Yes, sorry for having caused this inconvenience I repeat and extend the OP:
1st error: fstrim --verbose --all reports nothing, but should due to --verbose 2nd error: fstrim --verbose / gives a wrong error message "fstrim: /: the discard operation is not supported" This happens on Debian 11.2 Bullseye on an Intel hardware The root file system is a RAID1 software array, but on a second Intel hardware with only one SSD, same Debian version, the behavior of fstrim is the same On a Raspberry Pi with Debian 10 Buster, everything works fine: fstrim --verbose / /: 196.9 MiB (206516224 bytes) trimmed or: fstrim --verbose / /: 0 B (0 bytes) trimmed On both systems, the version of fstrim is the same: fstrim --version fstrim from util-linux 2.36.1 If I use the command from fstrim.service on Debian 11: /sbin/fstrim --listed-in /etc/fstab:/proc/self/mountinfo --verbose --quiet-unsupported I also get no output
