VMware replication creates and maintains an identical copy of a source VM on a target ESXi host. The copy of the source VM - called a VM replica - is a regular VM that is available in the VMware vSphere. VM replicas remain in the powered off state and do not consume any resources, yet you can simply power them on, in case of a disaster.
NAKIVO Backup & Replication provides the ability to replicate both individual VMs and all VMs within selected VMware containers (such as resource pools, folders, hosts, clusters, etc.). That is, all your new VMs created in or moved to a protected container are automatically added to your replication job. This way all your most critical VMs are always replicated.
With NAKIVO Backup and Replication, you can create up to 30 recovery points for a VM replica. Each recovery point is a regular VM snapshot, so if a source VM has been damaged, you can easily return the VM replica back to a previous good state even without NAKIVO Backup & Replication.
Why use VMware Replication?
VM replication can protect your business-critical services from a number of problems that can occur in a data center:
- Critical VM loss/failure due to a bad OS update, virus or accidental deletion
- Host/datastore failure as a result of a power loss, water main burst or hardware malfunction
- Natural disasters such as earthquakes, floods, tornados, hurricanes or typhoons
VMware replication creates copies of source VMs that can be stored locally or offsite, providing the ability to near-instantly fail over from the source VM to the VM replica. Thus, recovery times with VM replication are dramatically better, when compared to that of restoring from VM backups.
You can minimize the risk of data loss and the length of downtime with disaster recovery procedures built on VM replication.
Using VM replication, you can significantly reduce costs and the time needed to recover your virtual infrastructure with only a minimal interruption to your business services. Since VM replication creates an exact copy of source VMs, resuming business services is as simple and quick as powering on the VM replicas.
RPO and RTO Improvement
NAKIVO Backup & Replication enables you to improve your recovery point objective (RPO), which is the point in time that your VMs will be reverted to in case of a disaster. You can set up your replication jobs to run as often as every minute, thus obtaining a near-real-time replication and one of the shortest RPOs.
With VM replication, you can also significantly improve your recovery time objective (RTO), which is the duration of time that it should take to restore your virtual infrastructure. Because VM replicas are regular VMware VMs, recovering from a disaster can be done by simply powering on the VM replicas.
Failover and Failback
During a disaster, all of your virtual infrastructures can be failed over from the primary site to a disaster recovery site. When the virtual infrastructure at the primary site is restored, you may want to return workloads back with the failback process. Using NAKIVO Backup and Replication, you can transfer changed data back to the primary site and return to a normal business operation.
VMware Replication Features
VMware Replication Technology
NAKIVO Backup & Replication relies on VM snapshots to retrieve data and perform VM replication (Temporary snapshots are automatically created and discarded by the product). NAKIVO Backup & Replication supports sparse, thin, thick, and flat VM disk types and can replicate VMware VMs in any power state: on, off, or suspended.
The initial full replication creates a regular VMware VM that is identical to the source VM. On subsequent job runs, the product identifies changed data blocks of the source VM using the VMware CBT technology, which essentially provides information of changed data blocks since the last checkpoint. All changes made since the last replication are sent to the target ESXI host and merged into the VM replica. The previous state of the VM replica is saved as a new recovery point, which is just a regular VM snapshot.