Migration fundamentals

Cold Migration: Moving a powered-off virtual machine to a new host. Optionally, you can relocate configuration and disk files to new storage locations. You can use cold migration to move virtual machines from one datacenter to another.

Migrating a Suspended Virtual Machine: Moving a suspended virtual machine to a new host. Optionally, you can relocate configuration and disk files to new storage location. You can migrate suspended virtual machines from one datacenter to another.

Migration with vMotion (a.k.a. live migration): Moving a powered-on virtual machine to a new host. You cannot use vMotion to move virtual machines from one datacenter to another. Some configurations include Metro vMotion, a feature that enables reliable migrations between hosts separated by high network round-trip latency times. Metro vMotion is automatically enabled when the appropriate license is installed. No user configuration is necessary.

Both migration of a suspended virtual machine and migration with vMotion are sometimes referred to as “hot migration”, because they allow migration of a virtual machine without powering it off

Migration with Storage vMotion

Moving the virtual disks or configuration file of a powered-on virtual machine to a new datastore. Migration with Storage vMotion allows you to move a virtual machine’s storage without any interruption in the availability of the virtual machine.

You can move virtual machines manually or set up a scheduled task to perform the cold migration.

Virtual Machine Configuration Requirements for vMotion

A number of specific virtual machine configurations can prevent migration of a virtual machine with vMotion.

The following virtual machine configurations can prevent migration with vMotion:

  • You cannot use migration with vMotion to migrate virtual machines using raw disks for clustering purposes.
  • You cannot use migration with vMotion to migrate a virtual machine that uses a virtual device backed by a device that is not accessible on the destination host. (For example, you cannot migrate a virtual machine with a CD drive backed by the physical CD drive on the source host.) Disconnect these devices before migrating the virtual machine.
  • Virtual machines with USB passthrough devices can be migrated with vMotion as long as the devices are enabled for vMotion.
  • You cannot use migration with vMotion to migrate a virtual machine that uses a virtual device backed by a device on the client computer. Disconnect these devices before migrating the virtual machine.

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.

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One thought on “Migration fundamentals

  1. Storage vMotion was alien in 2007 for the aboriginal time. We’ve apparent a lot of improvements over time to the appearance accompanying to VM clearing technologies. Accumulator vMotion allows an active VM to be confused from one abstracts abundance to addition abstracts store. My accumulator convenance about sees me application VMFS volumes for vSphere VMs, but NFS is additionally accurate for Accumulator vMotion.

    vmotion storage

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