Transfer type

If you use VCB for the backup, these options require ESX server 3.5 or later and VCB 1.1 or later.

The transfer types determine how the snapshot data is sent from the VMware datastore to the VMware backup host. The appropriate option depends in part on the type of network that connects the VMware datastore to the VMware backup host.

san

For unencrypted transfer over Fibre Channel (SAN) or iSCSI. This value is the default.

nbd

For unencrypted transfer over a local network that uses the Network Block Device (NBD) driver protocol. This type of transfer is usually slower than Fibre Channel.

nbdssl

For encrypted transfer (SSL) over a local network that uses the Network Block Device (NBD) driver protocol. This type of transfer is usually slower than Fibre Channel.

try san then nbd

Provides transfer flexibility if the VMware datastore is available on both a SAN and a local network. NetBackup attempts an unencrypted transfer over Fibre Channel (SAN) or iSCSI. If that fails, it transfers the snapshot data using the Network Block Device (NBD) driver protocol over the local network.

try san then nbdssl

Provides transfer flexibility if the VMware datastore is available on both a SAN and a local network. NetBackup attempts an unencrypted transfer over Fibre Channel (SAN) or iSCSI. If that fails, it transfers the snapshot data with SSL encryption using the Network Block Device (NBD) driver protocol over the local network.

hotadd

Lets you run the VMware backup host in a virtual machine. This feature requires ESX 3.5 Update2 or later.

For instructions on this transport mode and on installing the backup host in a VMware virtual machine, refer to your VMware documentation.

try all types

This option is for vStorage backups only (not VCB). For vStorage backups, this option is the default.

NetBackup tries each transfer type in this order: san, hotadd, nbd, nbdssl. It uses the first type that succeeds for all disks in the virtual machine. For example: if one of the disks cannot be accessed using san, the san transfer type is not used for any of the virtual machine's disks. NetBackup then tries to use the hotadd type for all the disks. NetBackup continues to try each type until it finds one that succeeds for all the disks.