Several options are available for replicating virtual machines for data protection and disaster recovery in VxRail clusters. Among them are solutions integrated into the VMware software stack: VMware vSphere Replication (VR), and RecoverPoint for Virtual Machines (RP4VM), which is built on enterprise proven Dell EMC RecoverPoint technology.
When choosing the right solution, Recovery Point Objectives (RPO) is an important consideration. RPO defines the maximum acceptable age of data recovered from a replicated copy as a result of a data loss issue. For example, if a virtual machine is deleted and the RPO for the virtual machine is 24 hours, a recovered copy of the virtual machine should contain all data except for any changes that occurred in the last 24 hours. Depending on the technology, RPOs as low as a few seconds or minutes can be configured.
Another consideration is the number of recovery points to retain. When configuring replication for a virtual machine, an administrator has the option to enable the retention of multiple recovery points (point-in-time instances). This can be useful when an issue is discovered several hours, or even a few days, after it occurred. For example, a replicated virtual machine with a four-hour RPO contracts a virus, but the virus is not discovered until six hours after infestation. As a result, the virus has been replicated to the target location. With multiple recovery points, the virtual machine can be recovered and then reverted to a recovery point retained before the virus issue occurred.