I have a oVirt server with a VM, the VM was created with a 20GB disk but that quickly ran out of space so I added another 20GB to it and now I'm trying to expand the disk.
I have done this once before on an old VM and then I ran the following commands:
$ sudo lvm
lvm> lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from 4.00 GiB (1024 extents) to <49.00 GiB (12543 extents).
Logical volume ubuntu-vg/ubuntu-lv successfully resized.
lvm> exit
Exiting.
$ sudo lvm
lvm> lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from 4.00 GiB (1024 extents) to <49.00 GiB (12543 extents).
Logical volume ubuntu-vg/ubuntu-lv successfully resized.
lvm> exit
Exiting.
$ sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs 1.45.5 (07-Jan-2020)
Filesystem at /dev/mapper/ubuntu--vg-ubuntu--lv is mounted on /; on-line resizing required old_desc_blocks = 1, new_desc_blocks = 7
The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 12844032 (4k) blocks long.
$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 949M 0 949M 0% /dev
tmpfs 199M 1.2M 198M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 49G 3.8G 43G 9% /
tmpfs 993M 0 993M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 993M 0 993M 0% /sys/fs/cgroup
/dev/sda2 976M 107M 803M 12% /boot
/dev/loop0 28M 28M 0 100% /snap/snapd/7264
/dev/loop1 55M 55M 0 100% /snap/core18/1705
/dev/loop2 69M 69M 0 100% /snap/lxd/14804
/dev/loop3 33M 33M 0 100% /snap/snapd/12159
/dev/loop4 56M 56M 0 100% /snap/core18/2074
/dev/loop5 62M 62M 0 100% /snap/core20/1026
/dev/loop6 67M 67M 0 100% /snap/lxd/20840
tmpfs 199M 0 199M 0% /run/user/1000
And that expanded the disk but now for some reason on my new VM these commands does not work and I get the following output:
$ sudo lvm
lvm> lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
New size (4863 extents) matches existing size (4863 extents).
lvm>
$ sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs 1.45.5 (07-Jan-2020)
The filesystem is already 4979712 (4k) blocks long. Nothing to do!
Looking into fdisk -l
I have the following:
Disk /dev/loop0: 54.97 MiB, 57614336 bytes, 112528 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
Disk /dev/loop1: 55.45 MiB, 58134528 bytes, 113544 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
Disk /dev/loop2: 61.79 MiB, 64770048 bytes, 126504 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
Disk /dev/loop3: 68.26 MiB, 71573504 bytes, 139792 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
Disk /dev/loop4: 68.17 MiB, 71475200 bytes, 139600 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
Disk /dev/loop5: 27.9 MiB, 28405760 bytes, 55480 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
Disk /dev/loop6: 32.3 MiB, 33865728 bytes, 66144 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
Disk /dev/sda: 40 GiB, 42949672960 bytes, 83886080 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: EFA99D35-85DD-4D0D-A4DE-19514BF6AE89
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 41940991 39839744 19G Linux filesystem
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 18.102 GiB, 20396900352 bytes, 39837696 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
Best Answer
You haven't expanded the disk partition yet. This is the first step and for some reason you are trying to skip it (and another mandatory step).
Use the
growpart
tool to expand the partition safely. Remember that it takes the block device and partition number as separate arguments.Install it if you don't already have it installed.
Once that is done you can move on to resizing the PV and then the LV.