AWS nitro instances use block device names like /dev/nvme2n1 but the AWS console still shows them as /dev/sdb etc, so it can be difficult to work out which disk in the console maps to the mounted device when looking at df -h.

Use this to get the console mapping:

$ sudo nvme id-ctrl -v /dev/nvme2n1 2>&1 | grep "0000:"

0000: 73 64 69 20 20 20 20 20 20 20 20 20 20 20 20 20 "sdi............."

So in the above example, block device /dev/nvme2n1 will be shown as /dev/sdi in the AWS console.

The nvme command is from the nvme-cli project.