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Hyper-V Replication (Disk write speed Problem)

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Hello, I work in a small software publishing business and I undertake to deploy our solutions in virtual servers. 

For this first time I deployed two Hyper-V in workgroup with a single VM (virtual machine ), the replication happens perfectly. 

My problem: 
-the disk writing rate on the Hyper-V is about 900 MB / s 
-the disk writing rate in the VM before enabling replication is about 800 MB / s 
-the writing rate in the VM disk after enabling replication down to about 250 MB / s 

I tried using a VM of in 1st and in 2nd generation, I observed the same differences ... 

But the disk read speed that is about 1300 MB / s in the Hyper-V, remains substantially correct in the VM ( than 1100 Mb / s in all cases). 

The problem is the disk write speed that drops drastically down in the VM after that the réplication is enabled and the initial transfer completed.

Does anyone have an idea of the cause of this huge drop down?

Best regards

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