On Sun, 14 Nov 2021 02:29:24 +0000 David T-G <davidtg+robot@xxxxxxxxxxxxxxx> wrote: > diskfarm:/mnt/10Traid50md/tmp # ls -goh overlay-sd* > -rw-r--r-- 1 4.0T Nov 12 02:05 overlay-sda1 > -rw-r--r-- 1 4.0T Nov 12 02:05 overlay-sdb1 > -rw-r--r-- 1 4.0T Nov 12 02:05 overlay-sdc1 > diskfarm:/mnt/10Traid50md/tmp # losetup -a > /dev/loop1: [66326]:1059 (/mnt/10Traid50md/tmp/overlay-sdb1) > /dev/loop2: [66326]:1060 (/mnt/10Traid50md/tmp/overlay-sdc1) > /dev/loop0: [66326]:1058 (/mnt/10Traid50md/tmp/overlay-sda1) > > my overlay files and loopback devices. But ... > > It seems that blockdev does not like > > diskfarm:/mnt/10Traid50md/tmp # blockdev --getsize ./overlay-sda1 > blockdev: ioctl error on BLKGETSIZE: Inappropriate ioctl for device > > my files It must be run on block devices, not files, so try: blockdev --getsize /dev/loop0 -- With respect, Roman
