We currently have 2 Hyper-V host (Windows Server 2016).
One of them contains all of the running machines, while the other contains the same machines, but as powered off replicas.
To keep them in sync, we are using a replication job in VEEAM Backup & Replication, but the problem we are currently experiencing is that the virtual machines can't access their hard drive for about 5 seconds every time VEEAM runs the replication job.
After some investigation, we discovered that it probably isn't VEEAM that causes the issues, but Hyper-V.
We determined this by manually creating and merging a checkpoint (just like VEEAM does every time it replicates) when VEEAM was turned off.
Is this normal behaviour, or can it be fixed?