Reiserfsck...when?

  Hi gang,

  On my openSUSE partition, it somehow or other will do a reiserfsck(?) when I 
reboot from a power outage - automatically. It also does *something* that I set 
the time to have it do it at 0330 in the morning so it doesn't suddenly start 
while I'm doing something important (it takes it about 5 minutes more or less to 
do whatever 'it' is and keeps the hdd thrashing like mad until it's done).

  On my Slackware partition, will this same thing happen if my system goes down 
from a power outage and reboot?

  Is the 'thing' that is doing whatever at 0330 in the morning an 'updatedb'? If 
it is, is this a thing meant only for rpm based distro's or should I do this 
once in a while on my Slackware too?