If your XSERVE RAID won't respond or a NIC is missing; try this
1.Use RAID Admin to turn off the Xserve RAID.
2.If cache backup batteries are installed, pull them slightly out of the RAID.
3.Disconnect the power cables from both power supplies.
4.After 10 to 20 seconds, reconnect the power cables and start the Xserve RAID.
5.All LEDs on both controllers should turn back on.
6.Reinstall the cache backup batteries.