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== Preparing the Experiment Disk Images ==

This experiment will use several disk images, which we have already prepared for you. On this page, we describe how the disk images were prepared.

We started by loading a baseline disk image onto a node in ORBIT's {{{outdoor}}} testbed.
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>    Try it yourself another time: To load a baseline image onto a node, e.g. node1-2 on ORBIT's {{{outdoor}}} testbed, run [[br]]
>    {{{omf load -i baseline.ndz -t node1-2.outdoor.orbit-lab.org}}}
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Then, on the server node, we installed the Apache HTTP server, and configured it to serve the MPD (Media Presentation Description) file for a DASH-encoded version of the Big Buck Bunny animated video ([[http://www-itec.uni-klu.ac.at/dash/?page_id=207 source]]), as well as the actual video segments. The MPD file describes the location and parameters for every version ("representation") of a video segment, and is used by the client to decide what file to request from the server for each segment of video.

On the client node, we installed the OML-enabled version of VLC with DASH support already ([[http://witestlab.poly.edu/svn/listing.php?repname=omlapps&path=%2Fvlc%2F source]]). (We did this three times, for each of the three policies we want to evaluate, creating a new image each time).

Then we saved these disk images for later use.

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>    Try it yourself another time: To save a disk image from a node, e.g. node1-2 on ORBIT's {{{outdoor}}} testbed, run  [[br]]
>    {{{omf save -n node1-2.outdoor.orbit-lab.org}}}
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