If nothing else, the RAID BIOS setup might give you the serial number. The RAID monitoring software that should be available (probably Intel's Matrix RAID drivers) should also be able to provide serial numbers and also tell you I think whether the drive is functioning normally. It's likely the SMART status that is bad.)
If even that doesn't work, unplug one and see if you get the error.
Also I don't know if perhaps Dell has different specifications, but most mainboards are labelled with SATA1 to SATA4, they don't start with 0, but the BIOS probably does start at 0. So "drive channel 1" possibly indicates the second ATA channel.
Very confusing. Despite SATA only being one drive per channel, they are laid out in groups of two in many BIOSes. So you get SATA 0 primary and SATA 0 secondary channel, and SATA 1 primary and secondary. This is because each controller in the chipset is for 2 channels.
In any case, I believe that this is probably indicating that the drive on SATA2 port is the one that's bad. The primary controller is for SATA1 and SATA2, which correspond to channels 0 and 1 on the primary controller. SATA3 and SATA4 would be channels 0 and 1 on a secondary controller.