Status Report: April 2013 - September 2013

Steve Emmerson, Mike Schmidt, Tom Yoksas

Strategic Focus Areas

The LDM group's work supports the following Unidata funding proposal focus areas:

  1. Enable widespread, efficient access to geoscience data
    The LDM powers the Unidata Internet Data Distribution (IDD) system.
  2. Provide cyberinfrastructure leadership in data discovery, access, and use
    The LDM allows sites to move data in their own environments.
  3. Build, support, and advocate for the diverse geoscience community
    The LDM is used by US universities and by entities throughout the world.

Activities Since the Last Status Report

LDM 6.11.5 and 6.11.6 Released

  • Eliminated the bundled PNG and XML2 libraries;
  • Squashed bugs;
  • Improved the portability, release-engineering, and installation process;
  • Created a binary RPM for fc14.x86_64;
  • Prevented a downstream site from wasting bandwidth by accidentally making redundant or overlapping requests for data to an upstream site;
  • Prevented an upstream LDM from wasting bandwidth by redundantly feeding a downsteam site; and
  • Mitigated a denial-of-service attack on an upstream site.

Proposal for LDM-7 Approved by NSF

As a result of the success of the previous EAGER grant and an NSF solicitation, Professor Veeraraghavan (PI) and Steve Emmerson (co-PI) proposal 1340910, "Leveraging DYNES for Weather Data Distribution on Multicast Virtual Circuits", to the Campus CI Networking (CC-NIE) group of the Office of Cyberinfrastructure (OCI) of NSF has been approved by the NSF. They propose to do the following over 2 years:

  1. "Harden" VCMTP;
  2. Develop a module for the automatic management of multicast virtual circuits;
  3. Develop a multicast version of the LDM (mLDM);
  4. Integrate mLDM into the existing LDM-6 -- creating LDM-7; and
  5. Deploy LDM-7 to co-operating sites and evaluate it. The sites are: U of Virginia, UCAR, U of Wisconsin, Rutgers U, Boston U, U of New Hampshire, Colorado State U, MAX, RENCI, and Texas Tech U.

Planned Activities

Ongoing Activities

We plan to continue the following activies:

  • Support LDM users
    • Email, phone, etc.
    • Training workshops
  • Incrementally improve the LDM as necessary
  • Incorporate additional AWIPS-II-related changes into the LDM
  • Update table-driven decoding of GRIB products as necessary

New Activities

We plan to take part in the following:

  • Development of LDM-7