download storcli: https://downloadcenter.intel.com/download/25499/StorCLI-Phase-2-0

once unpacked and installed:

cd /opt/MegaRAID/storcli64 

commands:

./storcli64 /c0 show

./storcli64 /c0 /eall /sall show all

./storcli64 /c0 /eall /sall show rebuild

ref: https://support.nine.ch/articles/raid-configuration-using-storcli