One is what the iSeries team refers to as direct and it is like pSeries Linux I/O. The I/O device is assigned specifically to the Linux partition and is fully managed by the Linux OS. The lists of devices are linked from the Linux on iSeries web pages at http://www.ibm.com/servers/eserver/iseries/linux/support.html.
The gulag system according to Russian statistics caused 1,053,829 deaths [1] or maybe 1.6 million. The Nazi death camps alone killed 3.2 million people[2] (in a period of 4-5 years 1941-1945), not to mention the endless number of labour and POW camps where millions perished as well.
He had several million executed or worked to death in Russia as well. Some estimates will reach over 60 million, but Stalin is actually only a direct cause of 15-20 million deaths. The 5 million difference is from varying estimates due to how many people there were and the secrecy of the USSR.