Home > Storage > PowerStore > Virtualization and Cloud > Dell PowerStore: VMware Site Recovery Manager Best Practices > Theory of operation
The configuration of asynchronous replication for vVol based VMs requires a remote system pair as describe in an earlier section configured for two PowerStore Model T clusters running PowerStoreOS 4.0 or later. Each of the PowerStore Clusters for vVol replication needs registration in vCenter as a storage provider. VASA 4.0 API is used to exchange information between PowerStore Cluster and the associated vCenter. The VMware Storage Policy which could be assigned to VMs in vCenter leverage the same replication rules in PowerStore Manager as used for other PowerStore asynchronous replications. Asynchronous replication for vVol based VMs also use the same snapshot based async replication technology as native block replication which is described in section native asynchronous block replication. Once a VMware Storage Policy with PowerStore replication is assigned to a vVol based VM, a replication session is created on PowerStore for VM vVol resources in the same resource group. VMware resource groups can be selected when a VMware Storage Policy is configured for a VM. VMware SRM uses these VMware resource groups to manage the protected VMs in Replication Groups. An SRM Recovery Plan controls the PowerStore replication session for vVols in a replication group during test failover, failover, and reprotection. After a VM has a VMware Storage Policy assigned, and the Resource Group is in a Replication Group with Protection Plan in SRM, a placeholder VM on destination vCenter and PowerStore is created. The storage container for placeholder VM is part of the site pair configuration in SRM.
For replication of Resource Groups on PowerStore different combinations of source and destination vVol Storage Container are possible.