H.A. Fulcrum (tm) Load Balancing Software
H.A. Fulcrum Load Balancing Software is a software-only load balancing solution that distributes transactions between servers.
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Supported Technologies
AIX,
HP/UX,
Linux,
SCO UNIX/PC UNIX,
Silicon Graphics IRIX,
Solaris/Sun OS,
Windows XP/2000/NT
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Additional Product Information
H.A. Fulcrum@#153; Load Balancing Software is a software-only load balancing solution that helps network designers and administrators manage growing server clusters by distributing transactions between servers. One server in the server cluster functions as the "load balancer," running software that accepts incoming transactions and routes them to the least-busy server. The other servers in the server cluster function as "agents," running software that communicates with the "load balancer" server to accept and process transactions.
H.A. Fulcrum, which will be available for release later in 2002, handles load balancing between servers. It consists of three sets of software:
- The H.A. Fulcrum Load Balancer Server Component is installed on the server that handles incoming transactions; this software is written in C language and Java and distributes the workload between servers in the server cluster.
- The H.A. Fulcrum Agent Server Component is installed on each server that processes transactions in the server cluster; this software is written in Java and monitors the workload on the server and reports that workload to the Load Balancer Server Component at regular intervals.
- The H.A. Fulcrum Control Center User Interface Software is installed on a workstation connected to the load balancer server; this software is written in Java and provides a graphical user interface to configure and manage the load balancing software.
The benefits of this product include:
H.A. Fulcrum enables network administrators to get the most out of server resources by providing a comprehensive load balancing solution that intelligently balances the transaction load between all servers in the cluster. It can be configured to meet the needs of large and small networks and provides customers who need secure, encrypted transctions with support for SSL technology. Since it is a software-only solution, H.A. Fulcrum is the least expensive solution of its kind and can run on most existing hardware platforms, unlike other solutions.
There are two versions of the H.A. Fulcrum Load Balancing Software:
- The Messages Redirected version establishes communication with the incoming client, queues the incoming packets, and then redirects the message to the least-busy server. If all servers are busy at that instant, the Load Balancer can keep the message in its queue and route the message as soon as a server is available.
- The Packets Redirected version does not establish a connection with the incoming client, but instead immediately redirects the incoming packet to the least-busy agent server in the server cluster and changes the IP address specified in the packet to match that of the server where the packet has been routed. In addition, the Load Balancer sets up a table entry with that client's IP address and the agent server's IP address, so it knows how to route subsequent packets. If an agent server happens to be busy at the instant a packet is received and rejects the packet, the Load Balancer passes that rejection back to the client so the client can re-send the packet.