How to extend LVM in Linux
Firstly, you can check your Physical Volumes, Volume Groups and Logical Volumes with commands:
Physical Volumes
Volume Groups
Logical Volumes
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos_centos7 -wi-ao---- <17.00g
swap centos_centos7 -wi-ao---- 2.00g
For adding a new Physical Volume we have to find the name of a new volume. We can use the following command to locate it:
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000b3a0f
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos_centos7-root: 18.2 GB, 18249416704 bytes, 35643392 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos_centos7-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Now, it’s time to configure our new disk.
To create new partition Press n
Choose primary partition user p
Change the type using t
Type 8e to change the partition type to Linux LVM
Use p to print the create partition
Press w to write the changes
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x38e14a7a.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-20971519, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519):
Using default value 20971519
Partition 1 of type Linux and of size 10 GiB is set
Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
Next, create new Physical Volume
Verify the physical volume using the below command:
PV VG Fmt Attr PSize PFree
/dev/sda2 centos_centos7 lvm2 a-- <19.00g 0
/dev/sdb1 lvm2 --- <10.00g <10.00g
Add this pv to centos volume group to extend the size of a volume group to get more space:
It’s time to extend logical volume. If you would like to extend your logical volume with all free available space type the following command:
Size of logical volume centos_centos7/root changed from <17.00 GiB (4351 extents) to 26.99 GiB (6910 extents).
Logical volume centos_centos7/root successfully resized.
Last thing to do. Re-sizing the file system we use:
meta-data=/dev/mapper/centos_centos7-root isize=512 agcount=4, agsize=1113856 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=4455424, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 4455424 to 7075840
You are good. That’s all that you need to extend logical volume on CentOS. If you want to confirm that, just check it with the following commands:
PV VG Fmt Attr PSize PFree
/dev/sda2 centos_centos7 lvm2 a-- <19.00g 0
/dev/sdb1 centos_centos7 lvm2 a-- <10.00g 0
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos_centos7 -wi-ao---- 26.99g
swap centos_centos7 -wi-ao---- 2.00g
Thanks!