Install PERCCLI on Debian / Proxmox, and show PERC details.
# Download from the Dell website
wget https://dl.dell.com/FOLDER07815522M/1/PERCCLI_7.1910.00_A12_Linux.tar.gz
# Extract archive
tar -xf PERCCLI_7.1910.00_A12_Linux.tar.gz
# Install .deb package
sudo dpkg -i perccli_007.1910.0000.0000_all.deb
# Browse to directory
cd /opt/MegaRAID/perccli
# Show PERC details
./perccli64 show