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But today in CloudStack, we lack the capability to understand i.e. parse and manipulate OVA format. And hence offloading the import job to hypervisor and using the results (information about additional disks) provided by the hypervisor will be simpler and reliable.

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Limitations

• Certain OVA restrictions that will continue to hold true
  • All Data disk should be of device type SCSI
    
    • In CS all data disks are by default of device type SCSI
  • OVA package should not contain ISO disk
    • In case the OVA package contains an ISO then we will error out when a VM is deployed using the template because we use vCenter to gather info about the OVA 
  • All NIC devices present in the OVA need to point to default network ‘VM Network’ as most of vCenter installations will have it.
• The above OVA restriction is because in CS we don't edit or map the NICS in the OVA to CloudStack networks and also cannot configure the controller type for data disks

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