Backup Transport Methods

The following methods are used to transport VMware backup data:

  • SAN: Data is read directly from the storage where virtual machines reside. This is also referred to as LAN-free since no data is transferred over the network. The LUN(s) containing the virtual machine disks must be visible to the Virtual Server Agent server to support SAN mode backups. SAN mode is supported when using storage connected over Fibre Channel or iSCSI.
  • HotAdd: The Virtual Server Agent is installed on a virtual machine residing on an ESX Server. Hot-Add mode can achieve close to SAN mode performance if SAN is not available. The term Hot-Add refers to the way the backups are completed. In Hot-Add the data volumes containing the virtual machines to be included in the backup are automatically mounted to the virtual machine.
  • NAS: NAS (network-attached storage) transport mode enables the virtual server agent (VSA) proxy computer to read data directly from a network file server (NFS), without going through an ESX host or transferring data over the local area network (LAN). With automatic transport mode selection, the NAS transport mode is selected if NAS storage is connected to the ESX host. The VSA must have access to the datastore NFS volume exports that provide storage for virtual machine disks. The ESX host is contacted only to coordinate access to the NFS datastore.
  • NBD or NBDSSL: NBD (network block device) and NBDSSL (encrypted NBD) transmit data over the ESX Servers' TCP/IP connection. This can be the production network or a dedicated backup network.

See Configuring Transport Modes for more information and instructions on configuring transport modes.

Last modified: 6/24/2019 8:15:25 PM