Linux Centos Disk information on HP DL 160

I have a HP DL 160 and I would like to know all possible information on my physical disks.
I want to know how many physical disks I have.

I want to know if they are in raid 1 or raid 5 etc.
I want to know if I can add disk or I have a disk that I can add to the operating system and use it.
I'm not sure which commands or utilities can show me these info
when I do df -h I get:

df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
898G 4.5G 847G 1% /
/dev/sda1 99M 24M 70M 26% /boot

tmpfs 2.0G 0 2.0G 0% /dev/shm

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