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Windows 2012 Hyper-V VM replication August 15, 2012

Posted by vbry21 in Windows 2012 Hyper-V.
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One of the new features of Windows 2012 Hyper-V is a feature called Hyper-V Replica.

This feature enables the administrator to replicate a single virtual machine over WAN or LAN to another Hyper-V host.

Hyper-V replica enables you to have two instances of a single VM residing on different hosts, one VM is the primary or live and the other is the replica or offline copy.

The copies are synchronised and you can failover at any time, however the failover will incur minimal downtime.

In order to support this technology Windows 2012 uses the following components.

Replication Engine: It manages the replication configuration details and handles the initial replication, delta replication, and failover and test failover operations.

Change Tracking: Tracks changes that are happening on the primary copy of the virtual machine.

Network Module: Provides a secure and efficient way to transfer virtual machine replicas between the primary host and replica host.

Hyper-V Replica Broker Role: This new role in Windows 2012 is configured in Clustering; it enables you to have Hyper-V replica functionality even when the VM being replicated is highly available and can move from one cluster node to another. The role redirects all VM specific events to the correct node in the replica cluster. The Broker queries the cluster database to determine which node should handle which events. This therefore ensures that all events are directed to the correct node in the cluster in the event that a VM migration was executed.

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