There was some strange partition /dev/sda2 of 6.5G size on my HiveOS:
root@rig0:/# cat /proc/partitions
major minor #blocks name
8 0 117219767 sda
8 1 20480 sda1
8 2 7323648 sda2
root@rig0:/# df -h
Filesystem Size Used Avail Use% Mounted on
udev 1.9G 0 1.9G 0% /dev
tmpfs 383M 44M 340M 12% /run
/dev/sda2 6.8G 6.5G 0 100% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
tmpfs 100M 16K 100M 1% /tmp
tmpfs 1.9G 0 1.9G 0% /var/tmp
tmpfs 1.9G 30M 1.9G 2% /var/log
tmpfs 1.9G 0 1.9G 0% /var/log/journal
tmpfs 1.9G 0 1.9G 0% /var/log/apt
/dev/sda1 20M 5.7M 15M 29% /hive-config
