Restore: Export Image

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Background

This article discusses the Export Image option via the Restore tab on the SIRIS web interface.

If you are restoring to a Generation 2 Hyper-V virtual machine, you must use the Bare Metal Restore process. Image Export is not compatible with Generation 2 Hyper-V virtualizations.

Export Image

The Export Image option is the preferred method for restoring systems in a virtual environment. We provide a few different formats and methods for image exports.

First, select the destination for the export:

Network Share: Allows for an image to be exported via CIFS/Samba or NFS. All image files are always thin provisioned on the Datto. However, if the tool used to copy the image files to local storage does not accommodate thin provisioning, they will be copied as thick provisioned. Therefore, make the appropriate storage considerations when copying files to a virtual host or other destination.

USB (SIRIS only): Allows for an image to be exported to an attached USB drive. These are thick provisioned, or can be expanded to the maximum size of the attached disk.

From here, you can select your format. The Time Requirements listed below represent the amount of time your Datto appliance will need to create the export, not the amount of time it will take to transfer the export to your hypervisor.

When restoring a virtual machine, you must attach boot.vmdk as the first drive in the boot order, and C.vmdk as the second drive.

VMDK-linked: Raw disk image with VMDK pointer file.
Files produced: A single-drive system results in 4 files; boot.datto, boot.vmdk, C.datto and C.vmdk. When restoring a virtual machine, you must attach boot.vmdk as the first drive in the boot order, and C.vmdk as the second drive.
Time Requirement: Instantaneous

 There are two reasons to add a boot and a C volume:

  • Devices do not support UEFI, so if the os volume is GPT, this is necessary.

  • It fixes virtualization failures for some MBR/BIOS agents. if the NTFS bootstrap code (used for booting) for the C:\ filesystem is corrupted, The production agents do not notice because windows uses a 'system reserved' partition for booting by default.

VMDK: Compacted complete VMDK image (supports resizing and other advanced VMFS features).
Files produced: A single drive system results in 2 files; boot.vmdk and C.vmdk. When restoring a virtual machine, you must attach boot.vmdk as the first drive in the boot order, and C.vmdk as the second drive.
Time Requirement: Up to 15 minutes for 256 GB.

VHD: Converted raw to VHD.
Files produced: A single drive system results in 2 files; boot.vhd and C.vhd
Time Requirement: Instantaneous

VHDx: Compacted complete VHDx image
Files produced: A single drive system results in 2 files; boot.vhdx and C.vhdx
Time Requirement: Up to 7 minutes for 256 GB.

For volumes larger than 2TB, a VHDx image export is required, as VHD virtual disk files do not support volumes larger than 2TB. Regardless of whether VHD or VHDx is selected, image exports currently only support MBR boot, and cannot be used to create a second generation Hyper-V VM. All image exports destined for Hyper-V must be set up as first-generation VMs.

If none of the protected host's volumes exceed 2TB, you can use either VHD or VHDx. VHD is a quick export process and takes up very little array space. A VHDx export is a full image conversion and will take longer to complete. It will require the full size of the selected backup to be free on the Datto device;s array. This array space will be unavailable until the image export is destroyed after the recovery is complete.

Export via Network Share

After selecting these options, the Windows Share page should look similar to this:

Export via USB Drive

If selecting Export to USB drive, select your choice of format and follow the onscreen instructions.

Restore using your Export

If using VHD / VHDx export, then there are two paths to restoration, depending on the target.

For XenServer:

For Hyper-V:

For VSphere:


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