Micro-grids: Practical applications of grid technology to small distributed collaborations Page: 5 of 10
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Data Location and Metadata Service
The Matisse system has a global data location and metadata service that is built on a
CORBA[16] Object Request Broker (ORB) that interfaces to a back-end relational
database. The interface allows registration of experiments, and all experiment-associated
data, including CAD data, experimental runs, meta-data about the parameters used during
fabrication. Much of the information stored is meta-data or handles, which in turn point to
the real data locations through the use of URLs. This centralized name service scheme
allows the designer the ability to login and check the status of the experiments from
anywhere. It also provides for a dynamic method for the different fabrication sites to
register the results of tests, and allows for changes during fabrication.
High-Speed Network Cache
This environment generates huge amounts of data, whether it is the 'movies' generated
from the testing of a MEMS device or the volume data generated by the computation of
the phase shift in a device during a run. High-speed access to this data is provided by the
Distributed Parallel Storage System (DPSS)[8], a high-speed network cache. In the
Matisse grid there are two DPSS's -- one on each coast of the United States -- to allow
low-latency reading and writing of data from compute nodes and test facilities. A much
more common method of transferring data, the File Transfer Protocol (FTP), was rejected
because readily-available implementations of FTP have low (~8Mb/s) transfer rates on
high bandwidth-delay product networks such as the SuperNet. The DPSS, on the other
hand, can adjust its network performance based on the current network conditions, and
has been shown to provide speeds in excess of 1.5 G/sec[17], which is well above the
project's requirements.
Java Portal
Sarnoff designed a Java portal that provides integrated single sign-on access to the
entire system. Users can login through this portal and check the status of their different
projects. The portal provides the ability to share and compare the data from experiments
with other researchers. A designer can take the data from one of their experiments and
compare it against previous runs, or grant access to the data to other researchers who are
doing similar work. Manufacturers can login to the system and see if there are new
designs to waiting to be created, and the fabrication facilities have an easy way to now
upload the data from the tests that they perform. One of the more important and key
features of the portal is that it provides transparent access to all the resources through the
use of a single sign-on. Once a user logs onto the portal, they now have access to all of
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Lee, Jason R. Micro-grids: Practical applications of grid technology to small distributed collaborations, report, November 30, 2001; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc881738/m1/5/?q=%22Materials+Science+and+Engineering%22: accessed June 9, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.