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Does buffered data last through an interface server reboot?

bbalian8122

In the following situation:

- The historian server with the data archive is shut down at 1:30 PM

- The server hosting an interface with buffering enabled is rebooted at 1:35 PM

- The historian server is powered on at 1:40 PM

Would the data that had been buffered from 1:30 to 1:35 be lost, or would it be written to the historian server when the historian server was eventually powered on at 1:40 PM? I know that data from 1:35 PM to 1:40 PM would only be buffered if disconnected startup is enabled.

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    ​, that was my expectation as well, but when we did this same sequence of events, we found that all data after 1:30 was lost. All indications were that buffering was working properly, but it seems that when the data archive is not available, buffered data (cached snapshot records) are stored in local memory and periodically written to the disk. But if the server running the interface is shut down before the buffered data in local memory is written to the disk, that data will be lost.

    In this case, for example, the buffered data from 1:30 to 1:35 was stored in local memory and lost upon server reboot.

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    ​, that was my expectation as well, but when we did this same sequence of events, we found that all data after 1:30 was lost. All indications were that buffering was working properly, but it seems that when the data archive is not available, buffered data (cached snapshot records) are stored in local memory and periodically written to the disk. But if the server running the interface is shut down before the buffered data in local memory is written to the disk, that data will be lost.

    In this case, for example, the buffered data from 1:30 to 1:35 was stored in local memory and lost upon server reboot.

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