9 October 2018

The next generation DAS, DAS-6, will get funding! For details, see the DAS Achievements page. DAS-6 is expected to become operational in the second half of 2020.

May, 2016

IEEE Computer publishes paper about 20 years of Distributed ASCI Supercomputer. See the DAS Achievements page.

Network setup

Internal network

Each DAS-5 cluster has both an internal 1 Gbit/s Ethernet and a FDR InfiniBand network. The Ethernet network (with IP addresses 10.141.0.<node-id>) is mainly used for management of the cluster.

The best performance is obtained using the InfiniBand network, which offers low latency and throughputs up to 48 Gbit/s (depending on the networking API used). The InfiniBand network can be accessed both via a fast native interface, typically through MPI, but also by means of the regular IP layer, using IP addresses 10.149.<site-id>.<node-id>.

External connectivity

For external connectivity, each cluster has a 1 or 10 Gbit/s ethernet connection to the local university backbone; the head node acts as a router for this purpose.

In addition, DAS-5 compute nodes will be able to communicate over a Wide-Area network based on dedicated ethernet light paths provided by SURFnet. To use this network, specify IP addresses on the internal DAS-5 OpenFlow network (10.150). This networking option is still under construction.