Green/amber means the drive has not yet failed, but needs to be replaced.  You need to force the drive offline before you replace it.  This can be done in the OpenManage software.  When you replace the drive, it must be replaced (old one removed, new one inserted) "hot" (never power down to replace a hot-swappable drive).  Just pull the offline drive, wait at least 30 seconds, insert replacement.  If the rebuild doesn't happen automatically, you will need to assign the disk as a hot-spare.
Hi, I Have Poweredge R710 server with 8 HDD configured with RAID 10. One HDD #4. shows amber light blinking and green light. that means HDD is faulty now. Please help me whih the precedure, how to replace this faulty HDD with new HDD.  
Procedure to replace faulty HDD with New HDD in poweredge R710 conf. with RAID 
10.