Restore: Local Virtualization Options



This article describes the Local Virtualization options available on SIRIS appliances. For ALTO devices, see Restore: Starting a Cloud (Hybrid) Virtualization on a Datto Appliance.


  • Datto SIRIS


The Local Virtualization options page becomes available after you start a Local Virtualization. You can return to the page at any time by clicking the Recovery tab in the GUI, and then clicking the Manage Restore button. From this location, you can customize the following virtualization settings:

  • Number of CPU cores
  • Amount of RAM
  • Storage Controller
  • Network Options
  • Video Controller Options
  • Create Rescue Agent

To change the network controller, see Agent Configuration - Virtualization Options.

Local Options

Figure 1: Local Virtualization options

If the VM is running, you must click the Stop button before you can change the Local Options.

Select any option shown in Figure 1 from the index below to learn more:

  1. CPU Cores
  2. System RAM
  3. Controllers (Storage)
  4. Network Options
  5. Video Controller Options
  6. Original VM Configuration File
  7. Create Rescue Agent

1. CPU Cores

Select the number of CPU cores. This number cannot exceed the number of CPU cores that the Datto appliance has available to it. The Available Resources pane displays the number of physical CPU cores available to your appliance. 

2. System RAM

For best results, set the RAM in increments of gigabytes (1024, 2048, 3072, 4096, etc). Do not set a RAM value that is equal to or greater than the amount of RAM shown in the Available Resources pane. Leave at at least 3072 MB free to allow the screenshot process to work for other agents on the device.

If you cannot leave 3072 MB or greater free, you can disable screenshots while you are running the VM.

See the Local Virtualizations - Best Practices article for more information about allocating CPU cores and system RAM.

3. Controllers (Storage)

Choose from IDE, SATA, SCSI, or VirtIO. The storage controller value should match the configuration used on the production machine.

4. Network Options

By default, the VMs have Disconnected as the network setting to avoid accidental network conflicts with the production instance of the machine on the local network. However, if the production machine is down and you want the VM to take its place, you have the following network options:

  • Bridged to the Primary NIC
    When using this option, do not give it the same IP address as the SIRIS, as it will cause a network conflict.

  • Bridged to eth1
    Uses the secondary NIC on the Datto appliance to create a network connection. When using this option, do not give it the same IP address as the primary NIC on the SIRIS, as it will cause a network conflict. With bridged networking, the SIRIS uses a device driver that filters data from its physical network adapter. This device driver effectively creates a new software network interface that makes the VM appear as if it is physically connected to the interface via a network cable.

  • Firewalled on a private subnet
    This option configures the Virtual Machine for NAT (Network Address Translation) mode which creates an isolated virtual network with internet access for the VM on the SIRIS. This will allow the VM to have outbound access without conflicting with the production systems. The IP address will be within the range.

  • Firewalled on a private subnet, with no internet access
    This option configures the Virtual Machine for NAT (Network Address Translation) mode which creates an isolated virtual network without internet access for the VM on the Datto SIRIS. The VM will boot up with a 169 address by default as it will not be able to reach any DHCP server. Statically assign an IP address and subnet to configure two or more VMs hosted on the SIRIS to communicate with each other.

5. Video Controller Options

The Video Controller Options menu allows you to choose between VGA and Cirrus controllers. By default, VGA is selected. The Cirrus option is primarily intended for compatibility with legacy systems.

6. Original VM Configuration File

If the virtualization you create originates from a snapshot of a VMware-based host that is protected by Datto's agentless solution, you will see this option. Clicking the Download File link will save a configuration.vmx file to your computer. This file contains a copy of the protected system's virtual configuration as it existed at the time of the snapshot.

7. Create Rescue Agent

When creating a new local virtualization, the Create Rescue Agent option will be selected. When you start the virtualization, a rescue dataset of your virtualization will be created on the Protect page of the Datto appliance GUI, which your Datto appliance will use to take crash-consistent backups of the virtual machine. If you do not require backups of your virtualization, you can deselect this option. See the Restore: Create Rescue Agent article for additional information.

Connecting to the Virtualization

Figure 2: Connection options (click to enlarge)

After you configure the VM's networking options and start it, you will need to connect to the running virtualization and configure it with a static IP before it will be visible on your network. You can connect to the virtualization in the following ways:

  1. By using any VNC viewer capable of reaching the VNC address displayed (recommended)
  2. By connecting using the Connect via RDP button. When selecting this method, you will be presented with two connection options:
  • Connect using local network: Downloads an RDP session file configured to connect to the VM over the local network. This is useful if you are on the same network as the virtualization.
  • Connecting using Datto Relay: Downloads an RDP session file configured to connect to the VM remotely. This is useful if you are not on the same network as the VM.
RDP access to virtualizations requires the connecting workstation to be running Windows Server 2008 SP3 or newer.

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