Define a Transport Mode in the Registry for Host-Based Agentless Backup and Restore
You can define transport mode (transfer data) for UDP agent as proxy that executes host-based agentless backup or restore job for virtual machines residing on VMware ESX server. By default, host-based agentless backup and restore uses a mode that lets host-based agentless backup and restore to optimize the performance (increase the speed) of the data transfer. However, when you want to specify a particular transport mode for backup or restore, configure the registry key described in this topic.
Note: For backup, the transport mode defined in plan takes precedence over what is defined in registry.
Host-based VM backup can execute backups using the following transport modes:
Be aware of the following considerations:
- This is an optional configuration task. By default, host-based VM backup executes backups using a transport mode that optimizes the performance of the backup operation.
- When you configure this registry key to use a specific transport mode and the mode is not available, the host-based VM backup uses an available default transport mode for the backup operation.
- You can define the transport mode for all VMs that are used for backup using the proxy server (proxy level) or define a specific VM (VM level). If you configure both the proxy server and the VM, the VM level registry takes precedence over the proxy level registry.
Follow these steps to define the transport mode at the proxy server level (applicable for both backup and restore):
- Log in to the Arcserve UDP Agent (Windows) backup proxy server.
- Open Windows Registry Editor and browse to the following key:
- Right-click VDDKEnforceTransport and click Modify on the pop-up menu to open the Edit String dialog.
- In the Value Data field, specify the transport mode that you want to use during the backup job. Specify one or more of the following values separated by ":". (For example nbd or san:nbd:nbdssl:)
- Click OK to apply the value and close the Edit String dialog.
- Open Windows Registry Editor and browse to the following key:
- Create a key named AFRestoreDll.
- Create a string value named EnforceTransportForRecovery within the AFRestoreDll key.
- Specify the transport mode that you want to use during the recovery job. (For example: "san:nbd:nbdssl")
- Example
[HKEY_LOCAL_MACHINE\SOFTWARE\Arcserve\Unified Data Protection\Engine]
hotadd
HOTADD transport mode
nbd
NBD transport mode
nbdssl
NBDSSL transport mode
san
SAN transport mode
The transport mode is defined and is used the next time when the job runs.
Note: To restore thin Virtual Machine Disks (VMDK), the non-advanced transport (LAN transport mode) mode is used by default. To enable the advanced transport mode for thin VMDK, update the registry key as shown in the following example:
[HKEY_LOCAL_MACHINE\SOFTWARE\Arcserve\Unified Data Protection\Engine]
[HKEY_LOCAL_MACHINE\SOFTWARE\Arcserve\Unified Data Protection\Engine\AFRestoreDll]
"EnforceTransportForRecovery"="san:hotadd:nbd:nbdssl"
Follow these steps to define the transport mode at the VM level (applicable for backup only):
- Log in to the Arcserve UDP Agent (Windows) backup proxy server for the virtual machines.
- Open Windows Registry Editor and browse to the following key:
- Right-click VM-InstanceUUID and select New.
- Click String Value on the pop-up menu.
- Name the new string value as follows.
- Right-click EnforceTransport and click Modify on the pop-up menu to open the Edit String dialog.
- In the Value Data field, specify the transport mode that you want to use during the backup job. Specify one of the following values:
- Click OK to apply the value and close the Edit String dialog.
[HKEY_LOCAL_MACHINE\SOFTWARE\Arcserve\Unified Data Protection\Engine\AFBackupDll\{VM-InstanceUUID}
EnforceTransport
hotadd
HOTADD transport mode
nbd
NBD transport mode
nbdssl
NBDSSL transport mode
san
SAN transport mode
The transport mode is defined and is used the next time when the job runs.