On May 27 and 28 the OSDT hosted collaborators from GLEON for a series of technical meetings to discuss future system developments and plans. During these meetings we agreed to jointly develop a dedicated testbed to investigate DataTurbine performance under a number of real-world conditions, including network partitioning, intermittent connectivity, power outages, link errors, packet drops, network congestion, and multiple traffic workloads. This testbed will consist of an end-to-end observing system deployment (from buoy to field station to data center) that can be configured and stressed to investigate specific issues related to performance, reliability, robustness, and ease of use. In addition to the field deployed network and sensors, the testbed will also include synthetic data generators and a network simulator to extend the range of possible tests. The testbed will be instrumented to gather a variety of metrics including availability, reliability, throughput, one-way packet delay and loss, round-trip packet delay and loss, and jitter. This testbed will complement our existing OSDT deployments by providing a dedicated resource where system experimentation will not conflict with other site priorities. Thus we will be able to stress the system and measure performance much more extensively than is currently possible. We plan to have the testbed operational by end of July 2008.