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Hyper-V Live Migrationwith Windows Server 2012Lionel Shaul – Senior Instructor / Corporate Infrastructure Manager
What is Migration?• Migration is moving a VM from one host to another• Migration can be done when the VM is either powered on or off.
Live Migration• Live Migration implies the VM is moved to another host withoutbeing powered off.• The VM is inaccessible for a very short period of time (on the order ofmilliseconds)• VMware calls this vMotion.
Quick Migration• Quick Migration was Microsoft’s predecessor to Live Migration.• The VM was actually powered down, moved and then powered up.This process occurred over a period of seconds.
Why is the speed of the migrationimportant?• If the migration occurs quickly enough, applications on the VM willnot time out.• This will allow the migration of VMs during regular business hours.• VMware has done this for years.• VMware does load balancing of hosts using vMotion. It is called DRS,Distributed Resource Scheduling.• Only the most anal of IT shops restrict vMotion to outside of businesshours.
Recommended Setup for LiveMigration• Windows Server 2012• Failover Cluster• VMs installed as a role on the cluster• Shared storage for the cluster members• CSV (Cluster Shared Volumes) to store VMs
Shared Storage• Can use FC (fibre channel), iSCSI or SMB 3.0• Windows Server 2012 can be both an iSCSI Target and Initiator• iSCSI is less expensive to implement than FC.• NFS is not supported for Failover Clustering.• SMB 3.0 is relatively new, many SANS may not yet support it.• RemoteDMA nics employing infiniband are very fast, (40 +Gbs) andcan support SMB 3.0. Watch for their prices to drop.
CSV Cluster Shared Volumes• As the name applies, CSV are cluster aware.• CSVs permit multiple hosts to access the file system simultaneously.• This eliminates the need to have each VM on a separate LUN.• VMware’s file system, VMFS, has always had this functionality
Let’s build our demo and test it out.• Join our hosts to the domain• Install the Hyper-V role on the hosts• Create an iSCSI target• Connect to the shared storage via the iSCSI initiator• Install the Failover Cluster feature and create a cluster• Add a VM to the cluster• Compare and measure the speed of different migration methods.
Available CoursesHyper-V for Windows Server 2012• Configuring and Administering Hyper-V in Windows Server 2012 (3 days)Hyper-V for Windows Server 2008• Implementing and Managing Microsoft Server Virtualization (5 days)