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Cluster Hyper-V VMs slow

Hi,

 

I have a Hyper-V cluster with a CSV connected in ISCSI. Some of my VMs are very slow.

 

For example, I have some VMs (2008R2/2012R2) :  I/O -> 90Mb/s. Everything is Ok.

 

I have other Vms (2008R2/2012R2) : I/O -> 15Mb/s. Not ok.

 

The deduplication is activated everydays à 24AM.

 

Regards.