Hi, I remember a few cases after replacing a hard drive sometimes it shows predictive failure if PERC firmware is old. Could you check PERC FW and if possible please do up to date. [URL] But first please clear SEL log on iDRAC [URL] Then perform firmware updates to the Hard Drive, PERC, BIOS and iDRAC to ensure that they are running the latest firmware. But if the hard drive still has a predictive error might need to replace that hard drive. 
We recently had a drive fail in one of our MD1200 enclosures that is connected to a R720 PERC 810 controller.  It was in a predictive fail state so it wasn't completely down.  I replaced it and let the array rebuild.  However the iDRAC still shows the drive in a predictive failure state.  The light is no longer orange on the drive bay, they are all green and the controller reports no SMART errors. Is there a way to reset the iDRAC so that it sees the drive is good now?  The iDRAC is seeing the new drive SN and information, it just it still saying it is still in predictive failure state.
R720 iDrac still shows HDD drive error after replacement