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increase virtual disk with lvm

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After moving to a new VM platform I had a large amount of data to transfer from the old host to a new disk on a VM. In order to work within the availalbe space I had to transfer a lot of data, delete it from the host and then grow the disk on the VM so I could transfer the rest of the data over.

First step was to add the initial disk to the VM and bring it online and get it mounted.

Stage 1: Existing Disk

As I'm just using the entire disk I created a disk using all the available space and a mount point /media to mount the disk on.

sudo fdisk /dev/sdb
sudo pvcreate /dev/sdb1
sudo vgcreate vg-media /dev/sdb1
sudo lvcreate -n lv-media --size 99G vg-media
sudo mkfs.ext4 /dev/vg-media/lv-media

Once the disk was ready I added an entry in /etc/fstab

Next we increase the disk size through the host (Proxmox in this case).

Stage 2: Extend disk

Now we need to extend the existing disk to avail of the new space. Foist we increase the partition using growpart

admin01@jelly-01:~$ lsblk
sdb                         8:16   0  200G  0 disk 
└─sdb1                      8:17   0  100G  0 part 
  └─vg--media-lv--media   253:1    0   99G  0 lvm  /media

admin01@jelly-01:~$ sudo growpart /dev/sdb 1
CHANGED: partition=1 start=2048 old: size=209713152 end=209715200 new: size=419428319 end=419430367

admin01@jelly-01:~$ lsblk
sdb                         8:16   0  200G  0 disk 
└─sdb1                      8:17   0  200G  0 part 
  └─vg--media-lv--media   253:1    0   99G  0 lvm  /media

Next we increase the volume

admin01@jelly-01:~$ sudo lvextend -r -l +100%FREE /dev/vg-media/lv-media
  Size of logical volume vg-media/lv-media changed from 99.00 GiB (25344 extents) to <200.00 GiB (51199 extents).
  Logical volume vg-media/lv-media successfully resized.
resize2fs 1.46.5 (30-Dec-2021)
Filesystem at /dev/mapper/vg--media-lv--media is mounted on /media; on-line resizing required
old_desc_blocks = 13, new_desc_blocks = 25
The filesystem on /dev/mapper/vg--media-lv--media is now 52427776 (4k) blocks long.

admin01@jelly-01:~$ sudo vgs
  VG        #PV #LV #SN Attr   VSize    VFree 
  vg-media    1   1   0 wz--n- <200.00g     0

And that's it, now we can start copying more data over :)

  • note the PV was auto-expaanded, if this does not happen it can be done with sudo pvresize /dev/sdb1 before increasing the LVM size.