SIRIS, ALTO, and NAS: Error: File System could not properly remount. Please contact Support immediately and submit a ticket



Backups fail with error: "File-System could not properly remount.  Please contact Support immediately and submit a ticket"

Figure 1: File System could not properly remount error banner


  • Datto SIRIS
  • Datto ALTO


The ZFS file system's storage volume has become unmounted on the Datto. 

Most often, this occurs if during a restore or device operation (File Restore, Screenshot, Running Virtual Machine, Bare Metal Restore) the device experienced an unexpected shutdown.


A quick solution is to simply reboot the device and see if the error persists. Alternatively please submit a ticket or call Datto Technical Support as a Datto Technical Support team member can remotely remount the volume. It is rare to have this error re-occur, if it does please reference this when contact Datto Technical Support.

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