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Let me see if I can explain what I think the process is for SSAs std_calibration which I think is a DAG
- fetch - Copies data from someplace (perhaps the archive) to local storage on nmpost node.
- Then DAG node ends and data is returned to lustre.
- envoy - Copies data from lustre to local storage and runs calibration.
- Then DAG node ends and data is returned to lustre.
- convey - Copies data from lustre to local storage and then delivers is someplace.
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