Backup and Restore

Windows Server 2012 Beta introduce some new features to improve the function of backup and restore. Replica is such a new capability to enable organizations to implement an affordable Business Continuity and Disaster Recovery solution for virtualized workloads.

Hyper-V Replica in Windows Server 2012 Beta

Hyper-V Replica provides a virtual machine level replication solution which efficiently replicates data over a LAN/WAN to a remote(Replica) site without relying on software or hardware technologies outside of the Windows Server 2012 Beta. At a very high level, Hyper-V Replica is summarized in the following:
Replica.png
In this solution, training cloud lab VMs are located as high available VMs on cluster storage volumes of cluster(ShuttleCluster01.training.lab). Once replication is enabled, and they should specify another cluster server(ReplicaCluster01.training.lab) as replica server. As both primary server and replica server are in same domain, the network traffic of sending/receiving replica uses Local Area Network(LAN). The architecture of replica design in Training Cloud solution shows bellow.
Replica02.png
VMs is running on primary site(ShuttleCluster01) and deliver replica log at intervals of some time. Even the VM on primary site is destroyed, then the backup on replica site will failover it and still run to provide services for user. Thus, replica server(ReplicaCluster) site become primary one, and the original primary server(ShuttleCluster01) acts as backup now.

Snapshots

Hyper-V snapshots create recovery points for a virtual machine so that it can be returned to a previous state later if needed. They can save time and allow an administrator to revert the system’s state to a previous point in time when all was set well, avoiding sometimes-painful tap restores.
In file system level, snapshot is another kind of differencing disk, saved as format “.avhd”. When a snapshot is created, a file with postfix “.avhd” is generated and applied by Hyper-V, this “.avhd” file will increase constantly and save user’s operation on the VM.
Snapshot provides an easy way to restore to the previous system point, there are 14 demos in our lab environment, so creating 14 snapshots that saving all the demos. Jumping around snapshots will provide expierence of switching lab demos at any time for users. At the same time, applying snapshots will also reduce storage space cost, since only one set of the VMs will support the whole 14 demos.

Last edited May 25, 2012 at 2:50 AM by xinwenting, version 3

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