View the data storage information

TIP:
You must have administrator privileges to modify the data storage information.
The data storage service in FactoryTalk Historian ME monitors the NAND flash-based storage used in the module.
To view the data storage information
  1. Click the
    Configure Historian
     tab, and then click
    Data Storage
    .
    The
    Data Storage
    page appears.
  2. Review the following for additional information.
Use this section
To
Archive Statistics
View the information on the current usage of the disk space allocated to the archive.
Archive Information
View the following information on the archive:
  • Total Archive Files
    The number of archive files.
  • Transferred Archives
    The number of archive files transferred to a Historian SE or PI server.
  • Available Archives
    The number of archive files that do not have any data stored in them. These files are available before they are overwritten.
  • Archive File Size
    The size of a single archive file. It is fixed and it equals 10 MB.
    The FactoryTalk Historian ME module has 130 preallocated archive files.
Event Queue
View the number of temporary files in a transient state. The module processes the files as soon as it archives events in the files. Usually, the event queue count should be less than 3.
Note:
When the count gets bigger, it may cause the archive disk to reach its threshold. In such case, the data collection will be automatically stopped and data interruption will occur.
You may set a warning level for the archive disk usage in the
Archive Disk Threshold Configuration
 box to prevent this situation.
Log Threshold Configuration
Set a threshold for the log files disk usage. The default setting is 95%.
When the log storage reaches its threshold, FactoryTalk Historian ME deletes older log files and logs the following message on the
System Log
 page:
<Log file name and path> has been removed because the /mnt/log partition is full.
Archive Disk Threshold Configuration
Set a threshold for the archive disk usage. The default setting is 95%.
When the archive disk reaches its threshold, FactoryTalk Historian ME performs the following actions:
  • Stops the data collection and logs the following message on the
    System Log
     page:
    Stopping Data Collection because one or more partitions are full.
    Stopping the data collection allows the module to process events from transient event files to archive storage and make more storage space available.
  • Deletes a message log file located under
    /mnt/appdata/dat
    , and logs the following message on the
    System Log
     page:
    <File name and path> has been removed because the /mnt/appdata partition is full.
Active Usage Threshold Configuration
Set a warning and critical thresholds for the data disk usage, with the following default settings:
  • 50% for the warning.
  • 75% for the critical level.
For the critical level setting, choose either of the following options:
  • Select the
    Stop Data Collection
     check box, if you want the data collection to be automatically stopped when the critical level is reached.
    With this setting, you may lose data, because it is no longer being collected.
  • Clear the
    Stop Data Collection
     check box, if you do not want the data collection to be automatically stopped when the critical level is reached.
    With this setting, you may risk data interruption, because the data collection service will start overwriting the oldest data, once all archive files are filled.
    This is the default setting.
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