EDD (https://en.wikipedia.org/wiki/Enhanced_Disk_Drive) is a BIOS INT 13h subcall for communicating the extended size of the boot disk over 8GB to the OS. Since libguestfs doesn't use a boot disk, and the appliance disk is limited to 4GB, and we use virtio-scsi, this is all useless. EDD is also broken currently on RHEL 7.3, see: https://bugzilla.redhat.com/show_bug.cgi?id=1404287 Also the EDD probing takes significant extra time (about 80ms on my laptop), and using edd=off reduces this time although doesn't entirely eliminate it. --- src/launch.c | 1 + 1 file changed, 1 insertion(+) diff --git a/src/launch.c b/src/launch.c index 78bf46d..46d7ab9 100644 --- a/src/launch.c +++ b/src/launch.c @@ -363,6 +363,7 @@ guestfs_int_appliance_command_line (guestfs_h *g, const char *appliance_dev, */ " efi-rtc=noprobe" #endif + " edd=off" /* RHBZ#1404287 */ " udevtimeout=6000"/* for slow systems (RHBZ#480319, RHBZ#1096579) */ " udev.event-timeout=6000" /* for newer udevd */ " no_timer_check" /* fix for RHBZ#502058 */ -- 2.10.2