[Libguestfs] VMware and multiple vmdk files

With VMWare (server), you can pre-allocate your image in several vmdk files. But I have not bee able to mount that in guestfs. On file (e.g. guest.vmdk) is a text file pointing to all the other files (e.g. guest-f001.vmdk, guest-f002.vmdk,...). I tried the following scenarios without success: 1- just adding the base vmdk: add_drive guest.vmdk 2- adding all the files: add_drive guest-f001.vmdk add_drive guest-f002.vmdk ... It works if I merge all the files with vmware-vdiskmanager (something like: vmware-vdiskmanager -r guest.vmdk -t 0 guest-new.vmdk) Can I use guestfs without merging all the files in one image? Thanks, Thierry