About Historian Log Files

Historian creates the following types of log files:
  • The .IHA files: These files contain data about archives. They are created by the Historian server after data collection begins. By default, these files are located in the C:\Historian Data\Archives folder.
  • The .IHC files: These files contain data about Historian configuration. They are created by the Historian server. By default, these files are located in the C:\Historian Data\Archives folder.
    There are two types of .IHC files:
    • *CentralConfig.ihc: This is the master configuration file used by Configuration Manager.
    • *config.ihc: This is used by the data archiver and is generated from *CentralConfig.ihc. This is to maintain consistency between Historian versions.
  • The .LOG files: These files contain logging data (such as events, warnings, and errors). They are created by the archiver and the collectors. By default, they are located in the C:\Historian Data\LogFiles folder.
  • The .SHW files: These files contain configuration data. They are created by the archiver and the collectors. By default, they are located in the C:\Historian Data\LogFiles folder.