STC failure occurred mid transfer. stcx.SnapshotError: HSR Commit failed after 3 attempts

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1. Scope

This article describes the cause and possible solution for the error STC failure occurred mid transfer. stcx.SnapshotError: HSR Commit failed after 3 attempts.

2. Cause

  • While running a backup, the agent was unable to commit the finalization data for the volume. The ShadowSnap agent could not query the incremental tracking state on the volume.
  • The ShadowSnap agent could not read the volume's disk headers.

2. Solution

If you have not done so already, follow the preliminary steps in the Start Here article.

  • Starting with Version 3.2.0 of ShadowSnap, this error may appear. The backup state was determined to be a failed backup requiring a differential merge to be executed in order to correct the incremental tracking state and repair the image headers.
  • The next backup after that error appears will be a differential merge.
  • This should be automatically executed by the agent. If not, we can force a differential merge by following the steps here.

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