ML 350 G5: server does not switch off but reboots after "shutdown -hf now"

Hi,

we have a HP ProLiant ML 350 G5 running SLES 11 SP2. If i shutdown the server using "shutdown -hf now" on the console, the server shutdown itself, but immediately starts again and does not switch off. This behaviour is problematic because we shutdown the server with PowerChute Network Shutdown by APC when power is off. But when it reboots instead of shutdown, it is running when the UPS switchs of itself after several minutes, and the server fall down, maybe leaving a corrupte filesystem or database. This is what i try to avoid. SLES 11 SP2 is running the most recent kernel from SuSE, and the server has the newest firmware (D21, 05/02/2011). Also setting BIOS to default does not help.

Thanks for any help.

Bernd