Are Hyper-V 2012R2 checkpoints Application data consistent? How does it use now VSS during checkpoints creation?

Are Hyper-V 2012R2 checkpoints Application data consistent? How does it now use VSS during checkpoints creation?
I read the article http://www.aidanfinn.com/?p=15759 that now WS2012 R2 Hyper-V changed how it performs backups.
That is unofficial info. I can't find any info about that in msdn, but that is critical.That is about data integrity.
Is this true?
Does this mean that we may not use VSS in Hyper V server backup application any more? Will Hyper-V 2012R2 host (WM is running) when i am creating a checkpoint,
call VSS to only flush VSS Writers during this process for target child VM to make application data crash consistent state? And the volume shadow copy wn't be used? Only vhdx +avhdx witch will merged later, right?

There are a couple levels to this.
If VSS is there, VSS is used (just as before). But there is a bit more happening around it than simply placing the VM in a saved state.
However, if VSS is not there (in the VM) then the behavior is slightly different (this is really to support Linux VMs that don't support VSS) - and still achieve a good VM backup.
In another blog post I see it described this way:
Online backup for Linux VMs – even though there’s no VSS support in Linux, the Microsoft guys have managed to find a way to create consistent backups of running Linux VMs, by doing what’s essentially called a “filesystem freeze” by briefly stopping
all disk I/O inside the VM until the host creates a VSS snapshot of the VM on the host (thus getting a file-consistent backup with zero downtime) – once the snapshot is done, disk I/O is resumed and then the actual file copy process starts
Flemming shows the process here:
http://flemmingriis.com/changes-in-hyper-v-backup-in-2012-r2/
If you are calling VSS to perform a backup - nothing has changed. The only thing that has changed is the 'how it happens' , not the 'what you get' and 'how you call it'
This way if you call VSS to perform a backup - you get a good one, no matter the OS in the VM, nor its support for VSS.
Brian Ehlert
http://ITProctology.blogspot.com
Learn. Apply. Repeat.
Disclaimer: Attempting change is of your own free will.

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