I've resovled this issue by change to use basic disk in iSCSI target side. [i'm using ms intialitor]
either attach a basic physic disk on iSCSI target side or convert it to basic.
see here: http://technet.microsoft.com/en-us/libr ... 71404.aspx, we need to use "BASIC disk"
The Latest Gartner® Magic Quadrant™Hyperconverged Infrastructure Software