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cp -z .... For Linux, XFS w/ kernel 4.8 or later and BTRFS do support reflinks.cp --reflink source destworks for OpenZFS inLinux 6.6.32(TrueNAS SCALEDragonfish-24.04.2). It may work in earlier releases too.cp --reflinkon Ubuntu 24.04 LTS and some other current linux distros, you may need to performecho 1 | sudo tee /sys/module/zfs/parameters/zfs_bclone_enabled, first. To enable this feature across reboots, putoptions zfs zfs_bclone_enabled=1into/etc/modprobe.d/zfs.conf. Further verify, that block-cloning is enabled on the particular ZFS pool, that you are using:zpool get feature@block_cloning. If not, use:zpool set feature@block_cloning=enabled POOLto activate it. Note, that block-cloning is still considered somewhat experimental.