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Veeam Backup & Replication Help Center  > User Guide >  Overview > Backup > Transport Modes

Transport Modes

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Efficiency of a backup job and time required for its completion in many respects depends on the transport mode. Transport mode is a method that is used by the Veeam transport service to retrieve VM data from the source host and write VM data to the target destination.

For data retrieval, Veeam Backup & Replication offers the following modes (starting from the most efficient):

Direct SAN Access
Virtual Appliance
Network

The Veeam transport service responsible for data retrieval runs on a backup proxy server. Correspondingly, the transport mode can be defined in the settings of the backup proxy that performs the job. When configuring backup proxy settings, you can manually select a transport mode or let Veeam Backup & Replication select the most appropriate mode automatically. If you use automatic mode selection, Veeam Backup & Replication will scan backup proxy configuration and its connection to the VMware infrastructure to choose the optimal transport mode. If multiple transport modes are available for the same proxy, Veeam Backup & Replication will choose the mode in the following order: Direct SAN Access > Virtual Appliance > Network.

For writing data to the target destination, Veeam Backup & Replication normally uses the Network mode. In some cases, such as VM replication or full VM recovery, Veeam Backup & Replication also supports the Virtual Appliance mode. You cannot select the transport mode for writing data — Veeam Backup & Replication selects it automatically, based on the backup proxy configuration. Whenever possible, the Virtual Appliance mode is used.

For all transport modes, Veeam Backup & Replication leverages VMware vStorage APIs for Data Protection (VADP). VADP can be used with VMware vSphere 4  and 5 (including ESX/ESXi), vCenter Server 4, VMware Virtual Infrastructure (ESX/ESXi 3.5 and VirtualCenter 2.5). VADP is not supported for ESX 3.0.

Applicability and efficiency of each transport mode primarily depends on the type of datastore used by the source host (local or shared), and on the backup proxy server type (physical or virtual). The table below shows recommendations for installing the backup proxy, depending on the storage type and desired transport mode.

Production Storage Type

Direct SAN Access

Virtual Appliance

Network Mode

Fiber Channel (FC) SAN

Install the backup proxy on a physical server with direct FC access to the SAN.

Install the backup proxy on a VM running on an ESX(i) host connected to the storage device.

This mode is not recommended on 1Gb Ethernet, but works well with 10Gb Ethernet.

Install the backup proxy on any server on the storage network.

iSCSI SAN

Install the backup proxy on a physical or virtual server.

NFS Storage

Not supported

Local Storage

Not supported

Install the backup proxy on a VM on every ESX(i) host.

Install the backup proxy on any server on the storage network.

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