|Grid Access at Nevis||This is a description of the procedure to get access to ATLAS-related files on the DOEGrids.|
Each individual user who wants access to the files on the USATLAS and CERN grids must gain permission to do so. There's no Nevis-wide approval or script -- you must do it on your own.
The procedure to access files on the Grid breaks down into two phases: a lengthy one-time set-up procedure, and the commands you must issue every time you wish to access the Grid.
Warning: the initial set-up takes time. You should allow 2-3 days to make your way through the bureaucracy of approvals. If you're consulting this page because you need to access files right away, the best advice I can give you is to ask someone who already has Grid access to get the file for you.
The steps to set up Grid access are:
You must do this from a web browser that can handle certificates. Most modern web browsers can do so; if you use a text-based browser or you're still using Mosaic you'll have a problem.
By following the directions on that page, you'll import your certificate into your web browser, then export it and convert for use by Globus.
Be careful when you assign the passwords for your certificate. For example, you'll need the "export password" every time you type the globus-proxy-init command as described below. If you forget your passwords, there's nothing anyone can do; you may have to re-export or re-request a certificate (depending on which password you forget). I advise you to use the same password as your login.
Of course, if you're strict about security, you should use different passwords -- but don't say you weren't warned!
After reading the information referenced on these pages, you'll finally be asked to fill out a registration form.
We have not installed Globus at Nevis. Instead, we use the installation at BNL. This means that you need to use a machine with AFS to issue the following commands:
The last command above will copy the Grid file Y01345.9.al to /tmp/testcopy on your local machine.
Here's more documentation on the globus-url-copy command. The complete Globus documentation may also be useful.
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