I found out awhile ago that eMMC storage is a different thing entirely when it comes to health monitoring. This is especially true when you’re booting from it like on the Dell Wyse 3040s of which I have several in my homelab. The goal is to get some status information on the eMMC storage health, but the usual SMART utilities don’t work on eMMC.
root@pve1:~# smartctl -H /dev/mmcblk0 -d auto
smartctl 7.3 2022-02-28 r5338 [x86_64-linux-6.8.12-1-pve] (local build)
Copyright (C) 2002-22, Bruce Allen, Christian Franke, www.smartmontools.org
/dev/mmcblk0: Unable to detect device type
Please specify device type with the -d option.
Turns out eMMC has its own health monitoring system that’s actually pretty useful once you know how to access it. I figured I would share my experience since it took some time to figure out. Maybe this will help someone else.