Hi Techies, one of the advantages of LVM partition is that it can be resized online without any downtime. Here resize means increasing and reducing lvm partition size. Though it is not recommended to reduce lvm partition as it may leads to data corruption.
In this post, we will demonstrate how to extend or increase LVM partition’s size in linux using lvextend command. For the demonstration, we have ‘/dev/vg01-lv01’ partition of size 10 GB and mounted on /data folder.
$ df -Th /data/ Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/vg01-lv01 ext4 9.8G 37M 9.3G 1% /data $
Let’s assume we want to increase the size from 10 GB to 15GB. Also, we don’t have free space available in volume group vg01.
$ sudo vgs vg01 VG #PV #LV #SN Attr VSize VFree vg01 1 1 0 wz--n- <10.00g 4.00m $
Let’s deep dive into the steps,
Step 1) Attach New disk to Linux System
Attach 5 GB disk to your linux system, once it is attached make sure it is available at operating system level.
Run lsblk and ‘fdisk -l’ command to verify,
$ lsblk | grep -i sd
$ sudo fdisk -l
Above output confirms that new disk ‘/dev/sdc’ of size 5 GB is detected at OS level.
Step 2) Create Physical Volume (PV)
Create PV on /dev/sdc disk using pvcreate command,
$ sudo pvcreate /dev/sdc Physical volume "/dev/sdc" successfully created. $ sudo pvs /dev/sdc PV VG Fmt Attr PSize PFree /dev/sdc lvm2 --- 5.00g 5.00g $
Step 3) Extend Volume Group
To extend volume group, add new pv (/dev/sdc) to the volume group (vg01) using vgextend command
$ sudo vgextend vg01 /dev/sdc Volume group "vg01" successfully extended $
Once the volume group is extended then verify its size using vgs command,
$ sudo vgs VG #PV #LV #SN Attr VSize VFree vg01 2 1 0 wz--n- 14.99g 5.00g $
Above output confirms that now we have 5 GB free space in the volume group.
Step 4) Extend Logical Volume (LV)
Identify the LV using lvs command,
$ sudo lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv01 vg01 -wi-ao---- 9.99g $
In case of Ext4 LVM file system, run following commands to increase the size on line
$ sudo lvextend -L +4.99G /dev/vg01/lv01 $ sudo resize2fs /dev/vg01/lv01 $ df -Th /data
Great, above output clearly confirms that file system size has been increased from 10 GB to 15 GB.
In case of XFS LVM file system, run following command,
$ sudo lvextend -L +4.99G /dev/vg01/lv01 -r
Above command will extend and resize the file system in one go.
That’s all from this post, I hope you have found it informative. Please do share your feedback and queries in below comments section.
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