Configure LVM on Centos7
Manage physical Volumes:
This is the basic operation of managing physical Volumes.
Create physical Volume:-
[root@server ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
# specify like follows if you'd like to specify volume size
[root@server ~]# pvcreate --setphysicalvolumesize 40G /dev/sdb1
Physical volume "/dev/sdb1" successfully created
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Display physical Volumes
# To display physical volumes
[root@server ~]# pvdisplay /dev/sdb1
Change size of physical Volume
# change to 40G
[root@server ~]# pvresize --setphysicalvolumesize 40G /dev/sdb1
Physical volume "/dev/sdb1" changed
1 physical volume(s) resized / 0 physical volume(s) not resized
[root@server ~]# pvdisplay /dev/sdb1
Display reports of physical Volumes.
[root@server ~]# pvs /dev/sdb1
To Scan physical Volumes.
[root@server ~]# pvscan
To Delete physical Volume
[root@server ~]# pvremove /dev/sdb1
Labels on physical volume "/dev/sdb1" successfully wiped
[root@server ~]# pvdisplay /dev/sdb1
Failed to find physical volume "/dev/sdb1".
Manage Volumes Grouops:
This is the basic operation of managing physical Volumes.
Create Volume Group from PV /dev/sdb1:-
[root@server ~]# vgcreate vg_svr /dev/sdb1
Display Volumes Groups
[root@server ~]# vgdisplay vg_svr
Change Volume Group's name
[root@server ~]# vgrename vg_srv vg_example
Volume group "vg_srv" successfully renamed to "vg_example" vgdisplay
[root@server ~]# vgdisplay vg_example
Display reports of Volume Groups
[root@server ~]# vgs
To Scan Volume Groups
[root@server ~]# vgscan
To Delete Volume Group
# disable target volume group first and delete it
[root@server ~]# vgchange -a n vg_example
0 logical volume(s) in volume group "vg_example" now active
[root@server ~]# vgremove vg_example
Volume group "vg_example" successfully removed
Manage Logical Volumes:
This is the basic operation of managing Logical Volumes.
Create Logical Volume from VG vg_example:-
[root@server ~]# lvcreate -L 50G -n lv_data vg_srv
Display Logical Volumes.
[root@server ~]# lvdisplay /dev/vg_srv/lv_data
Rename Logical Volume
[root@server ~]# lvrename vg_srv lv_data lv_example
Renamed "lv_data" to "lv_example" in volume group "vg_srv"
[root@server ~]# lvdisplay /dev/vg_srv/lv_example
Display reports of Logical Volumes
[root@server ~]# lvs
To Scan Logical Volumes
[root@server ~]# lvscan
[root@server ~]# lvdisplay
Extend Logical Volume.
[root@server ~]# lvextend -L 60G /dev/vg_srv/lv_example
#for the case of extending ext4 filesystem
[root@server ~]# lvdisplay /dev/vg_srv/lv_example
[root@server ~]# resize2fs
Reduce Logical Volume.
#Unmount target device first.
# for ext4, check it first
[root@server ~]# e2fsck -f /dev/vg_srv/lv_example 20G
[root@server ~]# resize2fs /dev/vg_srv/lv_example 20G
#reduce logical volmue at last
[root@server ~]# lvreduce -L 20G /dev/vg_srv/lv_example
To Delete Logical Volume. first unmount then stop logical volume then delete logical volume