NetRAID-4M clustering under linux

[koalaz]

I have 2 LH6000 server with a NetRAID-4M card each, and sharing a RS/12 array, to form a cluster.
If use Windows 2000 Advanced Server, it works fine, but I can't use it under RedHat Linux EL3.
I've tried disable the clustering option in BIOS, linux can find that array with one server up, and another power off, when both server power up, the server boots more later can find that array, and the earlier one fails with I/O error. If i enable that clustering option in BIOS, no server can find that array.
I've download HP's FAST utility, and when I try to open the controller, it says these:
FASTCMD> open hpn0
Executing: open "hpn0"
Command Error:
Is this card not supported clustering under linux or this version of utility does not support clustering?
I've updated the card driver to aacraid-1.1.4.2302.1, and it cannot work too.
Can anyone give me some advise?
Thanks alot.