Dalby712,  We will need more information. What is the controller installed? What raid configuration are you working with? What is the error you are seeing? You can remove the failed drive and then wait 20 seconds and then insert the replacement. You will need to do this while the server is powered on. Let me know.
Hello,   I have a fault with this unit and have new one to replace the faulty one there are 2 of them on the server. What is the procedure to change this in regards does the server have to shutdown?   Regards   Robert
Dell 146GB SAS 6Gbps 15k 6 cm (2.5") HD Hot Plug Fully Assembled