Make one step forward after rediscovering newly added hard disk, simply how to resize it. In virtual world simply put the new disk size, but how to reflect this change in guest operating system:
echo 1 > /sys/block/<devname>/device/rescan partprobe
Continuing how to make them unavailable first to guest operating system in LVM style:
lvchange -an <lv_name> vgexport <vg_name> echo 1 > /sys/block/<devname>/device/delete
In virtual world just remove selected hard disk.