and also Do remember SLES and RHEL do not support Multipathing if you are looking for SAN transport method. only Windows backup host is supported.
from the same above tech note.
multipathing with SAN transport
NetBackup for VMware on Windows supports multiple SAN paths between the
vSphere ESXi storage and the NetBackup for VMware agent (backup host). Multiple
paths can provide SAN I/O high-availability and higher backup throughput.
With a Linux backup host, NetBackup for VMware is unable to support
multipathing, because of incompatibilities in the following: the Linux operating
system, VMware vStorage APIs for Data Protection, and vendor-specific DMP
solutions.
As a result, NetBackup for VMware cannot support multipathing with a Linux
backup host that is on any of the following platforms:
■ NetBackup 52x0 Appliance
■ NetBackup for VMware on SLES
■ NetBackup for VMware on RHEL
Support for multipathing with Linux backup hosts may be included in a future
release.
Note the following:
■ This issue does not affect NetBackup support forVMware’s Native Multipathing
(NMP). NMP is multipathing between the ESXi host and storage.
■ This issue does not affect NetBackup for VMware on Windows backup hosts.
The Windows OS has integrated multipathing support. The following Microsoft
guide contains more information: