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VEEam pipe efficiency
- Source — the source disk reader component responsible for retrieving data from the source storage.
- (2) Proxy — the backup proxy component responsible for processing VM data.
- (3) Network — the network queue writer component responsible for getting processed VM data from the backup proxy and sending it over the network to the backup repository or another backup proxy.
- (4) Target — the target disk writer component (backup storage or replica datastore).
- Unlike traditional backup tools designed to work with physical machines, Veeam Backup & Replication is built specifically for virtual environments. It operates at the virtualization layer and uses an image-based approach for VM backup. To retrieve VM data, no agent software needs to be installed inside the guest OS. Instead, Veeam Backup & Replication leverages ESX snapshot capabilities. When a new backup session starts, a snapshot is taken to create a cohesive point-in-time copy of a VM including its configuration, OS, applications, associated data, system state and so on. Veeam Backup & Replication uses this point-in-time copy to retrieve VM data. Image-based backups can be used for different types of recovery, including full VM recovery, VM file recovery,Instant VM Recovery, file-level recovery and other.
- Use of the image-based approach allows Veeam Backup & Replication to overcome shortfalls and limitations of traditional backup (such as, the necessity to provide guest OS credentials for every VM, significant resource overhead on the VM and hypervisor during the backup process, management overhead and so on). It also helps streamline recovery verification and the restore process — to recover a single VM, there is no need to perform multiple restore operations. Veeam Backup & Replication uses a cohesive VM image from the backup to restore a VM to the required state without the necessity for manual reconfiguration and adjustment.
VEEam backup file stores and backup file types
- Full backup (.vbk) to store copies of full VM images
- • Backup increment (.vib or .vrb) to store incremental changes to VM images
- • Backup metadata (.vbm) to provide information on the backup job, VMs in the backup, number and structure of backup files, restore points, and so on. The metadata file facilitates import of backups or mapping of backup jobs to existing backups.
a method that is used by the Veeam transport service to retrieve VM Data from the source host and write VM data to the target destination.
Direct SAN Access
The Veeam transport service responsible for data retrieval runs on a backup proxy server. Correspondingly, the transport mode can be defined in the settings of the backup proxy that performs the job. When configuring backup proxy settings, you can manually select a transport mode or let Veeam Backup & Replication select the most appropriate mode automatically. If you use automatic mode selection, Veeam Backup & Replication will scan backup proxy configuration and its connection to the VMware infrastructure to choose the optimal transport mode. If multiple transport modes are available for the same proxy, Veeam Backup & Replication will choose the mode in the following order: Direct SAN Access > Virtual Appliance > Network.