LVM is a method of allocating harddrive space into logical volumes that can be easily resized instead of partitions.
With LVM the harddrive (or) set of harddrives are allocated to one or more physical volumes.
The physical volumes are combined into volume groups
Each volume group is divided into logical volumes which are assigned mountpoints such as /home and filesystem types such as ext3.
To configure LVM
1)Create three LVM partitions
2)Convert them as physical volumes
3)Create volume groups from physical volumes
4)Create logical volumes from volume groups and assign mountpoints
IMPLEMENTATION:
# fdisk /dev/sda
n
+500M
t
<partition number>
8e
w
partprobe
To convert LVM partitions as physical volumes
# pvcreate /dev/sda<partition numbers>
ex: pvcreate /dev/sda{9,10,11}
To view physical volumes
# pvdisplay
To create volume group
# vgcreate <vg name> <partitions>
ex: vgcreate maaza /dev/sda{9,10,11}
To view volume groups
# vgdisplay
To create a logical volume
# lvcreate -L <+size> <vg name> -n <LV name>
ex: lvcreate -L +500M /dev/maaza -n fanta
To view logical volumes
# lvdisplay
To format logical volumes
# mke2fs -j /dev/maaza/fanta
Create a mountpoint and mount logical volume on it
# mkdir /cyber
# mount /dev/maaza/fanta /cyber
# cd /cyber
To extend size of logical volume
# umount <mountpoint>
# lvcreate -L <size> <lv name>
ex:lvcreate -L +500M /dev/maaza/fanta
To make filesystem for extended size
# resize2fs <logical volume>
ex: resize2fs /dev/maaza/fanta
# mount /dev/maaza/fanta /cyber
To resize a logical volume
note:whenever we are reducing an LVM we have to take backup
# mkdir /a
# cp -rf /cyber/* /a
# lvreduce -L <-size> <LVM>
ex: lvreduce -L -100M /dev/maaza/fanta
To format LVM
# mkfs.ext3 <logical volume>
ex:mkfs.ext3 /dev/maaza/fanta
# mount /dev/maaza/fanta /cyber
# cp -rf /a/* /cyber
To remove an LVM
# umount <mountpoint>
# lvremove <logical volume>
ex:lvremove /dev/maaza/fanta
To extend volume group
1)create another LVM partition
2)convert into physical volume
# vgextend <vg name> <partition name>
ex:vgextend /dev/maaza /dev/sda12
To reduce volume group
# vgreduce <vgname> <partition name>
ex:vgreduce /dev/maaza /dev/sda12
To remove volume group
# vgremove <vg name>
ex:vgremove /dev/maaza
To delete physical volumes
# pvremove <partitions>
ex:pvremove /dev/sda{9,10,11,12}
With LVM the harddrive (or) set of harddrives are allocated to one or more physical volumes.
The physical volumes are combined into volume groups
Each volume group is divided into logical volumes which are assigned mountpoints such as /home and filesystem types such as ext3.
To configure LVM
1)Create three LVM partitions
2)Convert them as physical volumes
3)Create volume groups from physical volumes
4)Create logical volumes from volume groups and assign mountpoints
IMPLEMENTATION:
# fdisk /dev/sda
n
+500M
t
<partition number>
8e
w
partprobe
To convert LVM partitions as physical volumes
# pvcreate /dev/sda<partition numbers>
ex: pvcreate /dev/sda{9,10,11}
To view physical volumes
# pvdisplay
To create volume group
# vgcreate <vg name> <partitions>
ex: vgcreate maaza /dev/sda{9,10,11}
To view volume groups
# vgdisplay
To create a logical volume
# lvcreate -L <+size> <vg name> -n <LV name>
ex: lvcreate -L +500M /dev/maaza -n fanta
To view logical volumes
# lvdisplay
To format logical volumes
# mke2fs -j /dev/maaza/fanta
Create a mountpoint and mount logical volume on it
# mkdir /cyber
# mount /dev/maaza/fanta /cyber
# cd /cyber
To extend size of logical volume
# umount <mountpoint>
# lvcreate -L <size> <lv name>
ex:lvcreate -L +500M /dev/maaza/fanta
To make filesystem for extended size
# resize2fs <logical volume>
ex: resize2fs /dev/maaza/fanta
# mount /dev/maaza/fanta /cyber
To resize a logical volume
note:whenever we are reducing an LVM we have to take backup
# mkdir /a
# cp -rf /cyber/* /a
# lvreduce -L <-size> <LVM>
ex: lvreduce -L -100M /dev/maaza/fanta
To format LVM
# mkfs.ext3 <logical volume>
ex:mkfs.ext3 /dev/maaza/fanta
# mount /dev/maaza/fanta /cyber
# cp -rf /a/* /cyber
To remove an LVM
# umount <mountpoint>
# lvremove <logical volume>
ex:lvremove /dev/maaza/fanta
To extend volume group
1)create another LVM partition
2)convert into physical volume
# vgextend <vg name> <partition name>
ex:vgextend /dev/maaza /dev/sda12
To reduce volume group
# vgreduce <vgname> <partition name>
ex:vgreduce /dev/maaza /dev/sda12
To remove volume group
# vgremove <vg name>
ex:vgremove /dev/maaza
To delete physical volumes
# pvremove <partitions>
ex:pvremove /dev/sda{9,10,11,12}
