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Fix missing QCOW2 overhead on LVM cluster LVs - #3537
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On lvmcluster, block volumes are stored as a qcow2 image written directly onto the backing logical volume. The LV was sized to the qcow2 virtual size, leaving no room for qcow2 metadata. A fully-allocated image (e.g. after a full backup restore) then overflows the LV, causing QEMU to report ENOSPC. Size the backing LV to the qcow2 fully-allocated size while keeping the qcow2 virtual size at the requested size. Signed-off-by: Stéphane Graber <stgraber@stgraber.org>
Retroactively grow the backing logical volume of existing lvmcluster qcow2 block volumes to include the qcow2 metadata overhead, so a fully-allocated image no longer overflows the volume. Signed-off-by: Stéphane Graber <stgraber@stgraber.org>
presztak
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Jun 25, 2026
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