NetBackup supports several transport modes for sending snapshot data between the VMware datastore and the VMware backup host during a backup or restore. One of those transport modes (hotadd) is used when the VMware backup host is installed in a virtual machine.
Note the following about the hotadd transport mode:
For a list of VMware restrictions on the hotadd transport mode, refer to VMware's documentation. For example:
The VMware backup host must be installed in a virtual machine.
The following is a VMware requirement: The virtual machine to back up and the virtual machine that contains the hotadd backup host must reside in the same VMware datacenter. The same VMware requirement applies to virtual machine restore: The virtual machine to restore and the virtual machine that contains the hotadd restore host must reside in the same VMware datacenter.
For hotadd backup, Symantec recommends at least one hotadd backup host for each datacenter.
NetBackup does not support IDE disks on the virtual machine.
On the virtual machine to back up, no two disks should have the same name. (Identical names can occur if the disks reside on different datastores.)
The ESX server (where the backup-host virtual machine resides) must have access to the datastore of the virtual machines that you want to back up.
The datastore for the backup-host virtual machine must have some free space before the hotadd backup begins. Otherwise, the backup may fail.
Theoption does not work with the hotadd transport mode in the following case: The virtual machine that contains the backup host is a clone of the virtual machine that is backed up (or vice versa). In this case, a backup that uses the hotadd transfer mode may appear to succeed. However, some of the virtual machine volumes may be incorrectly mapped and cannot be restored.
The converse is also true. The virtual machine that you back up with the hotadd transport mode cannot be a clone of the virtual machine that contains the backup host. Furthermore, the two virtual machines must not be clones of the same parent.
VMware has identified this issue as software defect SR#1442259141. To use the hotadd transport mode with your backup, do the following: Make sure the virtual machine that contains the VMware backup host and the virtual machine you back up are not clones of each other.
On a Windows Server 2008 or later backup host (proxy) with the hotadd transport mode, set the Windows SAN policy to onlineAll.
For more information on this issue and on other VMware hotadd issues, see the following VMware Knowledge Base article: