# Resizing in LVM

**URL:** <https://community.learnlinux.tv/t/resizing-in-lvm/4005>\
**Category:** Linux on Servers\
**Created:** [June 26, 2024, 3:56am UTC](https://community.learnlinux.tv/t/resizing-in-lvm/4005 "2024-06-26T03:56:35Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![adelaide-Guy](https://community.learnlinux.tv/letter_avatar_proxy/v4/letter/a/b4bc9f/32.png) [@adelaide-Guy](https://community.learnlinux.tv/u/adelaide-Guy)\
**Post date:** [June 26, 2024, 3:56am UTC](https://community.learnlinux.tv/t/resizing-in-lvm/4005/1 "2024-06-26T03:56:35Z")

</div>

I have a linux lab machine, having 2 vmdisk. I have configured the 2 disk to participate in LVM.

If I want to increase the capacity either 1 or both disk, how can I detect this changes in LVM? running pvscan does not see the changes but if I ran lsblk it see that the disk increased.

```auto
admin@Portainer ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sr0 11:0 1 7.9G 0 rom
xvda 202:0 0 40G 0 disk
├─xvda1 202:1 0 1M 0 part
├─xvda2 202:2 0 500M 0 part /boot
└─xvda3 202:3 0 27.8G 0 part
  ├─vg--01-root 253:0 0 20G 0 lvm /
  └─vg--01-var 253:2 0 20G 0 lvm /var
xvdb 202:16 0 40G 0 disk
└─xvdb1 202:17 0 28.2G 0 part
  ├─vg--01-root 253:0 0 20G 0 lvm /
  └─vg--01-swap 253:1 0 16G 0 lvm [SWAP]

```

```auto
admin@Portainer ~]$ sudo pvdisplay
  --- Physical volume ---
  PV Name /dev/xvda3
  VG Name vg-01
  PV Size <27.76 GiB / not usable 3.00 MiB
  Allocatable yes (but full)
  PE Size 4.00 MiB
  Total PE 7105
  Free PE 0
  Allocated PE 7105
  PV UUID cidyAY-mSHk-vN2t-7CpV-0cYm-zDt2-pnoy3d

  --- Physical volume ---
  PV Name /dev/xvdb1
  VG Name vg-01
  PV Size <28.25 GiB / not usable 0
  Allocatable yes (but full)
  PE Size 4.00 MiB
  Total PE 7231
  Free PE 0
  Allocated PE 7231
  PV UUID j4dPQH-s9DI-movi-85c1-DCLR-CEim-QBAEgc

```

---

<div class="post-metadata">

**Author:** ![ThatGuyB](https://community.learnlinux.tv/user_avatar/community.learnlinux.tv/thatguyb/32/784_2.png) [@ThatGuyB](https://community.learnlinux.tv/u/ThatGuyB)\
**Post date:** [June 26, 2024, 12:37pm UTC](https://community.learnlinux.tv/t/resizing-in-lvm/4005/2 "2024-06-26T12:37:50Z")

</div>

I hope you realize that if you lose 1 disk, you lose all your data (keep backups somewhere else). And reminder to take a backup before you begin.

There are different methods here:

- create new partitions out of the empty space and add them to LVM (online operation)
- resize the existing partitions (offline)

The first one is as easy as `fdisk /dev/xdy` create a partition, `pvcreate /dev/xdy-new-partition`, then vgextend and lvresize or lvextend.

The second one is preferable (less metadata in LVM), but the first one isn’t a huge deal (the above was the method I used, because it was online, but it only works well if you have a gpt partition table).

The second one involves shutting down the system, booting a rescue disk, if you have something that has a GUI and gparted, that’s a big help, you can just resize the partition in gparted. Then pvdisplay will show the correct size. Then you follow the same steps to vgextend and lvresize.