A GSN node contains the following Special Purpose Equipment (SPE):
The SPS should include solar panels, a charge controller, an inverter and battery banks. For the WPS, the solar panels would be replaced by a wind turbine. Note that remote control and monitoring is required for either an SPS or WPS.
A typical GSN node installation is depicted in the following figure.
GSN Node Server : The server should support the Intel E5500 or later chip set. The recommended server for the GSN is the Dell PowerEdge R710 Server with the following configuration,
GSN Node PDU : A Power Distribution Unit (PDU) is required that can be accessed via the network to obtain power metrics on a per outlet basis. The recommended PDU for the GSN is the Raritan DPXR8-15 model.
Remote Control and Monitoring of the SPS or WPS : The Facility Manager component of the GSN Middleware requires the ability to monitor parameters associated with a SPS and/or a WPS. Remote control and monitoring over the network of an SPS or WPS is required. For an SPS based on Outback equipment, the MATE can be accessed over the network using the IOLAN DS1 Serial-to-IP Converter.
GSN Node Network : A GSN node is expected to connect to the GreenStar Network using a 1 Gbps LightPath (LP) across CANARIE that would be terminated at a Hub Node. The recommended L2 Switch is the Allied Telesis AT-8000GS/24 model.
GSN's infrastructure is structured into a hub and spokes topology, thereby inspiring the name Green "Star".
Hub Node : Hubs are sites where energy is always available, including hydro power or windmill farms of sufficient size such that there are no chances of having downtime. While there can be power management techniques at the hub that allows the management tools to shutdown unused infrastructure, these nodes are expected to be reachable at all times. A hub will be connected to a variety of spokes to which it can move jobs (within virtual machines) that need to be processed. In addition to computing resources and energy monitoring devices, a GSN hub node contains disk arrays required to build a shared storage for VMs.
Spoke Node: The spokes are expected to have limited availability because they are powered by renewable energy sources; they may have power grid backups, but are not expected to be always available for computing. So the resources at the end of each spoke are powered by renewable energy; jobs are moved there only when the renewable energy is available.