Avamar: VM Image level Backup fails with 10026 Error to Data Domain

Summary: Backing up a VMware Image fails with 10026 or 10055, "Invalid length failed when overwriting to a file in a container for backup"

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Symptoms

At the end of a VM backup with Data Domain it fails with FCOW error related to change block offset:

2016-11-10 19:00:39 avtar FATAL <0000>: Failed to send data to file container for FCOW, Invalid offset failed overwriting to a file in a container for backup, changed block begin offset 133272572928 is not a multiple of the fixed segment size 8192, DDR result code: 4914, desc: Invalid offset
2016-11-10 19:00:39 avtar FATAL <0000>: <10621>Failed to overwrite data to stream, due to send data failure for size 262144 for FCOW for stream index 15, DDR result code: 0 desc: Error not set
2016-11-10 19:00:39 avtar FATAL <40009>: DDR encountered errors.
2016-11-10 19:00:39 avtar Info <9772>: Starting graceful (staged) termination, DDR_ERROR event received (fatal severity) (wrap-up stage)
2016-11-10 19:00:39 avtar Info <0000>: Entering the 'final' phase of termination, DDR_ERROR need to exit)
2016-11-10 19:00:39 avtar Info <15092>: Container final statistics:
container file name: C884337993FD57BF9CB6B44AB276E861ABA0F5F8
total seg count:     22,599,398
redundant seg count: 22,560,065
2016-11-10 19:00:39 avtar FATAL <5155>: Backup aborted due to earlier errors.  No backup created on the server.


Or 

2022-07-13 10:39:52 avtar FATAL <0000>: Failed to close file container for backup for FCOW, Invalid length failed when overwriting to a file in a container for backup, length 1677312 is not a multiple of the fixed segment size 8192, DDR result code: 4915, desc: Invalid length
2022-07-13 10:39:52 avtar FATAL <0000>: Failed closing write stream for FCOW, index: 33, close container failed, exit code: 157.
 

Cause

The disk size of the Virtual Machine has changed and caused the change block offset to no longer be a multiple of 8192 which is what is required for the FCOW to work with Data Domain.

Resolution

Configure the Virtual Machine and edit the settings.

Check each disk size for a decimal size.

Adjust the size of the disk by ROUNDING UP to the next whole number.

Example:
The disk appears as size 127999.3337 MB.
Change this to 128000 MB.

Also the goav vm validate-size command can be used to check for this issue.

For more information about validate-size feature, see the Additional Info section of this article or GoAV documentation. 

  1. Using GoAV, run the command: 

./goav vm validate-size

  1. To resize the virtual machine:

    1. In the vSphere client, locate the virtual machine.

    2. Edit the virtual machine and select the identified disk using the tool.

    3. Change the units to MB, and from the GoAV tool set the size to RESIZE TO.

  2. Start a new backup in Avamar. After the backup is complete, perform a new image restore on the latest backup to confirm the issue is resolved. 

 

See VMware KB:  https://knowledge.broadcom.com/external/article?articleNumber=377962 

    Additional Information

    More information about GoAV validate-size feature: 
    This feature detects virtual machines with virtual disk sizes that are not multiples of 8192 KB or 1,048,576 KB (1 MB). If found, it recommends a newer, larger size to increase the virtual disk. 

    ./goav vm validate-size --help
    Validate Virtual Machine disk size by checking each disk for the VM on vCenter.
    Verifies that disk sizes are properly divisible by 1 MB and 8 KB.

    Usage:
      goav vm validate-size [flags]

    Examples:
    ./goav vm validate-size --name testing8kb-invalidlength --vc myvcenter.fqdn.tld

    DEVICE KEY |                                VMDK                                 | DISK SIZE |  8 KB  |  1 MB  | RESIZE TO
    -------------+---------------------------------------------------------------------+-----------+-------+-------+------------
      2001       | [localDatastore] testing8kb-invalidlength/invalidSize.vmdk | 1536000   | false | false | 2 MB

    Flags:
      -h, --help          help for validate-size
          --hide-valid    Set output to hide valid VMs
          --name string   VM Name
          --prompt        Prompts to select vCenters
          --vc string     Vcenter Name

    Global Flags:
      -d, --debug      debug output
      -f, --force      Ignore Configuration
      -n, --noheader   Do not display header

     

    Affected Products

    Avamar

    Products

    Avamar
    Article Properties
    Article Number: 000063080
    Article Type: Solution
    Last Modified: 20 Mar 2025
    Version:  6
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