6 Jul 2015

DAS-5 is now fully operational! To make room for DAS-5, DAS-4/UvA and DAS-4/ASTRON have been decomissioned, only their headnodes remain available.

28 Oct 2014

The Hadoop setup on DAS-4/VU has been updated to version 2.5.0.

30 Jan 2014

The Intel OpenCL package for Intel CPU's and Xeon Phi has been updated to version 3.2.1.

3 Sep 2013

The Nvidia CUDA development kit has been updated to version 5.5.

25 April 2013

Slides of the DAS-4 workshop presentations are now available.

14 Jan 2013

DAS-4/VU now has 8 new nodes with latest Nvidia K20 GPU.

DAS-4 Connectivity

An important innovative aspect of the DAS-4 system is the wide-area communications infrastructure between the clusters. Each cluster has 1Gbps of connectivity to the regular Internet through its local University and then on to SURFnet. To satisfy higher demands in bandwidth, transparency and latency, however, the StarPlane project collaborates with SURFnet to enable DAS-4 to use dedicated 10Gbps lightpaths across SURFnet's DWDM backbone between clusters.

DAS-4 Local Network Architecture

For external connectivity, each cluster has a LAN connection to the local university and a direct WAN connection to SURFnet. The head node and the cluster nodes connect to the LAN with Ethernet interfaces: 1 Gbit/s Ethernet for the cluster nodes and 10 Gbit/s Ethernet for the head node. We are particularly interested in the WAN connectivity to the SURFnet6 network, as it provides lightpaths through the optical infrastructure. The WAN connections go via a special router node. Both the head node and the cluster nodes use InfiniBand to connect with the local router.