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VirtualBox/KVM: Reduce VM sizes

27th March 2021 DavidFilesystems, KVM, Linux, VirtualisationLeave a Comment on VirtualBox/KVM: Reduce VM sizes

There are two utilities that can help discard unused blocks so that VMs can be shrunk. zerofree finds unused blocks with non-zero content in ext2, ext3 and ext4 filesystems and fills them with zeros. The volume can’ be mounted which makes the process of running it a bit convoluted. fstrim…

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KVM/QEMU: Reduce the size of your VM files

11th November 201910th November 2019 DavidKVM, VirtualisationLeave a Comment on KVM/QEMU: Reduce the size of your VM files

When virt-manager creates new images by default they will take the full size assigned to the virtual storage on the VM. If your host system is using a filesystem with built-in compression like ZFS or BTRFS it won’t affect the amount of free space left on the host. But if…

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