vSphere and vSphere with Operations Management
VMware vSphere Replication is a hypervisor-based, asynchronous replication solution for vSphere virtual machines. It is fully integrated with VMware vCenter Server and the vSphere Web Client. vSphere Replication delivers flexible, reliable and cost-efficient replication to enable data protection and disaster recovery for all virtual machines in your environment.
- Data protection locally, within a single site
- Disaster recovery and avoidance between two sites
- Disaster recovery and avoidance to a service provider cloud
- Data center migration
Build Flexible Configurations
vSphere Replication provides flexible recovery options, ensures consistent application and virtual machine data, and it integrates with the VMware product stack.
- Customize the recovery point objective (RPO) from 15 minutes to 24 hours
- Use multiple point–in-time (MPIT) recovery to revert to previous known states
- Protect up to 2,000 virtual machines per vCenter Server environment
- Use Microsoft Volume Shadow Copy Service (VSS)
- Use Linux file system quiescing
- Automate cross-site disaster recovery with VMware vCenter Site Recovery Manager
- Protect virtual machines in the cloud using VMware vCloud Air Disaster Recovery service
- Protect and recover virtual machines on VMware Virtual SAN
- Protect and recover virtual machines on vSphere Virtual Volumes datastores
Eliminate Storage Lock-In
vSphere Replication is a hypervisor-based replication solution that operates at the individual virtual machine disk (VMDK) level, allowing replication of individual virtual machines between heterogeneous storage types supported by vSphere. Because vSphere Replication is independent of the underlying storage, it works with a variety of storage types including VMware Virtual SAN, vSphere Virtual Volumes, traditional SAN, NAS, and direct-attached storage (DAS). This allows you to:
- Use differing storage technologies at opposite sites (e.g. SAN to Virtual SAN, FC to iSCSI)
- Repurpose older storage at the recovery site to reduce cost
- Use secondary storage only for protected virtual machines, not the entire environment
Reduce Network Bandwidth
vSphere Replication copies only changed data to the recovery site to lower bandwidth utilization, improve network efficiency and enable more aggressive recovery point objectives (RPOs) than a manual, full-system copy. With vSphere Replication, you can:
- Utilize a “seed copy” of virtual machine data for the initial synchronization to reduce the amount of time required to create the initial copy
- Ensure efficient network utilization by tracking changed disk areas and replicating only those changes
- Optionally enable data compression to further reduce network bandwidth consumption
Hypervisor-Based Virtual Machine Replication
vSphere Replication is a deeply integrated VMware vSphere component—it is a robust “hypervisor-based” virtual machine replication engine. Changed data in the virtual machine disk(s) for a running virtual machine at a primary site is sent to a secondary site. There, the changes are applied to the virtual machine disks of the offline copy (replica) of the virtual machine.
vSphere Replication includes an agent built into vSphere and one or more virtual appliances that are deployed using vSphere Web Client. The agent tracks and sends changed data from a running virtual machine to a vSphere Replication appliance at a remote site; the appliance then adds the replicated data to the offline replica copy for that virtual machine. The vSphere Replication virtual appliance also manages and monitors the replication process, giving administrators visibility into virtual machine protection status as well as the ability to recover virtual machines with a few clicks.
It’s easy to configure replication for up to 2,000 virtual machines using vSphere Web Client: select one or more virtual machines, right-click on a virtual machine, and define the RPO and destination for its replica. vSphere Replication will then replicate data to meet the RPO at all times, ensuring that virtual machine content never ages past its defined replication policy. RPOs range from 15 minutes to 24 hours and can be configured on a per–virtual machine basis.
Virtual Machine Synchronization and Seed Copies
vSphere Replication will do an initial full synchronization of the source virtual machine and its replica copy. If desired, a seed copy of data can be placed at the destination to minimize the time and bandwidth required for the first replication. A seed copy of a virtual machine consists of a virtual machine disk file that can be positioned at the target location. A seed copy is manually created and placed at the recovery location using any mechanism the administrator chooses, such as offline copying, FTP, an ISO or a virtual machine clone.
After the initial full synchronization is complete, vSphere Replication will transfer only changed data. The vSphere kernel tracks unique writes to protected virtual machines, identifying and replicating only those blocks that have changed between replication cycles. This keeps network traffic to a minimum and allows for aggressive RPOs.
The virtual machine replication process is non-intrusive and takes place irrespective of the type of operating system or applications in the virtual machine. It is transparent to protected virtual machines and requires no changes to their configuration or ongoing management.