Applies To:
  • CitectSCADA 1.00, 1.01, 1.10, 1.11, 1.20, 2.00, 2.01

Question: The disk drive failed on my standby Trend server. I installed a replacement disk and restarted the Trend Server. However, the trend files did not get copied from the primary to the standby. 

Under this condition, Citect will not copy the data from one trend server to another. When no trend files exist, Citect will create the trend files starting from the current time. Citect is assuming you are starting the trend server for the first time. We also decided that if you have lost the trend files Citect should not copy the data from one trend server to another as this could be a massive amount of data. This would cause large delays and complicate the operation of the trend server for this one off special case. It was decided under this case that it is best to manually copy the trend files from one server to another server.

You should copy the trend files yourself from the primary to the standby trend server. It is much better to copy the files (with the File manager) before you start the Trend server. You can copy only the trend files if they are stored in the same directory. For example if the trend files are stored in C:\CITECT\DATA on the primary server, they must also be stored in C:\CITECT\DATA on the Standby server.

If the trend server you are coping the files from is running, it will be updating the trend files. In this case you should copy all the *.HST files first, then the *.001 .. *.999 files. This will keep the trend data in a valid state.