lspci says it’s an “Dell CERC SATA RAID 2 PCI SATA 6ch (DellCorsair)”, under “Adaptec AAC-RAID (rev 01)”. Dell OMSA 6.5.x installs perfectly and after reboot detects everything but the CERC controller; so add the repository as per the instructions at http://hwraid.le-vert.net/wiki/DebianPackages and then “apt-get install aacraid-status”. Then run “aacraid-status”. It should output something like

# aacraid-status
-- Controller informations --
-- ID | Model | Status
c0 | CERC SATA1.5/6ch | Optimal

-- Arrays informations --
-- ID | Type | Size | Status | Task | Progress
c0u0 | RAID1 | 76G | Optimal

-- Disks informations
-- ID | Model | Status
c0u0d0 | SAMSUNG HD080HJ/P | Online
c0u0d1 | WDC WD800JD-75MSA3 | Online