[CentOS] SiL311x SataRaid (sata_sil)

Hi,

On my x86_64 system I have a SiL311x controller that can do RAID. If I 
configure my 2 identical disks in a RAID1 setup, I would expect to see 
only 1 block device on Linux. Still I see 2 block devices.

Is this intentional, and if so, isn't that dangerous ? (i.e. writing to 
both disks at the same time)

Anyone with an insight, please explain :)

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[all I want is a warm bed and a kind word and unlimited power]