How do I resize a KVM disk?

How do I resize a KVM disk?

13 Answers

1. stop the VM.
2. run qemu-img resize vmdisk.img +10G to increase image size by 10Gb.
3. start the VM, resize the partitions and LVM structure within it normally.

How do I resize an image in QCOW?

Due to the design of qcow2 images, you don’t even need to have the disk space available right away.

1. Shut down the virtual machine.
2. Resize the image with qemu-img resize image.qcow2 +SIZE. where SIZE is the size (e.g. 10G for 10 gibibytes).
3. Boot into an external live OS and resize the partition.

How do you shrink QCOW?

In order to shrink the *. qcow2 files you’ve two options, enable TRIM support or zero out all free space of the partitions contained within the guest and then reconvert the image with qemu-img. IMPORTANT WARNING: Always have offsite backups ready, you never know!

How do I shrink a KVM disk image?

Shrink the file system(s) *don’t do this on a live system, I recommend using a live cd. Create a new disk image of desired size. Run a live os, with the new and old images attached as (virtual) hard disks (not mounted) Create the new partition(s) the same size as the resized partitions on the old disk.

What is QEMU-IMG?

Description. qemu-img allows you to create, convert and modify images offline. It can handle all image formats supported by QEMU. Also, be aware that querying an image that is being modified by another process may encounter inconsistent state.

What is KVM format?

What virtual disk formats can KVM use? KVM inherits a wealth of disk formats support from QEMU; it supports raw images, the native QEMU format (qcow2), VMware format, and many more.

How do I shrink a QEMU image?

Shrink the image (. img) file

1. Locate your . img file.
2. Make a copy of your VM’s . img file.
3. Shrink the image to the size you want it to be. Remember, this has to be bigger than the total size of the Windows partitions on the disk.
4. Restart your VM and make sure it launches correctly.

Is QCOW compressed?

The QCOW format supports compression by allowing each cluster to be independently compressed with zlib.

How do I reduce the size of my VDI?

How to Shrink a VirtualBox Virtual Machine and Free Up Disk Space

1. Step One: Ensure You’re Using a Dynamic Disk.
2. Step Two: Write Zeros to the Disk in The Virtual Machine.
3. Step Three: Find the VBoxManage Command.
4. Step Four: Locate the Path to the Disk You Want To Compact.
5. Step Five: Compact the Disk.

How to resize qcow2 image using Virt-resize and qemu img?

Resize qcow2 Image with virt-resize. Step 1: Prerequisites; Step 2: Shutdown Your VM; Step 3: Take the Backup of qcow2 image; Step 4: Create a Raw Image using qemu-img command; Step 5: Resize Original qcow2 using virt-resize command; Step 6: Start Virtual Machine using virsh command

Do you need to add disk space to KVM?

I personally use KVM for all Linux virtualization projects. Sometimes I need to extend or add disk space to my running VM (guest) to satisfy growing software requirements. KVM uses QEMU which supports several image types, among them raw, cow, qcow, qcow2, vmdk, vdi among others available.

What kind of image can I use in KVM?

KVM uses QEMU which supports several image types, among them raw, cow, qcow, qcow2, vmdk, vdi among others available. The “native” and most flexible type is qcow2, which supports copy on write, encryption, compression, and VM snapshots. Before you can extend your guest machine Virtual disk, you need to first shut it down.