Extend LVM on qcow2 images

Process

• qemu-img resize -> virt-resize -> lvextend --resizefs

Examples

• Example using virt-resize: https://fatmin.com/2016/12/20/how-to-resize-a-qcow2-image-and-filesystem-with-virt-resize/
• https://www.technomenace.com/2014/08/how-to-extend-lvm-on-qcow2-images/

Commands

• qemu-img resize c845ba080f2326a51c53965af1ac6c18 +3G
• qemu-img info
• Modify partition with: fdisk /dev/vdX + Reboot
• pvresize /dev/vdX# (Expand a PV after enlarging the partition)
• lvextend -L +1.8G /dev/mapper/VolGroup-lv_root
• resize2fs /dev/mapper/VolGroup-lv_root

Activities

• Read about raw files and qcow2 differences: https://www.berrange.com/posts/2017/02/10/the-surprisingly-complicated-world-of-disk-image-sizes/

Related

• Kubernetes PVC resize: kubectl patch pvc

See also

• qemu-img: qemu-img info, qemu-img check, qemu-img resize, qemu-img create, qcow2, qemu-img rebase, qemu-img convert, qemu-img commit, qemu-img ammend
• Qcow file format
• KVM, Installation, QEMU, virsh, virtinst, libguestfs-tools, libvirt, qemu, Red Hat Virtualization (RHV), MacVTap, Virtio, oVirt, KVM services, KVM networking, KVM graphics, CPU, KVM on ARM
• virt-resize
• LVM: LVM errors LVM scan commands lkvmetad, Add a new disk

scan: pvscan vgscan

LVM: lvs lvmscan lvm fullreport lvmreport lvmconfig lvmdump lvmcheck lvm dumpconfig

Scan: pvs vgs lvs pvscan vgscan

PV: pvcreate pvremove pvscan pvremove pvscan pvs pvchange pvck pvdisplay pvresize

LV: lvdisplay lvcreate lvremove, lvresize, lvextend, lvreduce, lvrename

VG: vgdisplay,vgcreate,vgremove, vgextend, vgreduce, vgscan, vgchange, vgrename, vgcfgbackup, vgcfgrestore, vgimportclone, vgck

Check commands: pvck vgck