AccessGrid.org

Introduction

The following guide has been designed to help users install the Access Grid software on Scientific Linux 6. It has been assumed that you will setup your display and audio devices yourself, as this guide will not cover this process in detail, as it varies from system to system, though some information is provided.

This guide has been designed so that both Linux proficient and non-proficient users are able to install the Access Grid software on Scientific Linux 6. It has however been assumed that your video/audio devices are working and supported by Scientific Linux. If, once you have installed Scientific Linux 6 and you try to use the Access Grid software and you think that the display/audio isn't working correctly, we recommend you manually update your video/audio drivers or send an email to the Access Grid mailing list asking for assistance. Information regarding the Access Grid mailing lists can be found at http://www.accessgrid.org/mailinglists.

This guide has been divided into sections to help you navigate your way through the document. If you already have Scientific Linux 6 installed, running and updated, you may wish to skip down to the "Installation of the Access Grid Software" section.

This installation guide has instructions on how to setup the Access Grid Toolkit on both single and multi-machine node configuration. A single machine configuration is where you have one system which handles the entire workload. This type of configuration is generally used if you have a single capture device and connect to small AG sessions. A multi-machine node configuration is where multiple systems spread the workload for the running of an Access Grid. You may use one machine for each of the following functions, or use a combination of machines to perform the duties below:

  • Capture of video
  • Production of video
  • Managing of audio 

This implementation of a multi-machine type of node configuration is recommended if you have multiple capture devices and may participate in very large "virtual" meetings. With the recent release of the HD (H.264 and Mpeg) Codec’s and the computation requirements for both decoding and encoding each high quality video stream, the use of a mutli-node configuration will assist with spreading the computation load.

It should be noted that it is quite common for the functionality of display and audio to be performed on a single node, as the CPU requirements for capturing and sending audio is quite minimal. Systems, such as those at CQUni, utilise two computer systems for room based Access Grids, a "Capture" machine that performs the video capturing and transmissions of video and a "Display/Audio" hybrid machine to perform the other duties of an Access Grid. Therefore, when the terminology of an audio system is mentioned, it could also be referencing the display system as they are the same machine.

Additional information

For more information on Scientific Linux, it is suggested to visit the following websites:

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