System outputType 3 Power Module, read the Safety Information section Disconnecting the power cordInstalling the Server Load Installing the Server Load Balancer Rack-mounting Server Load Balancer if they have been fittedPlacing Units On ChoosingCorrect Cables Top of Each OtherPowered-up and ready for operation Power-upSequence Problem Suggested Solution On powering-up, the Power/Self Test LED lights yellowSetting UP for Management Assigning an IP Methods Managing Server Load BalancerAddress SEC Setting UP for Management Interface Security Warning Window To install the plug-in, complete the following steps Web Interface pages appearsInterfacesteps Network Password window appearsAfter a management session Banner Using the Web InterfaceWeb interface is made up of three areas Navigation TreeSystem Summary Summary information is displayed in a two tablesDevice Summary Port Hotspots Unit HotspotControl Buttons Color ActionLogical View Button Action Help View Management Setting up SnmpTrap Community String field is defaulted to public SpecifyingOperating Software UpgradingLoad Balancer Working with the WEB Interface Server Load Balancing Example ConfigurationBalancing Approximately double the performance of Server BConfiguring for Non-redundant Server Load Balancing Click Next. The Getting Started Password page appears Configuring Redundant Redundant Server Balancer 1 and is configured for the same serviceLoad Balancing Redundancy Configuring forActive-Passive Load Balancer for active-passive redundancyEnter 10.20.30.56 in the Device B IP Address field Active-Active Load Balancer for active-active redundancyClick Next. The Getting Started IP Settings page appears Enter 25 in the Virtual router ID a field SettingSettings Enter 26 in the Virtual router ID B fieldConfiguring Redundant Server Load Balancing Redirection Cache Redirection Configuration Example Subnet ConfigurationDefining a Cache Non-redundantClick Next Click Finish. Your cache subnet has been added Assigning Caches to ServicesAdding a Cache Been createdSteps Enter a descriptive name, such as Cache2, in the Name fieldSupported Algorithms Description Destination Weighted Round RobinWeighted Least Round RobinRetries field TimeoutThis sets the number of retries a health check is attempted Balancing Click Next. The Server Subnet Define Subnet page appears Click Finish. Your server subnet has been addedChanging Lan Port Roles Adding a Server Enter a descriptive name, such as Web, in the Name field Click Continue with Advanced SettingsHighlight Http and click the Next Assigning Servers To ServiceServer load balancing service Showing StatusClick on the cell next to Server A. a pop-up menu appears Click Server AssignmentsEnter 8080 in the Server port field Click OK This user group Adding a UserGroup To add a user group, complete the following stepsTo assign permissions, complete the following steps Click PermissionsQuickest Average Supported Algorithms Description Round RobinQuickest Last Response ResponseThis sets the number of retries in a health check period Filters Select the attack filters you wish to enable and click OKMitigation Filter DescriptionModifying Monitor Access Modifying Admin AccessSelect Security User Configuring for Load Balancing Safety Information Important Safety InformationImportant Safety Information Personnel qualifié ’information deSécurité Importante Hub plus étroites’information de Sécurité Importante Wichtige Sicherheitsinformat ionen EuropeAchtung Faseroptikanschlüsse Optische Sicherheit Appendix a Safety Information PIN -OUTS SpecificationsBalancer and the Server Load Balancer Plus Pin to RS232 25-pin Console Port CablePC-AT Serial Pin to 9-pinOnline Technical Services3Com Username anonymous Asia, Pacific Rim Europe, Middle East AfricaNorth America Country Telephone Number Fax Number Appendix C Technical Support Index NumbersSpecifications, system 83 summary view Summary view 32 World Wide Web WWW Index Superstack 3 Server Load Balancer 3C16120 Obtaining Warranty Service Warranties Exclusive Other Services Regulatory Notices

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