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Posts Tagged ‘MeteoSwiss’

Decommission of «Palu» at CSCS

Wednesday, January 27th, 2010

On January 27th, 2010 the Cray XT3 has reached the end of its life here at CSCS, for the last time the system has been shut down and disassembled.

This computer has been named after Piz Palü in the Bernina range in Graubunden, Eastern Switzerland with an elevation 3901 m and his last configuration has been the follow:

  • 6 Cabinets containing 14 service processing elements (PEs), subdivided into 7 service blades, and 548 dual core nodes giving 1096 compute PEs subdivided into 137 compute blade
  • 3 GB of Ram (Compute nodes)

Palu started its life as production system on January 2006. This computer was the very first Cray XT machine to set foot on Europe. It was the first supercomputer based on the XT architecture thatrun Catamount operating system using Infiniband as high-speed interconnect. Palu was mainly used for massively parallel jobs.

Of the 6 cabinets of Palu, two will be disassembled by Cray to be used as spare parts, one will stay at CSCS and be the first exhibit of an own museum. The last three cabinets will be shipped next week to a compter museum near to Solothurn. Stay tuned on this blog to get additional information on the museum next week…

In the next photos you may see the technician of Cray starting the disassembling of Palu (this will need almost three working days).

Disassembling of the interconnect.

The interconnect cables and removing the power supply cables.

Another view of the interconnect being disassembled:

Palu_Interconnect

Disassembling part of the compute blades to be used as spare parts.

Move of Dôle at CSCS to a New Location

Tuesday, January 26th, 2010

Today the HPC system called “Dôle” has been moved to a new location inside CSCS. Dôle is being used by MeteoSwiss as failover for Buin, the main production system for weather forecast.

Previously Dôle and Buin were placed next to each one. The replacement to two separate locations in the CSCS computer room will ensure a maximum of availability in case of any technical issue.

New computing systems at CSCS for MeteoSwiss

Friday, January 15th, 2010

CSCS is providing HPC services to MeteoSwiss for the National daily weather forecast. Since 2007 the service has been provided by Buin (a Cray XT4) as main production system and Palu (a Cray XT3) as backup system.

Palu has been decommissioned at the end of 2009 because of his high operational costs. His functionality as fail-over system is now ensured by the processors upgrade of Buin from dual-core to quad-core and then by splitting the resulting system in two distinct parts (three and two racks). The second half of the system has been named La Dôle (located in the Jura mountains in Vaud, western Switzerland). This mountain has been selected mainly because MeteoSwiss on La Dôle is operating one of the three Swiss meteorological radars (also placed on Albis and Monte Lema).

Buin

  • 264 AMD quad-core Opteron @ 2.3 GHz
  • 2.1 TB DDR2 RAM (2GB/core)
  • 4 TB System Raid
  • 30 TB Storage (Lustre file-system)
  • 7.6 GB/s interconnect bandwidth

Dôle

  • 172 AMD quad-core Opteron @ 2.3 GHz
  • 1.4 TB DDR2 RAM (2GB/core)
  • 4 TB System Raid
  • 15 TB Storage (Lustre file-system)
  • 7.6 GB/s interconnect bandwidth

Even if Dôle is smaller than Buin, it still allows to compute the weather forecast in his full resolution respecting the times as required by the MeteoSwiss operational forecast suite.

In addition to the hardware upgrade, the operating system of the two systems has been also upgraded to the latest version of CLE and the scratch file-system is now provided by an external Lustre.

The next photo depicts the Cray team intent in upgrading Buin. This consisted in replacing all 436 dual-core processors with compatible quad-core processors, doubling the memory, and finally splitting the internal node interconnect to create two separate systems.

Buind Dole Upgrade

The next generation HPC system for MeteoSwiss will be then installed in 2012 after the moving of CSCS to its new location in Lugano. We expect next generation system to be able to double the current resolution targeting a 1Km grid resolution. The computational costs of doubling the grid resolution can reasonably be estimated in a factor of ~10 in respect of today computational requirements.

Example of weather forecast produced at CSCS

In the next pciture are represented examples of forecasted extreme meteo events. The reliability and  accuracy of the forecasted meteo situation is often critical in order to alert the population and take appropriate measures in order to reduce to a minimum the damages that can be made to persons and infrastructures.

ExtremeEventIcon400

Video: Forecasted extreme meteo events

In particular being able to well estimate a correct value  of wind speed or rain quantities as early as possible (in some cases  already a few days ahead), is a must for decision makers which has to take the right protection measures.