Hey guys, I have a question.
What kind of backup does veeam create, transactionally consistent or crash consistent backup? what is the difference between them?
Best answer by vNote42
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Userlevel 7
+17
Both are possible with Veeam.
Application aware backups are transactional consistent. You will use them for applications like databases or exchange to be sure that the application is recoverable to a consistent state with all transactions in a defined status.
The “normal” snapshot backups are crash consistent. You will use them for all other systems and applications where it does not matter that every single action is in a defined status.
Userlevel 7
+13
You can do (I assume vSphere Backup jobs)
- Crash consistent. This happens when do not enable VMware Tools Quiescence and Guest Processing.
- Application Aware (incl. VSS). This happens when you enable Guest Processing. This is recommended by Veeam
- “VSS Aware” and Disk Quiescence. When you just enable VMware Tools Quiescence.
- Additional you can use freeze-only backups. These are Storage Snapshots-only backups without VMware Snapshots.
Userlevel 7
+9
To simplify it even further
Crash Consistent = state of the machine at the time when the VM was powered off e.g. Any data/transactions held in memory is/are lost
Transactional Consistent = Veeam instructs VM to commit data/transactions to disk, before taking the backup
?
Userlevel 3
+2
https://www.veeam.com/blog/how-to-create-a-consistent-vm-backup.html
This one is still relevant, even 7 years later..
Userlevel 7
+20
I think everyone has covered it and that blog is still very relevant.
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