Hi, Niki. CloudStack requires vSphere so it cannot manage a standalone ESXi host directly, rather it needs to go through vCenter. To import a VM to CloudStack, export the VM in OVA format, import it as a template in CloudStack, and deploy a VM from that template. CloudStack supports OVAs with only one VMDK, so if your VMs have multiple disks you will have to create multiple separate OVAs. The boot disk will need to be imported as a template, and extra disks can be imported to CloudStack as volumes (this is not possible in CS 3.0.2, so wait for 4.0.0-incubating) and attached to the VM after creating it. Alternatively, you can create blank extra disks for the VM when creating it and manually transfer it from the original VM.
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Citrix supports the open source community via developer support and evangeslism. We have a number of developers and evangelists that participate actively in the open source community in Apache Cloudstack, OpenDaylight, Xen Project and XenServer. We also conduct educational activities via the Build A Cloud events held all over the world.