Creating Images
Images are held in Datastores within the cluster framework and come in three varieties: Operating System, CD-ROM, and Datablock. The designation is integral for how the platform engages with the image and what the underlying media represents.
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Operating System Images(OS) are intended to represent bootable disk Images. In general, every VM Template must define one DISK as this Type of Image in order to be bootable. There are some exceptions to this; such as, VMs that network boot.
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CD-ROM Images are read-only data represented to the guest as a virtual CD-ROM device.
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DATABLOCK Images are generally used as storage for data. These Images can be created from previously existing data by importing, or as an empty drive.