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Preferred Image Format

VMware compatible format, such as:

    • ovf / ova (preferred format)
    • vmdk / vmx

If you are starting from a Windows physical computer, please see P2V - How to convert my Windows physical computer to a Virtual Machine for a step-by-step.

  • Currently VMware hardware version 10 images are the preferred version.
    • If older VMware hardware version images are to be provided, they will be converted to VMWare ESX by Hatsize.

Disk(s) and disk controller
  • Disk type should be set to SCSI rather than IDE
  • Disk controller recommendations:
    • If you are unsure how to convert to the recommended disk controller, our Solutions Architects will gladly provide further help.
      • Customer-specific appliance: please inquire with Hatsize
      • Linux: PVSCSI (VMware Paravirtual) - unless you are using older versions of Linux
      • Nested ESXi: LSI Logic or LSI-SAS
      • Windows: PVSCSI (VMware Paravirtual)

NIC(s) Type
  • NIC(s) Type recommendations:
    • If you are unsure how to convert to the recommended NIC type, our Solutions Architects will gladly provide further help.
      • Customer-specific appliance: please inquire with Hatsize
      • Linux: vmxnet3
      • Nested ESXi: e1000
      • Windows: vmxnet3

Windows Licensing

Hatsize will require that you license or provide licenses for your Windows environments.

We offer 2 options:

  • Bring your own licenses (acceptable licensing: Volume-licensed (VLK) or  KMS-licensable only).
  • Use Hatsize licensing services for a licensing fee (only available for Windows Server versions).

Unused Services / Applications

Do not run processes that are unnecessary for the lab.

  • By default, many operating systems have a number of servers/applications configured to auto-start. Unless these services are required, please disable them.
    • Disabling these will free up resources and allow your image to run faster (e.g. Hyper-V, apache, mysql, and MSSQL).

Fixed IP address

Hatsize will set the IP address of the server and this may affect services that have a hard coded IP address.

  • If fixed IP addresses are required, please notify Hatsize. We will create a secondary interface with this fixed IP address.
  • Alternatively, add a second interface to your system with this fixed IP address; Hatsize will require its own interface. (By default, it will run DHCP).

Screensavers and backgrounds
  • Disable screen-savers: as these systems are virtual, screen-savers merely consume valuable resources.
    • Blank backgrounds minimize resource consumption.


If you are using VNC, please ensure that it is not set to autostart.

Lab Initial Requirements Worksheet

We strongly suggest filling up the Lab Requirements Worksheet to speed up deployment of your images.

Network Diagram

For network complex lab environments, please send us a network diagram showing which NIC connect to what NIC between virtual machines.

  • Network diagram can be created:
    • with the software your choice (e.g. Visio, PowerPoint, etc.) and send to Hatsize in a user-friendly format (e.g. PDF, JPG, etc.)
    • drawn by hand, then scanned and send to Hatsize. 


This applies to situations where the customer is not sending an image to Hatsize for deployment, but would rather have Hatsize build a new image according to their specifications. Unless otherwise instructed by Hatsize Sales, the customer must provide us license keys for the operating system and all applications.


If Hatsize is to build an image from scratch, it is the responsibility of the customer to provide a complete and accurate specification for the image, please us our Lab Requirements Worksheet: Hatsize Lab Initial Requirements Worksheet.xlsx.

  • This specification should include all information necessary to install the OS and Applications including any license information needed. Minimum required information needs to include: memory and CPU requirements for the image(s) as well as a network diagram of the solution.



Updating an existing lab image


  1. Customer can use our self-service Image Management System (IMS).
    1. For more information on IMS, please see Lab Configurations - Configure SystemsVersions and/or inquire with Hatsize.
  2. Hatsize can be engaged to update an existing image. The Hatsize sales team will ensure that the appropriate paperwork has been completed prior to starting work on the image update. Work is charged on an hourly basis and must be recorded in the Customer Invoicing system.