Hyper-V 2012 R2 CSV Free Space

Hi All

I have two nodes for EQL 6210XS and there are bind a name "EQL Pool". Total capacity almost 36TB.

Now when i create a volume 8TB for the Hyper-v cluster shared volume and create some VM in CSV .All Hyper-V HOST connection to the EQL Volume via ISCSI MPIO.

In the hyper-v failover cluster manager show our CSV have 500GB free space , but the EQL Group Manager show have 5TB free space.

It seems that Hyper-V HOST cann't  correct identification the volume free space after deduplication.

Is there any suggestion to exclude this problem?