VCP 4 prep objective 7.4 – Migrate virtual machines

Objective 7.4 – Migrate virtual machines

Identify compatibility requirements

Cold migrations

no concerns over CPU compatibility, shared storage is not a requirement but downtime is required.


At least advanced licence is required, shared storage, identical network configuration per host, gigabit ethernet for the vMotion vNIC, CPUs must be of the same family, NX/XD (No Execute and Execute Disable) and instruction sets must be consistent i.e. masked or exposed (EVC can help with this), ESX/ESXi version must be 3.5 or newer, CPU virtualisation extensions enabled, locally mapped CD and or floppy will not pass validation, mapped internal vSwitches will failed validation, CPU affinity cannot be set.


At least advanced licence is required, no snapshots in place, virtual disks mist be persistent, only RDM in virtual compatibility mode can be migrated (this is only the pointer not the underlying data), source and destination datastores must be accessible from the source host, two simulateous svMotions can occur by default, four is the maximum.

Cite the three methods of virtual machine migration

The three defined above!

Determine migration use cases

Moving what? Downtime toleranted? migration method
VM state no vMotion
virtual machine yes cold migration
virtual machine files no svMotion
virtual machine files yes cold migration
virtual machine files and registration no svMotion then vMotion as series operations

Compare and contrast migration technologies

svMotion can be used to convert a virtual disk to or from a thin or thick provisioned format, changes the datastore used.

vMotion is used to move a running virtual machines state from one host to another.

Powered off and suspended virtual machines can be migrated across datacenters, vMotion and svMotion cannot. Cold migrations can also be used to simulateously change datastore and host; though running svMotion then vMotion will result in the same without downtime.

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