To be honoust, that was the only thing it still was doing, see here

But, as I hate AIX, and have no tuits or intention to fix any failure that would come out of its smoke results, and noone else still (on p5p) running this archaic OS, I saw no good reason to leave this machine consuming power just to smoke blead.

I still smoke HP-UX 10.20, only powered it down for my holiday, because we need the phisical space for some infrastructural reorganizations, but other than for that AIX box, I still do something useful with this box