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Values no longer compressed after restarting OPC interface

Question asked by FLeonard on Jun 25, 2018
Latest reply on Jun 26, 2018 by afaulkner

The PI Server is using archive files at a rate 5 to 7 times faster than usual: archive Lifetime has dropped down, and Add Rate has increased. Here is what I can say so far:

 

  • Values no longer compressed after restarting OPC interface
  • Difference between timestamps of 2 consecutive data points is equal to advise scan rate
  • Difference between values of 2 consecutive data points is smaller than CompDev
  • Problem started within a minute of restarting the interface
  • Compression ratio is down to 4-5 % (was 75 % before incident)
  • 2 instances of PI-OPC interface running on node. Only one is affected
  • Interface configuration was not changed. Its BAT file dates back to 2011
  • Tags appeared configured correctly
  • No tag was edited the day the problem started

 

I am stumped, and looking for ideas to fix the problem. Thank you all.

 

François

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