ok Lukáš I think I found where the problem is. I just realized that I created that filesystem without journaling (in order to increase perform for the VM disks). I created it with: mkfs.ext4 -O ^has_journal /dev/vgthin1/lvol2 I went back and created the filesystem again (on a thin lvol) with default options and indeed fstrim works as expected. I created ANOTHER thinvol (without journaling) and fstrim doesn't work. Is this a bug or does fstrim requires ext4 with journal by design? My apologies for not stating this since the beginning! -- Jorge _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
