Requirements and Limitations

If you plan to use CDP to protect your workloads, consider the following requirements and limitations.


CDP is included in the Veeam Universal License. When using a legacy socket-based license, the Enterprise Plus edition is required.

Platforms and Datastores

Infrastructure Components

  • The backup server must have at least 16 GB RAM.
  • VMware CDP proxy must meet the requirements listed in section VMware CDP Proxy.
  • The network between the infrastructure components must suit the load on your infrastructure. We recommend that you use at least 100 Mbps network. Slower networks cannot handle the generated disk traffic without interruption. The better performance is proven on 10 Gbps networks or faster and MTU 9000.
  • You must configure CDP for one cluster on one backup server only. If you add a cluster to another backup server and install the I/O filter (filter required for CDP) on it, CDP policies on the first backup server will fail. For more information on the I/O filter, see I/O Filter.
  • The maximum number of CDP policies that can be created on one backup server is 100.
  • If you add a new cluster to the vCenter server after the I/O filter is installed on the existing clusters, you need to install the I/O filter manually on the newly added cluster. To do that, open the I/O Filter Management wizard, make sure that check boxes are selected near all clusters where the I/O filter must be present and finish the wizard.

Virtual Machines

  • During the initial synchronization, Veeam Backup & Replication needs double space allocation for VMs with thick-provisioned disks on the target host. After the initial synchronization finishes, Veeam Backup & Replication frees half of the allocated space for such VMs. This is a part of mechanism required to support protection of disks newly added to the source VMs.
  • The maximum number of disks attached to one VM is 50.
  • The maximum number of long-term restore points per disk is 95.
  • For VMs encrypted on VMware side, consider the following:
    • Make sure that the Allow I/O filters before encryption parameter is set to True for the VM storage policy component. For more details, see VMware vSphere documentation.
    • To create encrypted CDP policy, select the encrypted datastore at the Destination step of the wizard. For more information, see Creating CDP Policies.
    • Encryption for transaction log files that contain incremental changes for disks is not supported. For more information, see CDP Replication Chain.


  • On the target host, Veeam Backup & Replication does not allow you to migrate replicas using VMware vSphere Storage vMotion. Note that host vMotion is allowed. However, note that during failover, host vMotion is not allowed.
  • Replicas can be powered on only using the failover operation; powering on replicas manually is not supported.
  • For Veeam Backup & Replication versions prior to 12.1 (build, testing CDP replicas in Virtual Labs is not supported. Starting from version 12.1 (build, Veeam Backup & Replication supports testing. For more information, see SureReplica.

Related Topics

Backup Infrastructure for CDP

Page updated 5/28/2024

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