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Logical volume management (LVM) |
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fdisk -l ( To list partition)
create two Parition in unallocated space (sda5&sda6)
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fdisk /dev/sda
n – to create partition
t – partion type (8e for lvm)
w – save
partprobe ( to update to kernel)
To create physical Volume
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pvcreate /dev/sda5 /dev/sda6
pvdisplay ( to check status of physical volume)
To create volume group
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vgcreate /dev/vg0 /dev/sda5 /dev/sda6 ( vg0 – device name for volume group)
vgdisplay ( to check status of volume group)
To create logical volume
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lvcreate -L + 200M -n lvm /dev/vg0 (L for size of lvm and n for logical volume label and lvm is name for logical volume)
lvdisplay (status of lvm)
vgdisplay ( status of volume group)
mkfs.ext3 /dev/vg0/lvm (format logical volume created under /dev/vg0)
mkdir /logical (creating to mount lvm partition under /logical folder)
mount /dev/vg0/lvm /logical
vi /etc/fstab
/dev/vg0/lvm /logical ext3 defaults 0 0
save fstab
mount -a ( update all mounted partition to kernel )
or
mount -o remount /logical ( update mounted logical partition only to kernel)
df -lh ( check mounted status)
or
mount ( check mounted status)
To extend lvm
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lvextend -L +200M /dev/vg0/lvm ( increase lvm size)
lvdisplay
resize2fs /dev/vg0/lvm (to resize the old lvm size to new extended size)
lvdisplay
vgdisplay
To reduce lvm
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umount /logical
resize2fs /dev/vg0/lvm 200M ( to compress the lvm partition data to 200Mb size)
e2fsck -f /dev/vg0/lvm ( to run chkdisk)
resize2fs /dev/vg0/lvm 200M ( to compress the lvm partition data to 200Mb size)
lvreduce -L 200M /dev/vg0/lvm ( to reduce the lvm partition size)
mount /dev/vg0/lvm /logical
or
mount /logical
lvdisplay
vgdisplay
df -h
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