Error -3047 (Disk inactivity threshold not met)


What is a Disk Inactivity Threshold

Open File backup requires a period of inactivity on the source volume?s disk (disk inactivity threshold) in order to accurately copy open files. Disk inactivity threshold is the amount of time Retrospect waits for the source disk to be idle in order to proceed with Open File Backup. When the threshold is reached, Retrospect waits again until the retry timeout occurs. The default threshold is 5000 milliseconds.


  1. You can often solve this problem by reducing the default threshold from 5000 to a smaller number. This option can be found in Options>More Choices>Open File when editing your script.

    Experiment with the Disk inactivity threshold and Retry timeout options to determine optimal values. A lower disk inactivity threshold increases the chances that it will be met, but also increases the possibility of data inconsistency. A higher disk inactivity threshold decreases the chances that it will be met, but also decreases the possibility of data inconsistency.

    Start by changing the threshold from 5000 to 4000. If the error continues, try setting the value to 3500 followed by trying 3000.

  2. Schedule scripts that use Open File Backup during off-peak hours.

  3. During Open File Backup, disable or stop applications on the source volume?s disk that could increase disk activity, e.g. antivirus software, disk defragmentation software, etc.

  4. Turn off "Protect Multi-Volume Datasets" if possible. If you do not have databases which span over multiple disks, then you should go to Options>More Choices>Open File when editing your script and uncheck this option.

  5. If you are using Retrospect 6.5, visit  www.retrospect.comand update to the latest version of the Retrospect application and client software.

Tip – Perform thorough testing of Open File Backup before using it on production systems. Every environment is unique and it is important to ensure your data is backed up accurately and completely. Do a complete backup and restore of volumes containing open files. Check for data integrity and application functionality on the restored volume. Optimize your environment, scheduling, and Open Files options to maximize disk inactivity.

Last Update: 2012年02月14日