Azure File Sync Diagnostics

https://learn.microsoft.com/en-us/troubleshoot/azure/azure-storage/files/file-sync/file-sync-troubleshoot

What we found was the process FileSyncSvc.exe

Was Reading every File’s $REPARSE_POINT

And writing to the heatstore.edb file

We found this is a normal case when the FileSyncSvc.exe has an unclean shutdown so needs to rebuild the DB

Side effect of mitigation:

Since heatstore DB is removed, it takes sometime to rebuild the DB during which tiering may be slow, which can result in a higher disk utilization and low tiering efficiency for a few hours. Once the rebuilding process completes, the tiering moves at its full speed. Recall of already tiered files should not be affected by this.

Investigating issues with the Azure File Sync Agent after updating to 15.1.0.0 : r/sysadmin (reddit.com)

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