Coyote Point Systems Equalizer GX Series, Administration Manual

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Glossary
and the server is expected to reply with a number between -1 and 100 to say exactly how alive it is. In order to give Equalizer a
proper answer to the health check query, the server needs to run a Server Agent.
server cluster
A group of servers that are components in a network and joined through hardware or software. See cluster. See also FTP cluster,
geographic cluster, and virtual cluster. See server.
server draining
The process of allowing existing connections to a server to complete while not allowing any new connections, so that the server is
eventually not serveing any traffic. Usually done in preparation for shutting down, rebooting, or upgrading a server. On Equalizer,
server draining is enabled using the quiesce server option.
server endpoint
An IP address-port pair that identifies a physical or virtual server on the internal network to which Equalizer can route connection
requests. See server.
server response time
The length of time for the server to begin sending reply packets after Equalizer sends a request.
server weight
A value that indicates the relative proportion of connection requests that a particular server will receive. See dynamic weight,
server, initial weight, and weight.
session
A logical connection between a server and a client that may span a series of individual client requests and server responses (i.e.,
transactions). Depending on the application, a session may also span multiple client-server connections as well as transactions.
Session data is typically maintained using cookies inserted into client requests and server responses, by Equalizer, servers, or
both. Session data may also be maintained on clients and servers. Equalizer uses cookies at Layer 7 and a sticky timer at Layer 4 to
provide server persistence; the cookie lifetime or sticky time to set on Equalizer is determined by the application, and should usually
match the corresponding cookie or session timeouts set on the real servers in a cluster.
SFP and SFP+
SFP+ is the new version which supports 10Gb throughput. Stands for "Small Factor Pluggable transceiver". A port with which a
number of different network cables to be used, including regular 'copper' cables, or 'fiber' (optical) cables.Fiber-optic uses a glass
cable to send light signals, and copper users a metal (copper) cable to send electrical signals.
site
An Envoy site is part of an Envoy geocluster. It points to an existing virtual cluster on an Equalizer running Envoy.
source IP-based persistence
When a TCP SYN packet is received, a load balancer looks for hte source IP address in its session table. If an entry is not found, it
treats the user as "new" and selects a server based on the load balancing algorithm. to forward the packet. The load balancer also
makes an entry in the session table. If an entry for this source IP address is found in the session table, the load balancer forwards
the packet to the same server that received the previous connection for this source IP address regardless of the load balancing
algorithm.
Source NAT
This inbound address translation feature allows Equalizer to substitute one of it's own IP addresses for the requesting clients IP
address.
Source Routing
Source routing allows a sender of a packet to partially or completely specify the route the packet takes through the network. In con-
trast, in non-source routing protocols, routers in the network determine the path based on the packet's destination.
862 Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.