JMICRON HW RAID MANAGER SOFTWARE
Although you have the option to configure the device via the rear mode switch RaidSonic offers the JMicron HW RAID Manager on their support page (the IB-RD2121StS is based on a JMicron HW RAID Controller).
Through the JMicron HW RAID Manager you can see the type and capacity of the mounted drives (you need to have the rear switch at one of the 2 RAID modes to do so), check SMART Information for either drive, check logs, create/delete RAID/LARGE configurations, set event notifications, update firmware and set the stand-by timer setting (this feature basically turns all drives to energy-saving mode).
Now for all of you who are into RAID i thought i should point out that although we used two drives totaling to a total of 260GB (real GB) RAID0/1 take into account the smallest one of the two (thus only making available a total of 223GB in RAID0 and 111GB in RAID1) while when using LARGE mode you get all 260GB.