Fatal I/O error on .datto: #112 on write: there is not enough space on the disk

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Scope

This article describes the cause and possible solutions for the error: Fatal I/O error on .datto: #112 on write: there is not enough space on the disk.

Background

The error code -112 is an official Microsoft System Error code for "There is not enough space on the disk."

For more information about the error code, check out the Microsoft knowledge base:

System Error Codes (0-499)

Cause

There are a number reasons this error can occur such as:

  • This is commonly seen on machines which have protected volumes that have less than 20% free space.
  • This can also appear if the Datto device doesn't have enough space to accept the backup.
  • There may be corruption in transfer of the backup image across the network.

Solution

  • Rule out any processes that are taking up large amounts of resources. Datto recommends maintaining at least 30% free space per protected volume. A minimum of 20% free space per protected volume, and 1 GB of RAM, must be available at all times on the production machine. If resources fall below these thresholds, backups will fail. Figure 1 explains utilization levels in detail.

     

     Volume Utilization

    Status

    Comments

    0 – 70%

    Good

    Utilization is good.

    71 – 80%

    Warning

    Utilization is outside optimal limits. Monitor the volume growth and look at cleaning up unnecessary files and moving non-essential data to other storage.

    81 – 100%

    CRITICAL

    Volume is becoming critical. Snapshots will start to fail, disk queue lengths will increase. Create space.

     

  • Exclude all Recovery or SRP partitions from the Advanced Options on the agent tab.
  • Check networking and other connections to the target machine.
  • This error may appear if multiple base images are running from the same protected machine.
  • Try to write a Shadow Copy of the volume as a test from the Shadow Copy or a Windows Backup to determine if the VSS writers can actively write a copy.
  • Have Datto technical support verify the device storage pool is healthy.
If none of these fix the issue, please contact Datto Technical Support for further assistance.

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