GridSAM

From NGSWiki

GridSAM is a Web service for job submission that uses the JSDL specification from OGF. Its evolution is tracking the development of the OGSA-BES specification, also from OGF.

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GridSAM instances configured for NGS resources

This would be a great place to report the endpoints (and versions) of managed GridSAM instances that have been configured for NGS resources.

The set of GridSAM instances operated by the Belfast e-Science Centre for the NGS is described at: [1] (http://www.ngs.ac.uk/sites/belfast/gridsam.html)

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User Comments on GridSAM

As of May 2007 and Version 2.0, GridSAM is buggy and unreliable. Use with caution.

One serious error is the inability to host multiple GridSAM instances from a single OMII container. The cryptic, user hostile error message that indicates you are having this bug is

GridOx:


   Fails on gridox: GridSAM state is: failed
 Time: 2007-05-14T18:17:07.519+01:00
 Description: cannot initialise working directory: Could not connect to FTP server on"gsiftp://grid-compute.oesc.ox.ac.uk/ - User globus credential is required but not specified in the context".

GridMan:

   GridSAM state is: failed
 Time: 2007-05-14T18:18:17.579+01:00
 Description: cannot initialise working directory: Could not connect to FTP server on"gsiftp://grid-compute.leeds.ac.uk/ - User globus credential is required but not specified in the context".

GridSAM state is: failed

 Time: 2007-05-14T18:20:21.696+01:00
 Description: cannot initialise working directory: Could not connect to FTP server on"gsiftp://grid-data.man.ac.uk/ - User globus credential is required but not specified in the context".

even though you know your X.509 certificate is valid. You'll see this error on 3 of the 4 core NGS nodes, but it'll work on one node.

The developers of GridSAM say:

" This is a known issue with the Globus DRMConnector. At present we believe that it is due to a "feature" in the Globus COG kit. For some reason it appears to create a number of (different) class loaders which it uses in different parts of the code. This breaks when you try to have more than one instance of the COG kit in memory at the same time. A workaround was published on the GridSAM web page (http://gridsam.sourceforge.net/2.0.0/gridsam-service/gt2.html) though it doesn't seem to work in every case.

Best of luck

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