One of the new features in Windows Server 2012 Hyper-V Clustering is the support for Incremental backup of CSV volumes without going into redirected mode or having to read all data before changes to the Data Protection Manager server.
The changed block filter for Hyper-V was added in Data Protection Manager 2012 for stand alone hosts and help speed up backup of Hyper-V guests, with Windows Server 2012 we now have the same feature supporting clusters
CSV features in Windows Server 2012 that help achieve a seamless backup experience for both backup applications and backup requestors include the following:
- Support for incremental backups
This post will cover the Incremental Backup support , this is just one of the new features that just work but is very very helpful
First off to compare with a Windows 2008 R2 Cluster
CSV Volume going into redirected mode for the duration of the backup
There is a lot of disk activity as we are doing a rescan of the virtual machine to read changes
Windows Server 2012 Version
There is little to no disc activity
For this small test it was 2 Hyper-V guest doing close to nothing and about same data size
28-40 seconds for the Hyper-V 2012 backup and almost no additional load on the cluster
and about 5 times longer for the Windows 2008R2 Cluster with redirected mode and slow disk IO to follow.
Thank you Windows Server 2012 !