Infrastructure

Problems accessing data, or data seems to have disappeared

Two things to check:

1. Have you been given access to view the data?
2. Has the data been removed due to the data retention policy?

For the first, new users to an experiment need to ask the experiment POC to add them to the experiment. After this is done, you must log out and log back in for the change to take affect.

For the second, when analysis code that used to work stops working, check to see if the xtc is visible. For example, if you are analyzing run 68 of xpptut13, take a look in the xtc directory for that experiment, i.e:

ls /reg/d/psdm/xpp/xpptut13/xtc

If the directory is visible but run 68 is not there, it maybe that the data was removed due to the Data Retention Policy. The data is still available on disk and can be restored using the Web Portal of Experiments.

If the xtc directory is not visible, make sure you are running on a node that can see the data (i.e, you are on a psana node, rather than a psdev or pslogin node). If it is still not visible, email pcds-help@slac.stanford.edu.

How do I use the LCLS batch farm?

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