Situantion
Need Resize Ubuntu VM Disk In KVM
How To
Check Disk Info
~ # qemu-img info /data/img/demo
image: /data/img/demo
file format: qcow2
virtual size: 20 GiB (21474836480 bytes)
disk size: 3.29 GiB
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: true
refcount bits: 16
corrupt: false
Resize Disk
~ # qemu-img resize /data/img/demo +180G
Image resized.
~ # qemu-img info /data/img/demo
image: /data/img/demo
file format: qcow2
virtual size: 200 GiB (214748364800 bytes)
disk size: 3.29 GiB
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: true
refcount bits: 16
corrupt: false
Start VM And Resize Block
~ # virsh start demo
Domain demo started
~ # virsh blockresize anthos /data/img/demo 200G
Block device '/data/img/demo' is resized
Login VM And Check Disk Use fdisk
root@demo:/home/user# cd
root@demo:~# fdisk -l
.
.
.
GPT PMBR size mismatch (41943039 != 419430399) 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/vda: 200 GiB, 214748364800 bytes, 419430400 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
Disklabel type: gpt
Disk identifier: 1234123123123-3333-4444-5555-12312321321321
Device Start End Sectors Size Type
/dev/vda1 2048 4095 2048 1M BIOS boot
/dev/vda2 4096 2101247 2097152 1G Linux filesystem
/dev/vda3 2101248 41940991 39839744 19G Linux filesystem
Check Disk Use lsblk
root@demo:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 55.4M 1 loop /snap/core18/2128
loop1 7:1 0 55.5M 1 loop /snap/core18/2344
loop2 7:2 0 61.9M 1 loop /snap/core20/1434
loop3 7:3 0 44.7M 1 loop /snap/snapd/15534
loop4 7:4 0 67.8M 1 loop /snap/lxd/22753
loop5 7:5 0 70.3M 1 loop /snap/lxd/21029
sr0 11:0 1 1024M 0 rom
vda 252:0 0 200G 0 disk
├─vda1 252:1 0 1M 0 part
├─vda2 252:2 0 1G 0 part /boot
└─vda3 252:3 0 19G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 19G 0 lvm /
Check Disk Use pvs
root@demo:~# pvs
PV VG Fmt Attr PSize PFree
/dev/vda3 ubuntu-vg lvm2 a-- <19.00g 0
Use growpart Rewrite Partition
root@demo:~# growpart /dev/vda 3
CHANGED: partition=3 start=2101248 old: size=39839744 end=41940992 new: size=417329119 end=419430367
Verify Use lsblk
root@demo:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 55.4M 1 loop /snap/core18/2128
loop1 7:1 0 55.5M 1 loop /snap/core18/2344
loop2 7:2 0 61.9M 1 loop /snap/core20/1434
loop3 7:3 0 44.7M 1 loop /snap/snapd/15534
loop4 7:4 0 67.8M 1 loop /snap/lxd/22753
loop5 7:5 0 70.3M 1 loop /snap/lxd/21029
sr0 11:0 1 1024M 0 rom
vda 252:0 0 200G 0 disk
├─vda1 252:1 0 1M 0 part
├─vda2 252:2 0 1G 0 part /boot
└─vda3 252:3 0 199G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 19G 0 lvm /
Resize PV
root@demo:~# pvresize /dev/vda3
Physical volume "/dev/vda3" changed
1 physical volume(s) resized or updated / 0 physical volume(s) not resized
root@demo:~# pvs
PV VG Fmt Attr PSize PFree
/dev/vda3 ubuntu-vg lvm2 a-- <199.00g 180.00g
root@demo:~# vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <199.00g 180.00g
Resize Logincal Volume Use lvextend And Verify That
root@demo:~# lvextend -r -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from <19.00 GiB (4863 extents) to <199.00 GiB (50943 extents).
Logical volume ubuntu-vg/ubuntu-lv successfully resized.
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 = 3, new_desc_blocks = 25
The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 52165632 (4k) blocks long.
root@demo:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 1.9G 0 1.9G 0% /dev
tmpfs 394M 1.1M 393M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 196G 4.5G 184G 3% /
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/loop0 56M 56M 0 100% /snap/core18/2128
/dev/loop1 56M 56M 0 100% /snap/core18/2344
/dev/loop2 62M 62M 0 100% /snap/core20/1434
/dev/loop3 45M 45M 0 100% /snap/snapd/15534
/dev/loop4 68M 68M 0 100% /snap/lxd/22753
/dev/vda2 976M 107M 803M 12% /boot
/dev/loop5 71M 71M 0 100% /snap/lxd/21029
tmpfs 394M 0 394M 0% /run/user/1000
