Linux LVM Management

Lab Setup:
----------
Application => systemtools => Vritual Machine Manager

[root@localhost ~]# fdisk -l

[root@localhost ~]# fdisk /dev/vda 

Command (m for help): n

Select (default e): e
Selected partition 4
First sector (12314624-16777215, default 12314624): {Press Enter}
Using default value 12314624
Last sector, +sectors or +size{K,M,G} (12314624-16777215, default 16777215): {Press Enter}
Using default value 16777215
Partition 4 of type Extended
Command (m for help): p

Command (m for help): n
First sector (902815744-976771071, default 902815744):  [press Enter]
Last ... +size{K,M,G} (902815744-976771071, default 976771071): +250M
Command (m for help): p
Command (m for help): t
Command (m for help): Enter your patition no
Command (m for help): l
Command (m for help): 8e
Command (m for help): p
Command (m for help): w

Note: Do 2 more parttion for LVM

[root@localhost ~]# lsblk

[root@localhost ~]# partprobe /dev/vda

Physical Volume Create:
-----------------------
[root@localhost ~]# pvcreate /dev/vda5
[root@localhost ~]# pvcreate /dev/vda6
[root@localhost ~]# pvcreate /dev/vda7

[root@localhost ~]# pvdisplay

Group Volume Create:
-----------------------
[root@localhost ~]# vgcreate vg1 /dev/vda5 /dev/vda6 /dev/vda7
[root@localhost ~]# vgdisplay

Note for Exam: vgcreate –s 32M vg1 /dev/vda5 /dev/vda6 /dev/vda7

(note: Defautl PE Size 4MiB)

[root@localhost ~]# vgremove vg1

[root@localhost ~]# vgcreate –s 32M vg1 /dev/vda5 /dev/vda6 /dev/vda7
[root@localhost ~]# vgdisplay

Logical Volume Create:
----------------------
[root@localhost ~]# lvcreate -n lv1 -L 400M vg1
[root@localhost ~]# vgdisplay

[root@localhost ~]# lvdisplay

PE Size: 32 MB

[root@localhost ~]# lvcreate -n lv2 -l 5 vg1

[root@localhost ~]# lvdisplay

[root@localhost ~]# lvscan

[root@localhost ~]# mkfs.xfs /dev/vg1/lv1
[root@localhost ~]# mkdir /data1
[root@localhost ~]# mount /dev/vg1/lv1 /data1
[root@localhost ~]# df -HT
[root@localhost ~]#

[root@localhost ~]# mkfs.ext4 /dev/vg1/lv2
[root@localhost ~]# mkdir /data2
[root@localhost ~]# mount /dev/vg1/lv2 /data2
[root@localhost ~]# df -HT
[root@localhost ~]#

Parmanent Mount:
----------------
[root@localhost ~]# vim /etc/fstab
/dev/vg1/lv1    /data1    xfs    defaults  0 0
/dev/vg1/lv2    /data2    ext4    defaults  0 0

[root@localhost ~]# mount -a
[root@localhost ~]# mount

VG Extended:
------------
=> fdisk /dev/vda   (300 MB)
=> partprobe /dev/vda

[root@localhost ~]# pvcreate /dev/vda8

=> vgextend

[root@localhost ~]# vgextend vg1 /dev/vda8  
[root@localhost ~]# vgdisplay

=> lvextend (xfs file system)

[root@localhost ~]# lvextend -L +100M /dev/vg1/lv1
[root@localhost ~]# df -HT | grep data
[root@localhost ~]# lvscan
[root@localhost ~]# xfs_growfs /data1
[root@localhost ~]# df -HT | grep data

=> lvextend (ext4 file system)

[root@localhost ~]# lvextend -l +3 /dev/vg1/lv2
[root@localhost ~]# df -HT | grep data2
[root@localhost ~]# lvscan
[root@localhost ~]# resize2fs /dev/vg1/lv2
[root@localhost ~]# df -HT | grep data

Lv remove:
----------
[root@localhost ~]# vim /etc/fstab           ;remove fstab entery
[root@localhost ~]# umount /data1
[root@localhost ~]# umount /data2
[root@localhost ~]# lvremove /dev/vg1/lv1
[root@localhost ~]# lvremove /dev/vg1/lv2

VG Remove:
----------
[root@localhost ~]# vgremove vg1

PV Remove:
----------
[root@localhost ~]# pvremove /dev/vda5          
[root@localhost ~]# pvremove /dev/vda6          
[root@localhost ~]# pvremove /dev/vda7         
[root@localhost ~]# pvremove /dev/vda8          

[root@localhost ~]# fdisk /dev/vda
Command (m for help): d
Partition number (1-8, default 8): 4
Command (m for help): w

[root@localhost ~]# partprobe /dev/vda
[root@localhost ~]# fdisk -l
 /dev/vda1
 /dev/vda2
 /dev/vda3

[root@localhost ~]# reboot

================ Done =================