![]() HotAdd works only with virtual machines with SCSI disks and is not supported for backing up virtual machines with IDE disks.Running the VMware Backup server on a virtual machine has two advantages: it is easy to move a virtual machine around and it can also back up local storage without using the LAN, although this incurs more overhead on the physical ESX/ESXi host than when using SAN transport mode. This is referred to as HotAdd transport mode. HotAdd: When running VMware Backup Host on a Virtual Machine, vStorage APIs can take advantage of the SCSI Hot-add capability of the ESX/ESXi server to attach the VMDKs of a Virtual Machine being backed up to the VMware Backup Host. Backup/Restore operations using NBD might hang if this limit is reached.ģ. These limits differ in different versions of vSphere - please refer to the NetBackup for VMware Admin Guide (linked below) for these limits. There is a limit on the number of NFC connections that can be made per ESX/vCenter server. You need one NFC connection for each VMDK file being backed up. VMware uses Network File Copy (NFC) protocol to read VMDK using NBD transport mode. ![]() The VMware Backup Host will need the ability to connect to TCP port 902 on ESX/ESXi hosts while using NBD/NBDSSL for backup/restores.If the VMware Backup Host has connectivity to vCenter server but not the ESX/ESXi server- snapshots will succeed but vmdk read/write operations will fail. Since the data in this case is read by ESX/ESXi server from storage and then sent to VMware Backup Host, It is must to have network connectivity between ESX/ESXi server and VMware Backup Host.If you need to protect sensitive information, you have the option of transferring virtual machine data in an encrypted form using NBDSSL. If the ESX/ESXi host and VMware Backup Host are on a private network, you can use unencrypted data transfer,which is faster and consumes fewer resources than NBDSSL.For example, you can put the VMware Backup Host in a different resource pool than the production ESX/ESXi hosts, with lower priority for backup. The VMware Backup server could be a virtual machine, so you can use a resource pool and scheduling capabilities of VMware vSphere to minimize the performance impact of backup.The ESX/ESXi host can use any storage device, including local storage or NAS.LAN transport offers the following advantages: As its name implies, this transport mode is not LAN‐free, unlike SAN transport. LAN (NBD): In this mode, the ESX/ESXi host reads data from storage and sends it across a network to the VMware Backup Host. SAN disk as read-only, except during restoresĢ. ![]()
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