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--- linux:kvmqemu:expanddisk [2023/02/12 17:05] – created olaf
+++ linux:kvmqemu:expanddisk [2023/11/05 13:41] (current) – Added LVM extension olaf
@@ Line 1: / Line 1: @@
++===== KVM / QEMU Extend a virtual disk ======
+===== Extend a virtual disk with simple partition schema =====
+With the VM shut down directly extend the disk image on the host:
+<code bash>
+qemu-img resize virtual_disk.qcow2 +10G
+</code>
+Load the network block device driver into the kernel and attach the disk to the host
+<code bash>
+modprobe nbd
+qemu-nbd -c /dev/nbd0 virtual_disk.qcow2
+</code>
+Use a partition manager (gParted ...) to extend the partition
+Disconnect the virtual disk from the host
+<code bash>
+qemu-nbd -d /dev/nbd0
+</code>
+Start the VM and check if all is ok
+===== Extend a virtual disk with LVM partitions =====
+With the VM shut down directly extend the disk image on the host:
+<code bash>
+qemu-img resize virtual_disk.qcow2 +10G
+</code>
+Start the VM and login. \\
+As root or sudo:
+<code bash>
+lsblk
+</code>
+<code>
+NAME                MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
+sr0                  11:0    1  1024M  0 rom
+vda                 252:0    0   260G  0 disk
+├─vda1              252:1    0   600M  0 part /boot/efi
+├─vda2              252:2    0     1G  0 part /boot
+└─vda3              252:3    0 208.4G  0 part
+  ├─rhel_rhel8-root 253:0    0   180G  0 lvm  /
+  ├─rhel_rhel8-swap 253:1    0     4G  0 lvm  [SWAP]
+  └─rhel_rhel8-home 253:2    0  24.4G  0 lvm  /home
+</code>
+This shows the LVM partitions are on device vda, partition 3 (vda3)\\
+<code bash>
+pvs
+</code>
+<code>
+  PV         VG         Fmt  Attr PSize   PFree
+  /dev/vda3  rhel_rhel8 lvm2 a--  258.41g    0
+</code>
+The virtual device is ''/dev/vda3'' and the volume group is ''rhel_rehl8''
+Claim the free disk space for partition 3
+<code bash>
+growpart /dev/vda 3
+pvresize /dev/vda3
+</code>
+... and finally claim the available space for the root partition:
+<code bash>
+lvextend -r -l +100%FREE /dev/rhel_rhel8/root
+</code>
+Check if all went well:
+<code bash>
+lsblk
+</code>
+<code>
+NAME                MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
+sr0                  11:0    1  1024M  0 rom
+vda                 252:0    0   260G  0 disk
+├─vda1              252:1    0   600M  0 part /boot/efi
+├─vda2              252:2    0     1G  0 part /boot
+└─vda3              252:3    0 258.4G  0 part
+  ├─rhel_rhel8-root 253:0    0   230G  0 lvm  /
+  ├─rhel_rhel8-swap 253:1    0     4G  0 lvm  [SWAP]
+  └─rhel_rhel8-home 253:2    0  24.4G  0 lvm  /home
+</code>
+vda3 grew from 208.4 GB to 258.4 GB and the space was added to rhel_rhel8-root: it grew from 180 GB to 230 GB.
+Done.

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