Update vm-tweaks.sh

- Add common devices to multipath blacklist

BashScripts/vm-tweaks.sh

@@ -6,12 +6,26 @@ if [[ $EUID -ne 0 ]]; then
 fi
 REALUSER=$(logname)
 
+# Add floppy to modprobe blacklist
+# https://askubuntu.com/questions/719058/blk-update-request-i-o-error-dev-fd0-sector-0
 rmmod floppy > /dev/null 2>&1 && (
 	echo "Adding floppy to modprobe blacklist"
 	echo "blacklist floppy" | tee /etc/modprobe.d/blacklist-floppy.conf
 	dpkg-reconfigure initramfs-tools
 )
 
+# Add common devices to multipath blacklist
+# https://askubuntu.com/questions/1242731/ubuntu-20-04-multipath-configuration
+if [[ -f "/etc/multipath.conf" ]] && ! grep -q "blacklist" "/etc/multipath.conf"; then
+        echo Updating /etc/multipath.conf
+        cat <<EOT >> "/etc/multipath.conf"
+blacklist {
+    devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st|sda)[0-9]*"
+}
+EOT
+        /etc/init.d/multipath-tools restart
+fi
+
 # Disable Cloud-init
 if [ ! -f "/etc/cloud/cloud-init.disabled" ]; then
 	echo "Disabling cloud-init"