Vmware 6.0 Datastore compressed LUN

Hi. I have a "storage" based on HP G7 + DAS Supermicro. It runs OmniOS + nappit and shares a LUN via FC to VMware.

I got x2 compression ration on this volume.

root@kup-san-02:/root# zfs get compressratio DR_data/volume_0

NAME              PROPERTY       VALUE  SOURCE

DR_data/volume_0  compressratio  2.02x  -

root@kup-san-02:/root# zfs list DR_data/volume_0

NAME               USED  AVAIL  REFER  MOUNTPOINT

DR_data/volume_0  30.1T  20.3T  10.4T  -

So it seems i have 20 TB free on this block device, but vmware can see only uncompressed space, and shows

[root@esx-01b:/vmfs/volumes] df -h

Filesystem   Size   Used Available Use% Mounted on

VMFS-5       3.6T 612.3G      3.0T  16% /vmfs/volumes/01b-local

VMFS-5      30.0T  20.1T      9.9T  67% /vmfs/volumes/DR.PROD01-SAS-Raid-50_SAN_FC

Is there any way how i can use all available space ???