If you installed 80GB or 500GB drives for your Apple Xserve or Xserve RAID (part number M9449G/A for the 80 GB Seagate Tonka drive and MA207G/A for the 500 GB Seagate Tonka drive), you'll need to apply the Mac OS X Server 10.4.7 Server Software Update to enable SMART support for these drives.
The 10.4.7 Server update can be found at http://www.apple.com/support/downloads/.
Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.