Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 31)

100

101

Feature

Cluster Type

L4 UDP L4, L7 TCP L7 HTTP L7 HTTPS

Load balancing

policies

Round Robin, StaticWeight, Adaptive, Fastest response,

Least Connections, Server Agent, Custom

Server failure

detection (probes)

ICMP, TCP, Health Check ICMP, TCP, ACV, Health Check

Persistence Based on IP Using Cookies

Server selection by

request content (i.e.,

Match Rules)

No; load is balanced according to current load balancing policy.

Yes; load is balanced according

to decisions made by examining

request content.

Load balanced

protocols

Ideal for statelessUDP-based

protocols, such as DNS and

RADIUS; WAP gateways; NFS

server clusters that provide a

single-system image.

Ideal for stateful TCP-based

protocols, such as HTTP, HTTPS,

SMTP, FTP,

LDAP/LDAPS

and others.

HTTP HTTPS

NAT and spoofing

Yes

Regardless of cluster type, Equalizer uses intelligent load balancing

algorithms

to determine the best server to

receive a request. These algorithms take into account the configuration options set for the cluster and servers,

real-time server status information, and information from the request itself. For Layer 7 clusters, user-defined

match rules can also be used to determine the route a packet should take.

Load Balancing Configuration

When you configure a virtual cluster, you can select one of the following load-balancing algorithms to control how

Equalizer balances the load across your servers: round robin, static weight, adaptive, fastest response, least

connections, server agent, or custom.

When you configure the servers in a virtual cluster, you assign an

initial weight

between 0 and 200 for each server.

When you select one of the adaptive load-balancing algorithms (i.e., any algorithm other than round robin),

Equalizer uses the servers’ initial weights as a starting point to determine the percentage of requests to route to

each server. Each server handles a percentage of the total load based on its fraction of the total weights in the

server cluster. Equalizer dynamically adjusts server weights according to real-time conditions to ensure that

Equalizer routes requests to the server that is best able to respond. A server with a weight of zero (0) is considered

down or unavailable, and Equalizer does not route requests to servers in this state.

Real-Time Server Status Information

Equalizer gathers real-time information about a server’s status using ICMP Probes, TCP Probes, Active Content

Verification (ACV), and Server Agents. ICMP and TCP Probes are the default probing methods.

Equalizer Administration Guide

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