据报道，当对运行Samba的NAS 设备^{(NAS device)}（备份到网络共享）执行Windows 备份时，失败并显示错误消息 —备份失败，版本不支持此版本的文件格式 (0xC03A0005)^{(The backup failed, The version does not support this version of the file format (0xC03A0005))} . 这篇文章将分享它发生的时间、原因以及解决问题的解决方案的详细信息。

版本不支持此版本文件格式，0xC03A0005

出现此问题的原因是与由Windows 备份^{(Windows Backup)}创建并在此过程中装载的VHD 文件^{(VHD file)}发生冲突。这里有三种类型的VHD文件——

1. 固定的，
2. 可扩展（稀疏），和
3. 差异化。

如果VHD文件是原生VHD驱动程序不支持的稀疏文件，则挂载将失败，您将收到此错误。一个示例VHD文件是根据备份大小不断扩展的文件。

该问题仅发生在  文件级^{(File Level)}备份（卷中的文件/文件夹）的情况下，但不会出现在块级备份的情况下，因为 vhd 文件从未挂载。但是，在File Level Backup的情况下，vhd 是由Windows Backup创建的，它不支持安装稀疏文件。

唯一可行的解​​决方案是在 smb.conf 文件中使用 Strict Allocate: 选项

使用SSH登录到SMB。使用位于/etc/samba/smb.con f 的 VI 编辑器打开配置文件。如果该选项不存在，您可以手动添加strict allocate = yes这将确保没有创建稀疏文件。

这个选项有什么作用？

据官网^{(official website)}介绍，

When this is set to yes the server will change from UNIX behavior of not committing real disk storage blocks when a file is extended to the Windows behavior of actually forcing the disk system to allocate real storage blocks when a file is created or extended to be a given size. In UNIX terminology this means that Samba will stop creating sparse files.

您还可以通过手动挂载来测试VHD文件是否为稀疏文件。

打开磁盘管理工具^{(Disk Management tool)}并单击“操作”，然后单击“附加 VHD”，然后指定 vhd 文件的路径。如果错误与备份的错误相同，则这是因为文件稀疏。

我希望这篇文章很容易理解，并且您能够解决与Windows备份到NAS相关的 0xC03A0005 错误代码。

The version does not support this version of the file format, 0xC03A0005

It has been reported that when performing a Windows Backup to the NAS device (backup to a network share) that is running Samba, fails with an error message — The backup failed, The version does not support this version of the file format (0xC03A0005). This post will share the details on when it happens, the reason, and the solutions to resolve the problem.

The version does not support this version of the file format, 0xC03A0005

The problem occurs because of a conflict with the VHD file that is created by Windows Backup and is mounted during the process. There are three types of VHD files here—

1. Fixed,
2. Expandable(Sparse), and
3. Differencing.

If the VHD file is a sparse file that is not supported by the native VHD driver, the mounting will fail, and you will get this error. An example VHD file is, one that keeps expanding depending on the backup size.

The problem occurs only in the case of  File Level backup (file/folders in a volume) but not on the block level backup as the vhd file is never mounted. However, in the case of File Level Backup, the vhd is mounted, created by Windows Backup, which does not support the mounting of sparse files.

The only viable solution is to use Strict Allocate: option in the smb.conf file

Login to SMB using SSH. Open the configuration file using the VI editor located at /etc/samba/smb.conf. If the option is not there, you can manually add strict allocate = yes which will make sure there are no sparse file that is created.

What does this option do?

According to the official website,

When this is set to yes the server will change from UNIX behavior of not committing real disk storage blocks when a file is extended to the Windows behavior of actually forcing the disk system to allocate real storage blocks when a file is created or extended to be a given size. In UNIX terminology this means that Samba will stop creating sparse files.

You can also test if the VHD file is a sparse file by manually mounting it.

Open the Disk Management tool and click “Action” and then “Attach VHD” and then specify the path of the vhd file. If the error is the same as you get for the backup then it is because of the sparse file.

I hope the post was easy to follow, and you were able to resolve the 0xC03A0005 error code related to Windows backup over to the NAS.

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