Though I've run across this very useful command before, it has not stuck in my memory. So I put it here hoping that the act of doing so will burn it into my memory, and if not, this may serve as a reminder in the future...

lsblk --fs

It gives a succinct breakdown of the block devices (eg. storage devices) known to the system and how they are being used (RAID membership, LVM membership, UUID, label, filesystem type, mount point).