Illegal Operation

When I try to create a directory under /home I am getting "illegal Operation".Other than a possible kernel problem, is there any other cause for this?mkdir /home/test> illegal Operation/home permissions are set to 664I am root
[271 byte] By [jzeits] at [2007-11-25 23:20:24]
# 1
/home, by default is reserved for automounter. You may want to kill autofs. Users are "usually" created in /export/home.
jds2n at 2007-7-5 18:08:20 > top of Java-index,General,Talk to the Sysop...