NetBackup™ for VMware Administrator's Guide
- Introduction
- Required tasks: overview
- Configuring RBAC roles for VMware administrators
- Notes and prerequisites
- VMware vSphere privileges
- Managing VMware servers
- About VMware discovery
- Add VMware servers
- Change resource limits for VMware resource types
- Configuring backup policies for VMware
- Backup options on the VMware tab
- Exclude disks tab
- Configuring a VMware Intelligent Policy
- About the Reuse VM selection query results option
- Use Accelerator to back up virtual machines
- Configuring protection plans for VMware
- Malware scan
- Instant access
- Instant rollback
- Continuous data protection
- Backing up virtual machines
- VM recovery
- VMware agentless restore
- Restoring Individual files and folders from VMware backups
- Using NetBackup to back up Cloud Director environments
- Recover VMware Cloud Director virtual machines
- Restore virtual machines with Instant Recovery
- Protecting VMs using hardware snapshots and replication
- Best practices and more information
- Troubleshooting VMware operations
- NetBackup logging for VMware
- Snapshot error encountered (status code 156)
- Appendix A. Configuring services for NFS on Windows
- About configuring services for NFS on Windows 2012 or 2016 (NetBackup for VMware)
- Appendix B. Backups of VMware raw devices (RDM)
How the NetBackup Accelerator works with virtual machines
To enable acceleration of virtual machine backups, click Attributes tab.
on the policySee Configure a VMware policy.
The NetBackup Accelerator creates the backup stream and backup image for each virtual machine as follows:
If the virtual machine has no previous backup, NetBackup performs a full backup and uses VMware Changed Block Tracking to track the data in use for each vmdk.
At the next backup, NetBackup identifies data that has changed since the previous backup. Only changed blocks and the header information are included in the backup, to create a full virtual disk backup.
The backup host sends to the media server a tar backup stream that consists of the following: The virtual machine's changed blocks, and the previous backup ID and data extents (block offset and size) of the unchanged blocks.
The media server reads the virtual machine's changed blocks, the backup ID, and information about the data extents of the unchanged blocks. From the backup ID and data extents, the media server locates the rest of the virtual machine's data in existing backups.
The media server directs the storage server to create a new full image that consists of the following: The newly changed blocks, and the existing unchanged blocks that reside on the storage server. The storage server may not write the existing blocks but rather link them to the image.