dmesg (nothing since the ext4 expansion was done) or syslog, iotop reports only known processes that are using the disk and it was doing the same thing before those were runningpvcreate /dev/sda (the new disk) to create a physical volume, vgextend storage /dev/sda to add the new disk to the existing VG, then lvresize -l +100%free /dev/storage/storagelv to extend the LV. resize2fs /dev/mapper/storage-storagelv extended the ext4 filesystem, which took maybe 15 minutes and reported done.jbd2/dm-0-8 pop up (as well as jbd2/mmcblk0p2-, which is the sd-card iirc) occasionally, maybe once every 10 seconds, but the drive activity light is blinking on and off maybe 4x a second, and the drive is making noise in time with the lightiotop?