I thought /datasets was where all the raw data live at NCSA and then the butler repository in /repo/main links directly to the files in /datasets. We do that so that we don't end up with copies of raw data in the butler.
For example:
$ butler query-datasets --show-uri /repo/main --where "exposure.day_obs = 20150404 and instrument = 'DECam'" raw
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type run id band instrument detector physical_filter exposure URI
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---- ------------- ------------------------------------ ---- ---------- -------- -------------------------------- -------- --------------------------------------------------------------------------------------
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raw DECam/raw/all c645cc09-a3bf-5840-a8de-e51b8b1d8dae i DECam 1 i DECam SDSS c0003 7835.0 1470.0 428622 file:///datasets/decam/_internal/raw/saha_bulge/20150404/c4d_150404_051900_ori.fits.fz
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raw DECam/raw/all c452b0c1-f6d4-59c2-836a-78ffba113d1a i DECam 2 i DECam SDSS c0003 7835.0 1470.0 428622 file:///datasets/decam/_internal/raw/saha_bulge/20150404/c4d_150404_051900_ori.fits.fz
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raw DECam/raw/all 08242881-8eb4-5728-8de6-52129d11ca76 i DECam 3 i DECam SDSS c0003 7835.0 1470.0 428622 file:///datasets/decam/_internal/raw/saha_bulge/20150404/c4d_150404_051900_ori.fits.fz
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raw DECam/raw/all 6375dff5-e6e8-5b45-9131-c245e1436a61 i DECam 4 i DECam SDSS c0003 7835.0 1470.0 428622 file:///datasets/decam/_internal/raw/saha_bulge/20150404/c4d_150404_051900_ori.fits.fz
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So I think the README should be explaining what data are in /datasets – that directory is not deprecated.
Ian Sullivan is there someone in alert production who can write a quick readme for DECam data?