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- in case of network disruption between the D2000 KOM and the D2000 Server processes
- in case of failure of the D2000 Server process or the entire application server
- in case of a D2000 upgrade
The KOM Archive functionality for the D2000 KOM process is activated by /KA<ArchivSize> and /KX command line parameters. The /KA parameter enables the KOM Archive functionality and the parameter ArchivSize is the size of the archive file in megabytes Megabytes (between 1 and 400). The /KX parameter enables the operation of the the D2000 KOM process after a loss of communication with the D2000 Server. An optional parameter /KM defines the method for sending values from the KOM archive after a connection with the the D2000 Server is established.
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The D2000 KOM processes started in this way are connecting to the HOT server. One of them is active and the other one is passive - it acts as if it was connected to the STANDBY D2000 Server. After the current D2000 Server becomes unavailable or STANDBY, the D2000 KOM processes attempt to connect to a new HOT server. When all servers are unavailable, the D2000 KOM processes stay in the same state as they were before the D2000 Server became unavailable (one is active and the other one is passive).
A problem can occur , when something happens to the active D2000 KOM process (the other D2000 KOM process is not notified and stays in the STANDBY state till it is reconnected to the D2000 Server).
Another problem is starting the D2000 KOM process when no server exists - the D2000 KOM process is automatically transferred into the active state as mentioned above.
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