looking for some detailed information on windows 2012R2 "replica" feature
we use hyper- cluster at primary site and would like to use this for DR
only issue I see is that using the broker services which is require in clusters, all the VM's need to go to the same volume at the DR site
(this is configured in the broker)

doesn't seem like a good idea to have all your VM,s at DR site utilize the same volume, we usualy split these into multiple or one per servers
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Ganesh Kumar ASr Infrastructure SpecialistCommented:
This is the best practice about Hyper-V Replica which has replication engine has a module called Change Tracking that captures every writes within the virtual hard drive file of all running virtual machine and creates a log file. The replication happens in the Virtual Hard Disk (VHD) level, making it even easier and allowing any virtual machine to be replicated. The replication using these logs occurs periodically and asynchronously through a HTTP or HTTPS connection. Windows Server 2012 R2 also brought the option to change the replication frequency, which was 15 minutes previously, but now allows you to select between 30 seconds, 5 minutes and 15 minutes. All the data that must be replicated to the Replica Server uses the Network Module, which optimizes the workload to work in slow network connections like WANs. Basically you will need two physical servers running Hyper-V and a network connection between then. That’s all. It doesn’t need any third party hardware or software .

Here is an article best describes about step by step Hyper-V replica :

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