Using lvcreate to Create Logical Volume via Command Line

As the other article shows how to view existing Logical Volume in a host, workstation or server which has an LVM (Logical Volume Management) installed, titled ‘Using lvs Command to Display Logical Volume Information‘, this article focus on showing how to create the Logical Volume and it is performed in a bash prompt which is the command line interface to type the command for creating logical volume.

But first of all, to be able to create a logical volume, there is a need of an existing volume group.

Below is the command used to create logical volume :

lvcreate -L xx[B,S,K,M,G,T,P,E] -n logical_volume_name volume_group_name
Description : 
lvcreate : It is the command used to create logical volume. 
-L : It is an additional parameter used to specify the size of the newly created logical volume.
xx[B,S,K,M,G,T,P,E] : The xx represent number of the size which is allocated to create the new logical volume. B for Bytes, S for Sector, K for Kilobytes, M for Megabytes, G for Gigabytes, T for Terabytes, P for Petabytes and the last E for Exabytes. Those are the measurement character used to define the size of the new logical volume.  
-n : It is an additional parameter used to specify the name of the newly created logical volume.
logical_volume_name : The name of the newly created logical volume. 
volume_group_name : The name of the volume group used to store the newly created logical volume.

Below is the execution of the command in real situation for an example :

[root@hostname ~]# lvcreate -L 100G -n mylogical-volume-dbdev fc_vms
WARNING: dos signature detected on /dev/fc_vms/mylogical-volume-dbdev at offset 510. Wipe it? [y/n]: y
Wiping dos signature on /dev/fc_vms/mylogical-volume-dbdev.
Logical volume "mylogical-volume-dbdev" created.
[root@hostname ~]#

After successfully create the logical volume, below is the command which can be used to view the newly created logical volume :

[root@hostname ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos_noc01 -wi-ao---- 50.00g
swap centos_noc01 -wi-ao---- 64.00g
tmp centos_noc01 -wi-ao---- 2.00g
var centos_noc01 -wi-ao---- 50.00g
var_log centos_noc01 -wi-ao---- 5.00g
var_log_audit centos_noc01 -wi-ao---- 5.00g
mylogical-volume-centos7 fc_vms -wi-a----- 20.00g
mylogical-volume-dbdev fc_vms -wi-ao---- 100.00g
mylogical-volume-tester fc_vms -wi-a----- 800.00g
mylogical-volume-appdev fc_vms -wi-ao---- 20.00g
mylogical-volume-db fc_vms -wi-ao---- 120.00g
mylogical-volume-linux-repo fc_vms -wi-ao---- 200.00g
mylogical-volume-app fc_vms -wi-ao---- 120.00g
mylogical-volume-win2008r2local_vms -wi-ao---- 40.00g

As shown above, it can be seen that there is a newly created logical volume with the name of mylogical-volume-dbdev with the size of 100G as defined and executed with the previous ‘lvcreate’ command.