[2024-feb-29] Sad news: Eric Layton aka Nocturnal Slacker aka vtel57 passed away on Feb 26th, shortly after hospitalization. He was one of our Wiki's most prominent admins. He will be missed.
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| howtos:emulators:kvm_libvirt_qemu_quirks_tips_etc [2023/11/05 20:46 (UTC)] – another section added zeebra | howtos:emulators:kvm_libvirt_qemu_quirks_tips_etc [2023/11/05 20:50 (UTC)] (current) – [QEMU QCOW2 freed virtual disk space doesn't shrink image] zeebra | ||
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| === How to manually shrink the QCOW2 image to reflect the content on the virtual disk image === | === How to manually shrink the QCOW2 image to reflect the content on the virtual disk image === | ||
| - | 1. Inside the virtual machine, write zeroes to a file until the disk is full | + | 1. Inside the virtual machine, write zeroes to a file until the virtual |
| < | < | ||
| dd if=/ | dd if=/ | ||
| Line 53: | Line 53: | ||
| 3. Shut down the virtual machine | 3. Shut down the virtual machine | ||
| - | 4. You can use the convert image function to basically move the current image into a new image (convert from qcow2 to qcow2), and it will reflect the actual size of content (disregard | + | 4. You can use the convert image function to basically move the current image into a new image (convert from qcow2 to qcow2), and it will reflect the actual size of content (throw away zeroes). In a terminal: |
| < | < | ||
| qemu-img convert -O qcow2 oldimage.qcow2 newimage.qcow2 | qemu-img convert -O qcow2 oldimage.qcow2 newimage.qcow2 | ||
