Hi All of my computers have a SSD for the root-filesystem. But on none fstrim works. I only get this: $ fstrim -v / fstrim: /: discard operation not supported. How can i debug why fstrim/the kernel thinks discard isn't supported? All my root-filesystems are XFS. kernel differs by computer, currently between 3.15.2 and 3.16.1 (Same self-compiled kernel on all machines) util-linux is version 2.25 (Experimental Package from Debian SID) The mount-output for the root-filesystem of one my compters looks like this: /dev/sda2 on / type xfs (rw,noatime,attr2,inode64,allocsize=64k,noquota) I DO NOT use an initrd/initramfs, so the root-filesystem is still the original mount from the kernel itself (i case that matters) -- Matthias -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html