Prerequisites for rehearsal operation for virtual machines
Before you run the rehearsal operation for a resiliency group, ensure that you have met the following prerequisites:
For VMware virtual machines, ensure that the datastores have enough free space for the swap files for the on-premises virtual machines and the virtual machines created by the rehearsal operation on the recovery data center. The size of the swap files is same as that of the virtual machine memory size.
For VMware virtual machines, ensure that the mapping of all the required port groups across the data centers is complete.
For Hyper-V virtual machines, ensure that the mapping of all the required virtual switches across the data centers is complete.
See Creating network pairs between source and target data centers.
Each type of replication has prerequisites and limitations for the rehearsal operation.
See Rehearse operations for Hyper-V virtual machines - array-based replication.
See Rehearse operations for VMware virtual machines - array-based replication.
It is recommended to stop or disable NetworkManager on RHEL hosts having multiple NICs. This is required if the recovery data center is AWS, Azure cloud.
If the recovery data center is in AWS, then configure a rehearsal subnet in the cloud. The rehearsal and production subnet should be in the same VPC.
If the recovery data center is in cloud, then you need to set the SAN policy to either OnlineAll or OfflineShared based on whether you have shared or non-shared disks. For more details refer to Microsoft Documentation.
If the status of the virtual machine on the recovery data center is not correctly displayed, then you need to refresh the cloud discovery or the virtualization server discovery.
When the Use Same WWN option is checked, Resiliency Platform needs to do additional storage operations to map or unmap the LUNs, swap WWNS of LUNs during the workflow and that requires extra rescans and validations. These operations are not required when the option Use Same WWN is disabled. This option can be set only for when the DR operation is invoked from Resiliency Platform. It can be reset once the DR activity is complete.
Note:
This setting is specific to recovery of virtual machines from VMware to VMware if Resiliency Platform DataMover is used and recovery of physical machines to VMware data center:
While performing the rehearsal operation, DRS automation level for the target Replication Gateway should be set to manual or it should be disabled.
More Information