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Monitor Point Archiving

The Antenna Control Computers (ACCs) monitor approximately a thousand different Monitor Points which are transmitted back to the control building, and logged in the area AT$DATA (on one of the NOEL disks). This uses approximately 25MBytes (50 000 blocks) of diskspace each day.

The files are named AT$DATA:YYMMDD.MP*

In the current regime, data is archived and deleted each Wednesday. The past week's data is archived and the previous week's data deleted. (Thus, by the Wednesday, there will usually be 2 weeks worth of Monitor Point Data on the disk.)

Steps:

  • If possible, Wait 'till the start of the next UT day.
  • Ensure that all files have been properly closed. (If NOEL is shut down, files are not (always) properly closed)
    • $ dir/siz=all at$data:9*
    • If the two sizes are not cloce to the same (within 5 blocks), set the end of file marker to the end of the file with:
      $ set file/end_of_file _filename_
  • In AT$DATA: execute the archive procedure:
    $ @mparchive
    (The default answers should be ok)
  • Clean up the disk by executing the procedure del.com that is generated by the archive procedure.

If you do run out of disk space on $1$dka100: delete the oldest file(s) which should have been archived in the previous week.

Original: Robin Wark (20-Dec-1995)
Modified: Robin Wark (20-Dec-1995)