Review the following information for recommendations and best practices when selecting a transport mode to use for virtual machine data protection operations and Tanzu Kubernetes guest cluster protection in
PowerProtect Data Manager.
Hot Add transport mode recommended for large workloads
For workloads where full backups of large sized virtual machines or backups of virtual machines with a high data change rate are being performed,
Hot Add transport mode provides improved performance over other modes. With
Hot Add transport mode, a
VM Direct Engine must be deployed on the same ESXi host or cluster that hosts the production virtual machines. During data protection operations, a
VM Direct Engine capable of performing Hot Add backups is recommended. The following selection criteria is used during data protection operations:
If a
VM Direct Engine is configured in Hot Add only mode, then this engine is used to perform
Hot Add virtual machine backups. If one or more virtual machines are busy, then the backup is queued until the virtual machine is available.
If a virtual machine is in a cluster where the
VM Direct Engine is not configured in
Hot Add mode, or the
VM Direct Engine with
Hot Add mode configured is disabled or in a failed state, then
PowerProtect Data Manager selects a
VM Direct Engine within the cluster that can perform data protection operations in
NBD mode. Any
VM Direct Engine with
Hot Add mode configured that is not in the cluster is not used.
Any
VM Direct Engine that is configured in
NBD only mode, or in
Hot Add mode with failback to
NBD, is used to perform
NBD virtual machine backups. If every
VM Direct Engine that is configured in
NBD mode is busy, then the backup is queued until one of these engines is available.
If there is no
VM Direct Engine that is configured in
NBD mode, or the
VM Direct Engine with
NBD mode configured is disabled or in a failed state, then the
PowerProtect Data Manager embedded
VM Direct engine is used to perform the
NBD backup.
Other transport mode recommendations
Review the following additional transport mode recommendations:
Use
Hot Add mode for faster backups and restores and less exposure to network routing, firewall, and SSL certificate issues. To support
Hot Add mode, deploy the
VM Direct Engine on an ESXi host that has a path to the storage that holds the target virtual disks for backup.
NOTE:Hot Add mode requires VMware hardware version 7 or later. Ensure all virtual machines that you want to back up are using Virtual Machine hardware version 7 or later.
In order for backup and recovery operations to use
Hot Add mode on a VMware Virtual Volume (vVol) datastore, the
VM Direct Engine should reside on the same vVol as the virtual machine.
If you have vFlash-enabled disks and are using
Hot Add transport mode, ensure that you configure the vFlash resource for the
VM Direct host with sufficient resources (greater than or equal to the virtual machine resources), or migrate the
VM Direct Engine to a host with vFlash already configured. Otherwise, backup of any vFlash-enabled disks fails with the error
VDDK Error: 13: You do not have access rights to this file and the error on the vCenter server
The available virtual flash resource '0' MB ('0' bytes) is not sufficient for the requested operation.
For sites that contain many virtual machines that do not support
Hot Add requirements, Network Block Device (NBD) transport mode is used. This mode can cause congestion on the ESXi host management network. Plan your backup network carefully for large scale
NBD installs, for example, consider configuring one of the following options: