Promox ve 2.3 installation on sd card questions

Hi,


I'm trying to install promox ve on my dell servers


Configuration:
-2 Dell PowerEdge R620
-Bi xeon
-256go RAM
-2 SD card 2go (miroring)
-No hard disk
-Storage dell MD3200 sas attachement


I have some questions:
Is there someone who already installed promox ve on SD card?
On promox ve installation wizard , i see only 1go disk space, not 2go. May be a driver problem?
And 1go disk space seems not sufficient, what is the minimum disk size for the installation?


Thanks in advance for your help.