Centos 7 new logical volume

[root@centos7 ~]# uname -a
Linux centos7.example.com 3.10.0-327.el7.i686 #

[root@centos7 ~]# vgs
  VG         #PV #LV #SN Attr   VSize  VFree
  cl_centos7   1   2   0 wz--n- 19.51g 40.00m

[root@centos7 ~]# lvcreate  -L 10M -n vol01 cl_centos7
  Rounding up size to full physical extent 12.00 MiB
  Logical volume "vol01" created.

[root@centos7 ~]# lvs
  LV    VG         Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root  cl_centos7 -wi-ao---- 17.47g
  swap  cl_centos7 -wi-ao----  2.00g
  vol01 cl_centos7 -wi-a----- 12.00m

[root@centos7 ~]# mkdir /devops01

[root@centos7 ~]# mkfs.ext4 /dev/cl_centos7/vol01
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
3072 inodes, 12288 blocks
614 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=12582912
2 block groups
8192 blocks per group, 8192 fragments per group
1536 inodes per group
Superblock backups stored on blocks:
        8193
Allocating group tables: done
Writing inode tables: done
Creating journal (1024 blocks): done
Writing superblocks and filesystem accounting information: done

[root@centos7 ~]# mount /dev/cl_centos7/vol01 /devops01/

[root@centos7 ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/cl_centos7-root    18G  4.7G   13G  27% /
/dev/mapper/cl_centos7-vol01   11M  204K  9.6M   3% /devops01