Specifications

3 Select the migration type.
Option Description
Change host
Move the virtual machine to another host.
Change datastore
Move the virtual machine’s configuration file and virtual disks.
Change both host and datastore
Move the virtual machine to another host and move its configuration file and
virtual disks. (This option is not available for a powered-on virtual machine.)
4 To move the virtual machine to another host, select the destination host or cluster for this virtual machine
migration and click Next.
Any compatibility problem appears in the Compatibility panel. Fix the problem, or select another host or
cluster.
Possible targets include hosts and DRS clusters with any level of automation. If a cluster has no DRS
enabled, select a specific host in the cluster rather than selecting the cluster itself.
5 Select the destination resource pool for the virtual machine migration and click Next.
6 If you chose to move the virtual machine’s configuration file and virtual disks, select a disk format.
Option Description
Same as Source
Use the format of the original virtual disk.
If you select this option for an RDM disk in physical compatibility mode,
only the mapping file is migrated. If you select this option for an RDM disk
in virtual compatibility mode, the RDM is converted to a virtual disk.
Thin provisioned
Use the thin format to save storage space. The thin virtual disk uses just as
much storage space as it needs for its initial operations. When the virtual disk
requires more space, it can grow in size up to its maximum allocated capacity.
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 thin virtual disk. RDMs converted to virtual disks cannot be
converted back to RDMs.
Thick
Allocate a fixed amount of hard 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.
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 leave a disk in its original location, the disk format is not converted, regardless
of the selection made here.
Chapter 12 Migrating Virtual Machines
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