create custom sized Iscsi volumes

[bdorring]

Hi. Is it possible to create custom sized iscsi partitions, possible through SSH?
The only size you can create using the web page gui is 1%, 2% etc.
I would like to create 5 Iscsi partitions, each to host a virtual guest. Some of them I would like larger than others and others much smaller than the 1%.

Any assistance would be appreciated (I understand this will probably be unsupported by thecus).