# Distributed Workloads for Replication

To restore multiple instances or VMs simultaneously, you can configure replication jobs to distribute the workload (instances or VMs) across multiple access nodes that are assigned to the destination hypervisor.

You can configure distributed workloads either in the recovery target or in a replication group created from a VM group by selecting the Automatic option for the Access node setting. The ability to distribute workloads is available for replication both from streaming backups or IntelliSnap backup copies.

## Access Node Assignment

Access node assignments vary slightly based on the cloud service provider:

Amazon: The instances are assigned to the access nodes by a region match.

Please refer to the available transport modes and select access nodes accordingly. The following modes are available:

- Commvault HotAdd: Uses Commvault HotAdd for all restores to AWS when the access node and destination are in the same zone. See, Replication Using the Commvault HotAdd transport mode.

- Amazon EBS direct: Uses EBS Direct API for cross-zone and cross-region Full VM and attach disk restores. See, Replication Using Amazon EBS Direct APIs.

- AWS VM Import/Export: Uses AWS Import/Export for cross-region VM conversions. See, VM Replication Using the AWS VM Import/Export Transport Mode.

- Azure: First, the instances or VMs are assigned to the access nodes by a region match. If access nodes are not available in the same region, then the instances or VMs are assigned using the round-robin method.

- Google Cloud: First, the instances are assigned to the access nodes by a zone match. If access nodes are not available in the same zone, then the instances are assigned to access nodes in the same region. If there is no zone or region match, the access nodes are assigned using the round-robin method.

- VMware: First, the VMs are assigned to the access nodes by a host match. If access nodes are not available in the same host, then the VMs are assigned to access nodes in the same data center. If there is no host or data center match, then VMs are assigned using the round-robin method.

The following table explains how replication operations are assigned to access nodes, based on the distributed workload setting, the location of the operation, and the type of operation performed.

Access node setting | Replicate to the same hypervisor | Replicate to a different hypervisor | Back up during failback | Replicate during failback
--- | --- | --- | --- | ---
Recovery target: Automatic Replication group: none | The access nodes in the hypervisor and VM Group are used for replication. | The access nodes on the destination site are used for replication. | The access nodes on the destination site are used for backup operations. | Both access nodes on the source site and the VM group are used for replication operations.
Recovery target: Automatic Replication group: Specific access node | The access node specified in the replication group is used for replication. | The access node specified in the replication group is used for replication. | The access node specified in the replication group is used for backup operations on the destination site. | Both access nodes on the source site and the VM Group are used for replication operations.
Recovery target: Specific access node Replication group: Automatic | The access nodes in the hypervisor and the VM group are used for replication. | The access nodes on the recovery target are used for replication. | The access nodes on the destination site are used for backup operations. | Both access nodes on the source site and the VM group are used for replication operations.

## Related Topics

- Creating a Replication Group from a VM Group

- Creating a Recovery Target

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