I have a 1TB hard disk. The 400GB of the hard disk(/dev/cciss/c0d0p2) is configured as LVM, with the remaining 600GB left unutilized. Now I want to extend the logical volume(LVM) by 600GB by utilizing the unused 600GB.
The LV name is /dev/rootvg/scribe
Get the current size of LVM /dev/rootvg/scribe by using lvdisplay command. It should show LV Size 389.97 GB
Currently the disk hard disk consists of just two partitions
/dev/cciss/c0d0p1 - This is configured as /boot partition and not part of LVM
/dev/cciss/c0d0p2 - Configured as part of LVM /dev/rootvg/scribe
# fdisk -l
Disk /dev/cciss/c0d0: 1199.8 GB, 1199865640960 bytes
255 heads, 63 sectors/track, 145875 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/cciss/c0d0p1 * 1 13 104391 83 Linux
/dev/cciss/c0d0p2 14 65283 524281275 8e Linux LVM
Now let us go about extending the Logical Volume /dev/rootvg/scribe by adding extra 600GB.
1) Create a partition of the unused 600GB
fdisk /dev/cciss/c0d0
p - to display the existing partition table
n - to create new partition
Once created
p - should display /dev/cciss/c0d0p3 as regular Linux partition
t - to convert newly created partition(/dev/cciss/c0d0p3) to lvm type
Enter partition number - 3(probably)
Hex code : 8e (Now the partition is converted to lvm type)
p - should show that /dev/cciss/c0d0p3 is of type lvm
w - to write the partition table to the disk
2) The newly added partition will not be visible on the system
Check the same using
ls /dev/cciss/ - We shall see that c0d0p3 is missing
partprobe - Running partprobe reloads the partition table and brings the partition up. No need to reboot the system.
ls /dev/cciss/ - We shall now see the c0d0p3
3) Now need to add /dev/cciss/c0d0p3 as part of physical volume(PV)
pvdisplay
This will show only the physical volume (/dev/cciss/c0d0p2)
PV Name /dev/cciss/c0d0p2
Now run the command
pvcreate /dev/cciss/c0d0p3
This command creates a header on each partition so it can be used for LVM.
Now run pvdisplay to see your new PV.
pvdisplay
It should now show
PV Name /dev/cciss/c0d0p2
PV Name /dev/cciss/c0d0p3
"VG Name" for /dev/cciss/c0d0p3 should be empty.
Since "/dev/cciss/c0d0p2 is already part of LVM, the "VG Name" for /dev/cciss/c0d0p2 will be displayed as rootvg
Need to add /dev/cciss/c0d0p3 as part of the volume group rootvg
4) Run the vgdisplay command to get the "VG Name"
vgdisplay
5) Use command vgextend to add the PV(/dev/cciss/c0d0p3) to the VG rootvg
vgextend rootvg /dev/cciss/c0d0p3
6) Run pvdisplay command to see the value of "VG Name" for PV /dev/cciss/c0d0p3. It shall display as rootvg
7) Run command vgdisplay to see the new size of the VG rootvg.
Mainly note the value of "VG size". It should be nearly 1TB.
Also note "Free PE / Size" and "Total PE". Earlier "Free PE / Size" shall be "0 / 0". Now it shall show some values.
8) Now comes the extension of Logical Volume /dev/rootvg/scribe
Run the command
lvdisplay
to get the names of existing Logical Volumes.
From "vgdisplay" command get the value of "Free PE/ Size". It will show the available "Physical Extent / Disk Size".
Now extend the Logical Volume "/dev/rootvg/scribe"
lvextend -l +19755 /dev/rootvg/scribe
(OR)
lvextend -L+617.34 /dev/rootvg/scribe
Run the command
lvdisplay
Check the "LV Size" for "LV Name : /dev/rootvg/scribe". It should be more than current "LV Size 389.97 GB".
--- Logical volume ---
LV Name /dev/rootvg/scribe
VG Name rootvg
LV UUID P08Qra-MnjE-5tgd-4Muw-c7r5-kY7o-6zUAu2
LV Write Access read/write
LV Status available
# open 1
LV Size 1007.31 GB
Current LE 32234
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
umount /scribe
e2fsck -f /dev/rootvg/scribe
resize2fs /dev/rootvg/scribe
mount -a
Use "df" command to see the new filesystem size
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/cciss/c0d0p1 99M 13M 81M 14% /boot
tmpfs 12G 0 12G 0% /dev/shm
/dev/mapper/rootvg-scribe
992G 407M 941G 1% /scribe
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