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  1. Modify CASA tclean() to not open cfcache in write mode.  Presumably it opens to write, if err it creates else continues.  It should test for existence, create and close if it doesn't exist and then open for read.
  2. In the meantime all SE cont jobs should utilize their own copy of the cfcache.  It would be good to have the executing scripts imply simply copy it in before starting CASA and delete it after CASA exits thus avoiding the contention without creating many copies of an other wise otherwise large directory (33GB or so). 

Step 2 successfully reduced the MDS load,.  below Below is a plot of the MDS load for the week of February 21 to 28th.  It shows the initial load reduction on the 26th when all VLASS jobs were converted to local cfcache,.  the The 27th shows a large spike while a pointed observation was testtested, the 28th shows steady state after all awproject jobs were either converted to local cfcache or stopped.

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