How to extend Root Partition in LVM
I had an adhoc plan to install latest version of OEM13C on
my existing RAC VM’s instead of creating a dedicated machine for OEM. But, Root
filesystem space about to exhaust and I felt there is no room for one Repository
DB. Initially I added 20GB of normal disks to each of the VM’s and Just
followed the below steps to extend the root partition.
[root@vm2 ~]# df -h
Filesystem
Size Used Avail Use% Mounted on
/dev/mapper/vg_vm1-lv_root
36G 25G 8.6G
75% /
tmpfs
12G 1.6G 11G
14% /dev/shm
/dev/sda1
485M 110M 351M
24% /boot
Root partition has only 8.6 GB of free space; I am going to
extend this now.
Newly added disk sdl
Disk /dev/sdl: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Logical Volume information
[root@vm2 ~]# lvs
LV VG
Attr LSize Pool Origin Data% Meta%
Move Log Cpy%Sync Convert
lv_root vg_vm1
-wi-ao---- 35.57g
lv_swap vg_vm1
-wi-ao---- 3.94g
Follow the below steps to create partition on the new disk
and change partition type from Linux to LVM(8e)
[root@vm2 ~]# fdisk /dev/sdl
Device contains neither a valid DOS partition table, nor Sun,
SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x6d8ac917.
Changes will remain in memory only, until you decide to write
them.
After that, of course, the previous content won't be
recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be
corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly
recommended to
switch off the
mode (command 'c') and change display units to
sectors (command
'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4):
Value out of range.
Partition number (1-4):
Value out of range.
Partition number (1-4): 1
First cylinder (1-2610, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-2610, default
2610):
Using default value 2610
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
My already mounted filesystem is of type ext4. So, formatting the newly created partition
using the below command.
[root@vm2 ~]# mkfs.ext4 /dev/sdl1
mke2fs 1.43-WIP (20-Jun-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1310720 inodes, 5241198 blocks
262059 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
160 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304,
163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
Initialize the newly created partition as physical volume
[root@vm2 ~]# pvcreate /dev/sdl1
Physical volume
"/dev/sdl1" successfully created
Check the Volume Groups using the below command
[root@vm2 ~]# vgs
VG #PV #LV #SN Attr VSize
VFree
vg_vm1 1
2 0 wz--n- 39.51g 0
Extend the new Volume Group with new Physical Volume
[root@vm2 ~]# vgextend vg_vm1 /dev/sdl1
Volume group
"vg_vm1" successfully extended
Extend the Logical Volume (lv_root) with all Free space of
VG.
[root@vm2 ~]# lvextend -l +100%FREE /dev/vg_vm1/lv_root
Size of logical volume
vg_vm1/lv_root changed from 35.57 GiB (9106 extents) to 55.56 GiB (14224
extents).
Logical volume lv_root
successfully resized.
Finally Resize the Filesystem
[root@vm2 ~]# resize2fs /dev/vg_vm1/lv_root
resize2fs 1.43-WIP (20-Jun-2013)
Filesystem at /dev/vg_vm1/lv_root is mounted on /; on-line
resizing required
old_desc_blocks = 3, new_desc_blocks = 4
Performing an on-line resize of /dev/vg_vm1/lv_root to 14565376
(4k) blocks.
The filesystem on /dev/vg_vm1/lv_root is now 14565376 blocks
long.
Verify the filesystem size
[root@vm2 ~]# df -h
Filesystem
Size Used Avail Use% Mounted on
/dev/mapper/vg_vm1-lv_root
55G 25G 28G
48% /
tmpfs
12G 1.6G 11G
14% /dev/shm
/dev/sda1
485M 110M 351M
24% /boot
[root@vm2 ~]# lvs
LV VG
Attr LSize Pool Origin Data% Meta%
Move Log Cpy%Sync Convert
lv_root vg_vm1
-wi-ao---- 55.56g
lv_swap vg_vm1
-wi-ao---- 3.94g
[root@vm2 ~]# vgs
VG #PV #LV #SN Attr VSize
VFree
vg_vm1 2
2 0 wz--n- 59.50g 0
