Another article relate to Logical Volume Management discuss specifically how to display an information about existing or available logical volume in a server, workstation or a host with a specific command as one way to do it simply. The command itself must be executed in root privilege and it is generally typed in the bash prompt.
The command which should be typed is :
The executed command output can be shown as follows :
[root@hostname ~]# LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root server_noc01 -wi-ao---- 50.00g swap server_noc01 -wi-ao---- 64.00g tmp server_noc01 -wi-ao---- 2.00g var server_noc01 -wi-ao---- 50.00g var_log server_noc01 -wi-ao---- 5.00g var_log_audit server_noc01 -wi-ao---- 5.00g server-apps fc_vms -wi-a----- 20.00g server-dbdev fc_vms -wi-ao---- 800.00g server-gantt fc_vms -wi-ao---- 20.00g server-uat fc_vms -wi-ao---- 120.00g server-sit fc_vms -wi-ao---- 120.00g server-production fc_vms -wi-ao---- 120.00g internal-apps fc_vms -wi-ao---- 1.10t internal-origin fc_vms -wi-a----- 1.00t repo-linux fc_vms -wi-ao---- 200.00g repo-apps fc_vms -wi-ao---- 120.00g db-pooling local_vms -wi-ao---- 40.00g [root@hostname ~]#
The above command used to display all logical volume created or available in host, workstation or server. As we can see, there are three volume groups available which contains many logical volumes for each of the volume groups.
The logical volume exist when the volume group has already been created. And the command of ‘lvs’ along with the other command related with Logical Volume Management can only be executed only if LVM or Logical Volume Management has already been installed in the Linux operating system which is operated.
To be able to check whether it has already installed or not in Redhat, Fedora and CentOS or in other distribution which has any similar variant or flavor, yum can be used as one of package management tool exist to check whether it has already installed or not by typing the following command :
yum list installed | grep lvm
When the article is created, LVM is in LVM 2.0 and that is the one currently used for the purpose of managing Logical Volume.
This is sample of the output from the above command’s execution :
[root@hostname ]# yum list installed | grep lvm lvm2.x86_64 7:2.02.130-5.el7_2.5 @updates lvm2-libs.x86_64 7:2.02.130-5.el7_2.5 @updates [root@hostname]#
The above output command display the installed package of LVM in operating system. It is LVM2.0 and with this package installed root, super admin or wheel group admin can execute ‘lvs’ command for retrieving information about logical volume created.