Getting Correlator Data Back From the Tapes.
Introduction.
Almost all correlator data is reduced on line. However sometimes you
might wish to reprocess it, the calibration may not have been possible
or wasn't done very well. Or you might want to reprocess the data with
more or less sub-bands, longer integrations or whatever.
To reprocess the data you need to have successfully identified the
tape it is on. Then, you grab the relevant Exabyte. A copy of all of
these are kept at Epping.
To successfully reduce a correlator observation of a pulsar you need
to establish if the cals need to be reprocessed. If they do locate
the nearest Hydracal at the same frequency and bandwidth as your
pulsar observation and get it off tape. Once they are off tape
unload the pulsar observation and a nearby cal - preferably the
one before the observation.
Recipe.
- Grab the appropriate tape and stick it into an Exabyte.
- cd to the directory where you want the data to go.
- Then type:
tape2disk device tape_number start_file end_file
- For Example:
tape2disk /dev/nrst4 54 5 11
- This will take off files 5 to 11 on tape 54.
- There is an additional argument that you can give and only files containing
that pulsar will be taken off. ie
tape2disk /dev/nrst4 22 1 100 0437-4715
will only take off the 0437-4715 files on tape 22.
- You are now ready to reduce your data.
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CSIRO - Australian Science, Australia's Future
15-Dec-95 - Dick Manchester
(rmanches@atnf.csiro.au)