Hello Camron, we're running the following FSC Primergy Servers on CentOS 4: - a Primergy RX200 - a Primergy Econel200 for the RX200: the Adaptec HostRAID simply doesn't work. It seems to be more or less Software-RAID, so we use Linux' Software RAID for the Econel200: as there's only an onboard FRAID-Controller, we use an additional 3Ware 8006-2 for the drives Both machines work without any real issues so far. The RX200 was installed just after CentOS 4 RC1 was released, the Econel200 was installed january 2006. Regards, Andreas Rogge