Select a disk format.
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Same format as source
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Use the format of the original virtual disk.
If you select this option for an RDM disk in either physical or virtual compatibility mode, only the mapping file is migrated.
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Thin provisioned format
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Use the thin format to save disk space. The thin virtual disk starts small and at first, uses only as much disk space as it needs for its initial operations. When the virtual disk requires more space, it can grow to its maximum capacity and occupy the entire datastore space originally provisioned to it.
Only VMFS datastores version 3 and later support virtual disks in the thin format.
This option is not available for RDMs in physical compatibility mode. If you select this option for a virtual compatibility mode RDM, the RDM is converted to a virtual disk. RDMs converted to virtual disks cannot be converted back to RDMs.
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Thick format
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Allocate a fixed amount of disk space to the virtual disk. The virtual disk in the thick format does not change its size and from the beginning occupies the entire datastore space provisioned to it.
This option is not available for RDMs in physical compatibility mode. If you select this option for a virtual compatibility mode RDM, the RDM is converted to a virtual disk. RDMs converted to virtual disks cannot be converted back to RDMs.
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Disks are converted from thin to thick format or thick to thin format only when they are copied from one datastore to another. If you choose to leave a disk in its original location, the disk format is not converted, regardless of the selection made here.
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