How to manage LVM in Linux

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How to manage LVM in Linux

Creating Dynamic Disc

We are going to create three discs on a USB drive, each disc will have 512 MB. First, verify if we have connected the USB drive as /dev/sdc/:

# fdisk -l

If we have a USB drive connected as /dev/sdc:

# fdisk /dev/sdc

Command d can remove existing logical volumes on the USB drive.

Enter commands n, p, 1-3, +512M to create 3 logical volumes. For example, we create the first volume /dev/sdc1:

Command (m for help): p
Command (m for help): n
Partition number (1-3): 1
First sector (34-41943006, default 41940992): 34
Last sector, +sectors or +size{K,M,G,T,P}: +512M
Command (m for help): p

Command w saves new partition table and changes can not be undone.

Reload partition table:

# partprobe

Format created discs:

# pvcreate /dev/sdc1
# pvcreate /dev/sdc2
# pvcreate /dev/sdc3

Verify:

# pvdisplay

Create volume group DATA:

# vgcreate DATA /dev/sdc1 /dev/sdc2 /dev/sdc3

To be sure verify group capacity:

# vgdisplay

Create physical volume from 100% of physical volume capacity.

# lvcreate -l +100%FREE -n new_volume DATA

Format the new volume:

# mkfs -t ext3 /dev/DATA/new_volume

Create a directory for mount:

# mkdir /mnt/dynamic

Mount the new volume:

# mount /dev/DATA/new_volume /mnt/dynamic

Mount verification:

# df -hT

Mount verification using a graphical interface:

# system-config-lvm

Dynamic Resize Dynamic Disk

Create primary logical partition /dev/sdc4, that use the rest of the USB drive:

# fdisk /dev/sdc
Command (m for help):n
Command (m for help):4
Command (m for help):p
<enter>
<enter>

Command w saves a new partition table and it can not be undone.

Verify partition table:

# partprobe

Add new disk to physical LVL partition:

# pvcreate /dev/sdc4

Verify:

# pvdisplay

Extend volume group:

# vgextend DATA /dev/sdc4

Verify extended volume group:

# vgdisplay

Extend logical volume with 1 GB:

# lvextend -L+1G /dev/DATA/new_volume

Resize size of disk:

# resize2fs /dev/DATA/new_volume

Remount:

# mount -o remount /dev/DATA/new_volume

Verify:

# df -hT

Removing Dynamic Disc

Unmount logical volume:

# umount /dev/DATA/new_volume

Remove logical volume:

# lvremove /dev/DATA/new_volume

Remove volume group:

# vgremove /dev/DATA

Remove physical volumes:

# pvremove /dev/sdc1
# pvremove /dev/sdc2
# pvremove /dev/sdc3
# pvremove /dev/sdc4

Verification using a graphical interface:

# system-config-lvm

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