Changing/Adding LUKS keyfile for cache drives?

Based on my reading, I see that I can add new keyfiles to my encrypted array drives with a command such as:

cryptsetup luksAddKey /dev/md1 --key-file /root/keyfile

Where md1 = disk1 and md2 = disk2 etc.. However I cannot seem to figure out what the naming convention is for cache drives.  Can someone fill me in?

Thank you.

EDIT: I think I found it in the Disk Log information.  Appears to be /dev/sdd1 in my case.  Leaving here in case this helps others.

Edited January 18, 20197 yr by Mike Howles