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.
Between the start of the Soviet Union and Stalin's death, it is estimated that this many people were worked to death or simply executed in this system of prison labor camps. This number includes millions who were sent to gulags during WW2 so would overlap with the 20-30 million Soviet citizens who died during WW2.