It may be possible, but probably neither easy nor supported.
The 3 distros IBM supports on the pSeries are SuSE Enterprise Server 8, RH Enterprise Server 3 and Turbolinux. Bear in mind that the pSeries use RISC Power chips which are similar to MAC PowerPC but not quite the same.
I can't find any indication from Mandrake that they might support this chipset.
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