Hello Friends,
My friend asked me a query regarding the LVM Creation with a new harddisk. So i thought that it might be helpfull to all my friends using LVM on Linux.
To create LVM partition when we have a new hard disk installed on our server/system.
STEP 1. fdisk /dev/hdb // create a partition in second HD
Now show the partition table on your system using p command.
Command (m for help): p // show partition table
OUTPUT
Disk /dev/hdb: ---.- GB, xxxxxxxxxx bytes
xxxx heads, xx sectors/track, xxxxxx cylinders
Units = cylinders of xxxxx * xxx = xxxxxxxx bytes
Device Boot Start End Blocks Id System
// nothing
Create a new partition using n option
Command (m for help): n // create partition
Command action
e extended
p primary partition (1-4)
p // primary
Partition number (1-4): 1 // partition number
First cylinder (x-xxxxx, default 1): // First cylinder
Using default value 1 Last cylinder or +size or +sizeM or +sizeK (x-xxxxx, default xxxxx): // Last cylinder
Using default value xxxxx
After creation of new partition we need to see our partition table.
Command (m for help): p // show partition table
OUTPUT
Disk /dev/hdb: xxx.x GB, xxxxxxxxxxxx bytes
xxx heads, xx sectors/track, xxxxx cylinders
Units = cylinders of xxxxxxx * xxx = xxxxxxx bytes
Device Boot Start End Blocks Id System
/dev/hdb1 x xxxxx xxxxxxxxxx 83 Linux // created
Command (m for help): t // change partition type
Selected partition 1 // number
Hex code (type L to list codes): L // show list of type
Hex code (type L to list codes): 8e // Linux LVM
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): p // show partition table
OUTPUT
Disk /dev/hdb: xxx.x GB, xxxxxxxxxxx bytes
xxx heads, xx sectors/track, xxxxx cylinders
Units = cylinders of xxxxx * xxx = xxxxxxxxx bytes
Device Boot Start End Blocks Id System
/dev/hdb1 x xxxxx xxxxxxxx 8e Linux LVM // changed
Command (m for help): w // save and exit
STEP 2. fdisk -l /dev/hdb // show status
STEP 3. Now we need to create Physical Volume
pvcreate /dev/hdb1 // create Physical Volume
If we need to specify partition size, use command as below
pvcreate --setphysicalvolumesize 100G /dev/hdb1
To display status of Physical volume (Optional)
pvdisplay /dev/hdb1 // display status
STEP 4. We can change the volume size of Physical volume (Optional)
pvresize --setphysicalvolumesize 100G /dev/hdb1
STEP 5. To show the physical volume
pvs /dev/hdb1
STEP 6. To Scan the Physical volume
pvscan /dev/hdb1
Now we can create Logical Volume, using the following steps.
1. lvcreate –L 10G –n lvm1 vg0
2. lvdisplay // to display the logical volumes.
3. lvextend –L 20G /dev/vg0/lvm1
4. resize2fs /dev/vg0/lvm1 //Most important thing to do in last
Note: Here i have used xxx for any number, depands on the size of the harddisk.
