Proxmox Resize LVM Disk
I find it convenient to start a VM from a cloud-init enabled template I've built which pre-configures the machine with my SSH credentials, networks and so on. At this point, everything is configurable again before I boot in terms of hardware, except for the Disk! We can increase Disk size, but the LVM doesn't automatically update. This information is available elsewhere but I find myself putting together 2-3 sources to get my result each time, so I'm documenting my process here. Hopefully it helps someone else as well!
Starting Point
Create a full clone of the template:
Enter the hardware section of the clone, and resize the disk:
Now, start the machine and get shell a shell on the system.
Evaluation
Check free space available with fdisk
$ sudo !!
sudo fdisk -l
GPT PMBR size mismatch (16777215 != 3145727999) will be corrected by write.
The backup GPT table is not on the end of the device. This problem will be corrected by write.
Disk /dev/sda: 1.48 TiB, 1610612736000 bytes, 3145728000 sectors
Disk model: QEMU HARDDISK
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 9DAC2783-E920-45AB-9827-39DED54CE6A8
Device Start End Sectors Size Type
/dev/sda1 2048 4095 2048 1M BIOS boot
/dev/sda2 4096 2101247 2097152 1G Linux filesystem
/dev/sda3 2101248 16775167 14673920 7G Linux filesystem
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 6.102 GiB, 7511998464 bytes, 14671872 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
/dev/sda is 1.48Tb, but our lv is only 6.102 Gb
Extend Physical Drive Partition
$ growpart /dev/sda 3
Update PV
# View starting PV
$ pvdisplay
--- Physical volume ---
PV Name /dev/sda3
VG Name ubuntu-vg
PV Size <7.00 GiB / not usable 0
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 1791
Free PE 0
Allocated PE 1791
PV UUID cJxkPB-wQVI-cAMV-jkNc-CDz3-fQ2Y-y3emxI
# Instruct LVM that disk size has changed
$ sudo pvresize /dev/sda3
# Check new PV
$ pvdisplay
--- Physical volume ---
PV Name /dev/sda3
VG Name ubuntu-vg
PV Size 1.46 TiB / not usable 16.50 KiB
Allocatable yes
PE Size 4.00 MiB
Total PE 383743
Free PE 381952
Allocated PE 1791
PV UUID cJxkPB-wQVI-cAMV-jkNc-CDz3-fQ2Y-y3emxI
Extend LV
# View starting LV
$ lvdisplay
--- Logical volume ---
LV Path /dev/ubuntu-vg/ubuntu-lv
LV Name ubuntu-lv
VG Name ubuntu-vg
LV UUID KfMCNz-e2DU-eUXJ-vXA8-Uk0q-DDTW-vnfE27
LV Write Access read/write
LV Creation host, time ubuntu-server, 2021-06-13 15:24:01 +0000
LV Status available
# open 1
LV Size <7.00 GiB
Current LE 1791
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
# Resize LV
$ sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from <7.00 GiB (1791 extents) to 1.46 TiB (383743 extents).
Logical volume ubuntu-vg/ubuntu-lv successfully resized.
# View changed LV
$ lvdisplay
--- Logical volume ---
LV Path /dev/ubuntu-vg/ubuntu-lv
LV Name ubuntu-lv
VG Name ubuntu-vg
LV UUID KfMCNz-e2DU-eUXJ-vXA8-Uk0q-DDTW-vnfE27
LV Write Access read/write
LV Creation host, time ubuntu-server, 2021-06-13 15:24:01 +0000
LV Status available
# open 1
LV Size 1.46 TiB
Current LE 383743
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
Resize Filesystem
$ resize2fs /dev/ubuntu-vg/ubuntu-lv
resize2fs 1.45.5 (07-Jan-2020)
Filesystem at /dev/ubuntu-vg/ubuntu-lv is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 188
The filesystem on /dev/ubuntu-vg/ubuntu-lv is now 392952832 (4k) blocks long.
# Confirm results
$ fdisk -l
...
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 1.47 TiB, 1609534799872 bytes, 3143622656 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
