Problem with history services & alarm event services.
In our 800xa DCS only two physical serves are there for primary & secondary network. All our aspect server, connectivity server , IM server, PDC are virtualized. SInce last couple of days we are facing the problem such as trend of the configured object is not getting displayed although it was getting displayed earlier. It was happening in some of the OS of the plant while at the same time i was able to see the same trend in another OS. AFter this event, one day trend of all the object was not getting displayed across all OS & ES.
Hence i have restrated history services from the plant exploredr & problem got resolved as it is working till date.
Same way today i have faced the problem of all the configured object was in object error alarm state & it was not getting acknowledge from the alarm triangle as it was disable. Hence again i have restarted alarm services from the plant explorer & problem got resolved.
What could be the possible reason which is leading to such behaviour & how i can avoid it in future?
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