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https://bugzilla.redhat.com/show_bug.cgi?id=952974
Bug 952974 - qemu-img resize of a qcow2 image file does not work for reducing the size. Summary: qemu-img resize of a qcow2 image file does not work for reducing the size.
https://forum.proxmox.com/threads/howto-change-virtual-size-of-a-qcow2-image.21995/
Dec 01, 2017 · qemu-img: qcow2 doesn't support shrinking images yet qemu-img: This image does not support resize So the only official way seems to be, converting the qcow2 image into a useless huge raw image , shrink that and convert it back to qcow2.
https://techpiezo.com/tech-insights/raw-vs-qcow2-disk-images-in-qemu-kvm/
Jun 19, 2019 · Raw disk image format is default format in Qemu. Pros of using RAW Disk Images: It is simple and portable to any other machine. It represents default binary format of a hard disk. Nearly raw performance then other formats, as it has very little overhead and no metadata and at last,
https://www.randomhacks.co.uk/how-to-resize-a-qcow2-harddrive-images/
Aug 14, 2013 · Anyhow here is a quick guide to resizing a qcow2 disk image. 1 – Shutdown the guest.. It’s important to shutdown the vm properly rather than pausing it or forcing it to a stop because you need the file system to be a perfect condition before resizing it.
https://computernewb.com/wiki/How_to_create_a_disk_image_in_QEMU
QEMU can recognize and read several different file formats, but this section will list the ones you can create with qemu-img. qcow2 . The recommended file format. It is fast, dynamically allocated, and has decent support in QEMU. However it does have a minor speed loss compared to raw, but this is unnoticeable in normal use. qcow . This is an ...
https://forum.proxmox.com/threads/unexpected-error-image-is-not-in-qcow2-format.26120/
Feb 22, 2016 · Despite the name says it is a qcow2 and in the in the config file it is indicated as qcow2, it is a raw image. Proxmox2 probably don't care of this My main mistake was to believe in what I had found in the config file, and also that changing it to raw format (name and parameter in config), the VM doesn't …
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_deployment_and_administration_guide/sect-using_qemu_img-supported_qemu_img_formats
qcow2 - QEMU image format, the most versatile format with the best feature set. Use it to have optional AES encryption, zlib-based compression, support of multiple VM snapshots, and smaller images, which are useful on file systems that do not support holes . Note that this expansive feature set comes at the cost of performance.
https://serverfault.com/questions/851389/how-to-repair-a-broken-resized-qcow2-disk-image-for-libvirt-kvm
Today I wanted to increase the size of a VM, so I did what I always do (have done it before): qemu-img resize diskimage.qcow2 +22GB Then the file broke and the VM does not start any more. I tried booting the VM from CD to adjust partitioning but the system will not read the disk any more:
https://stackoverflow.com/questions/44665939/using-qemu-img-2-8-how-to-convert-raw-image-to-a-luks-encryption-qcow-image
Jul 11, 2017 · It current GIT master, there's a slight improvement - you can now use LUKS images as the target provided that you pre-create the LUKS image. First use 'qemu-img create' to create an empty luks image with no data written, then convert to it. First I have some random qcow2 image I previously created $ qemu-img create -f qcow2 demo.qcow2 10M
https://linux.die.net/man/1/qemu-img
Use "qemu-img info" to know the real size used by the image or "ls -ls" on Unix/Linux. host_device Host device format. This format should be used instead of raw when converting to block devices or other devices where "holes" are not supported. qcow2 QEMU image format, the most versatile format.
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