linux + tool that can identify RAID configuration

I am searching for a long time tool that can runs as CLI on linux machine and identify which RAID configuration is defined on the disk or disks ( according to the list from lsblk ) the reason for that we cant showdown ( Production machines ) the linux machine and look on the RAID controler when OS id down I am just cant understand why it is so difficult to capture the RAID conf when OS is up , must be somewhere tool that identify the RAID configuration