Load Balance Method

Description

Consistent Hash IP

• Maps client requests to real servers by hashing the source IPs of the request.
• Client/Server relationships are maintained across ports.

Insert Cookie

• Inserts a tracking cookie into the request.  Session data contained within the cookie is used with subsequent request to send traffic back to the same real server.
• Persistence is hard-coded on a per-session basis.
• Cookie expires after the client’s browser is closed.
• Requires that the client accepts cookies to be effective.

Least Connections

• The real server with the fewest number of active connections gets first priority.
• Algorithm requires a difference of 10 connections, which may skew results for customers

Persistent IP

• Ties the source IP of the requester to the real server that processes the request by a hash of all 4 octets of the requesting IP address.
• Persists for 60 minutes

Round Robin

• Each new request is assigned to the next real server in the rotation.
• Balanced distribution occurs over large samples, though small samples may display a disproportionate balance.

Shortest Response

• Server with the shortest response time receives the request.
• As load and response time increases, slower servers begin to field fewer requests.

Round Robin with Persistent IP

• Each new request is assigned to the next real server in the rotation.
• Requester’s IP address is tied to the real server, resulting in subsequent requests from the IP to be assigned to the same real server.

Round Robin with Insert Cookie

• Each new request is assigned to the next real server in the rotation.
• The load balancer inserts a cookie into the request and uses the session information from the cookie to direct traffic to the same real server for subsequent requests.

Least Connections with Persistent IP

• Each new request is assigned to the real server with the least number of active connections at the moment.
• Requester’s IP address is tied to the real server, resulting in subsequent requests from the IP to be assigned to the same real server.

Least Connections with Insert Cookie

• Each new request is assigned to the real server with the least number of active connections at the moment.
• The load balancer inserts a cookie into the request and uses the session information from the cookie to direct traffic to the same real server for subsequent requests.

Shortest Response with Persistent IP

• Each new request is assigned to the real server with the shortest response time.
• Requester’s IP address is tied to the real server, resulting in subsequent requests from the IP to be assigned to the same real server.

Shortest Response with Insert Cookie

• Each new request is assigned to the real server with the shortest response time.
• The load balancer inserts a cookie into the request and uses the session information from the cookie to direct traffic to the same real server for subsequent requests.