root@debian8:~# mkfs.ext4 /dev/vg00/ext4fs
mke2fs 1.42.12 (29-Aug-2014)
Creating filesystem with 15728640 4k blocks and 3932160 inodes
Filesystem UUID: 09d02731-7001-46ff-b048-531c155b26c3
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
	4096000, 7962624, 11239424

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done