Tuesday, 1 March 2022

How to Extend a Logical Volume on CentOS 7

Sometime encountered with no space left on file system error and demand opened to increase file system space. It would be easy if file system is created under LVM.

This article describes How to Extend a Logical Volume on CentOS 7.

[root@slave-dns ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
[root@slave-dns ~]#

Step 1. View the Free Space in Volume Group: Run the below vgs command to make sure free space is available in the Volume Group:

[root@slave-dns ~]# vgs
  VG     #PV #LV #SN Attr   VSize   VFree
  centos   3   2   0 wz--n- <24.99g <8.00g
[root@slave-dns ~]#

8GB unallocated space left the Volume Group centos.

Step2. Extend Logical Volume: Run the below lvextend command to extend logical volume:

[root@slave-dns ~]# lvextend -L +5G /dev/mapper/centos-root
  Size of logical volume centos/root changed from 15.99 GiB (4094 extents) to 20.99 GiB (5374 extents).
  Logical volume centos/root successfully resized.
[root@slave-dns ~]#

Step 3. Resize Logical Volume: Run the below command to check the file system type and resize file system size accordingly:

[root@slave-dns ~]# df -hT /
Filesystem              Type  Size  Used Avail Use% Mounted on
/dev/mapper/centos-root xfs    16G  1.6G   15G  10% /
[root@slave-dns ~]#

Check the file system type as above if file system type if ext2/ext3/ext4, run resize2fs command or if it is xfs file system as it is default file system type in CentOS 7 run the below command to resize/extend the file system:

[root@slave-dns ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=8, agsize=524032 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=4192256, 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 4192256 to 5502976
[root@slave-dns ~]#

Step 4. Verify the Extended Logical Volume: Run the following command to validate the extended size of logical volume:

[root@slave-dns ~]# df -hT /
Filesystem              Type  Size  Used Avail Use% Mounted on
/dev/mapper/centos-root xfs    21G  1.6G   20G   8% /
[root@slave-dns ~]#

Done!!! Now the / file system/logical volume space is extended from 16 GB to 21 GB.

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