root@server:# uname -a
Linux server 4.4.0-79-generic #100-Ubuntu SMP Wed May 17 19:58:14 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

root@server:# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            490M     0  490M   0% /dev
tmpfs           100M   11M   89M  11% /run
/dev/vda1        30G   18G   12G  60% /
tmpfs           497M     0  497M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           497M     0  497M   0% /sys/fs/cgroup
tmpfs           100M     0  100M   0% /run/user/0

root@server:# lsblk -a
NAME   MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vda    253:0    0  30G  0 disk
└─vda1 253:1    0  30G  0 part /
loop0    7:0    0       0 loop
loop1    7:1    0       0 loop
loop2    7:2    0       0 loop
loop3    7:3    0       0 loop
loop4    7:4    0       0 loop
loop5    7:5    0       0 loop
loop6    7:6    0       0 loop
loop7    7:7    0       0 loop