Requirements and Limitations
CDP has a set of requirements and limitations.
The following requirements apply to CDP:
- CDP is included in the Veeam Universal License. When using a legacy socket-based license, the Enterprise Plus edition is required.
- VMware vSphere edition must be VMware vSphere Standard Edition or higher. VMware vSphere Essentials Kits editions are not supported.
- For supported platforms, see Platform Support.
- For supported source and target datastores, see Veeam CDP Source and Target.
- Cisco HyperFlex 4.5 (2a) and later can be used as a source or target only with with VMware vSphere 7.0 U2 and later. With the previous versions of VMware vSphere, Cisco HyperFlex is not supported.
- All hosts in a cluster must be of the same major version: 7.x or 6.x (6.5, or 6.7, or a combination of 6.5 and 6.7 is supported). In turn, all clusters managed by the same vCenter Server must also be of the same major version.
- The target cluster must support hardware versions of VMs on the source cluster (VMs that you plan to protect).
- VMs on the same cluster must be protected with CDP only by one backup server.
- The backup server must have at least 16 GB RAM.
- VMs that you plan to protect must not have snapshots at the moment when the CDP policy starts for the first time. Further, you can add these VMs to backup jobs that will create snapshots. However, you must not create snapshots by other means, for example, manually or by another software. This may disrupt further replication operations or cause loss of important data.
- During the initial synchronization, Veeam Backup & Replication needs double space allocation for VMs with thick-provisioned disks. 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 original VMs.
- Network between infrastructure components required for CDP must be minimum 1 Gbps. We recommend to use 10 Gbps or faster and MTU 9000.
- If you enable VM encryption on VMware site, make sure that the Allow I/O filters before encryption parameter is set to True in the Default encryption properties storage policy component.
- For VMware CDP proxy requirements, see VMware CDP Proxy.
When planning to use CDP, mind the following limitations:
- CDP works only for powered on VMs. However, for VMs with IDE hard drives you must power off VMs before the initial synchronization. This is required to apply a new storage policy to VMs. For more information, see How CDP Works.
- One VM can be processed only by one CDP policy.
- VM replicas can be powered on only using the failover operation; manual power on is disabled.
- On the target host, Veeam Backup & Replication does not allow to migrate VM replicas using VMware vSphere Storage vMotion. Note that host vMotion is supported.
- Shared disks, physical RDM and SCSI bus sharing are not supported. Note that vRDM disks are supported.
- The maximum supported number of disks for one VM is 50. The maximum number of disks for one ESXi host is 500.
- Data encryption rules do not apply to traffic between the ESXi host and VMware CDP proxy. For more information on the rules, see Enabling Data Encryption.