Infrastructure

Since the prevailing system was configured with RAID 10, so it is necessary to Add new Hard Drives as Even i.e. you have to add hard drives (Physical) in even numbers means you have to add either 2 or 4 or 6 or 8 or 10 so on.  Once added, you have to reconfigure RAID by adding these hard drive , note if you does not select hard drive in even number, then it will not proceed.

 While Adding New Harddrive (Figure 2) to Dell PowerEdge R720, Already having two hard drives(Figure 1) of 1.2 TB and 10K RPM  Figure 1 Figure 2 But, Operating System was not picking it up, not even in unallocated or not initialized. the reason was that, this harddrive was configured as RAID in the bios, while system was configured as NON RAID. So in order to make it working, we have to configured it as NON RAID through BIOS