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Distribution: Ubuntu, RedHat, VMWare, CentOS, Windows, Android, Mac
More simpler, run the below command (as ROOT):
fdisk -l | grep Disk
This will show all the disks as seen by the OS. No packages need to be installed to run fdisk.
To know about the RAID, do you use a hardware RAID contoller i your machine. If yes, during reboot, the raid controller will prompt you a key combination to login to the controller and check the disks and raid setup. If not a hardware controller, then let us know how you created the RAID in the OS.
Guys, he said hardware raid. That means nothing is going to show up in fdisk, etc. The hardware controller isolates the OS from the raw disks.
The only way is through the raid card utilities. Usually there's a boot option to check the config, and usually there's an OS-level program that can check/print/monitor/control things. Without knowing the brand of the card we can't provide any more info though.
I agree with what suicidaleggroll said; this is HW RAID, not SW.
We need to know the HW make of the PC and possibly the controller card (it may be from the same manufacturer).
Normally they provide extra pkgs to monitor from the OS level as well.