I have a Lenovo TD200, purchased in around 2009, running RAID 10 with 4 hard drives and Fedora 21. I replaced the backplane alas keep getting the "PD Missing" and "Failed to start operation on drive" messages in the MegaRAID preboot. I tried to force the drive off line per this tutorial packetmischief.ca/2011/03/31/monitoring-direct-attached-storage-under-esxi but it still fails. Some screen shots show the messages including PD Missing.