It does not need configuring and speeds up the process of requesting extents if the client asks for them one by one (like qemu-img). Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com&gt; --- v2v/input_libvirt_vddk.ml | 3 +++ 1 file changed, 3 insertions(+) diff --git a/v2v/input_libvirt_vddk.ml b/v2v/input_libvirt_vddk.ml index a8e4fd5ac78e..cc63f77ce825 100644 --- a/v2v/input_libvirt_vddk.ml +++ b/v2v/input_libvirt_vddk.ml @@ -284,6 +284,9 @@ object (self) add_arg "--selinux-label"; add_arg "system_u:object_r:svirt_socket_t:s0" ); + if shell_command "nbdkit --filter cacheextents memory 1M --run true 2>/dev/null" = 0 + then add_arg "--filter=cacheextents"; + (* Name of the plugin. Everything following is a plugin parameter. *) add_arg "vddk";