Hi all, A new problem for me. Since I was able to run guests with Xen, I''m stuck with a time synchronization error each time system boot and stop. each time theses events occur, the VM seem to stop running (nothing is displayed on screen) and after 5-10 minutes, normal `init` go on and the system work fine. After some search, I saw that''s the problem comes from `hwclock`. When i run it manually it display this error : hwclock from util-linux-ng 2.13 hwclock: Open of /dev/rtc failed, errno=19: No such device. <<<<< Using direct I/O instructions to ISA clock. Last drift adjustment done at 1423924190 seconds after 1969 Last calibration done at 1423924190 seconds after 1969 Hardware clock is on UTC time Assuming hardware clock is kept in local time. Waiting for clock tick... I delete & recreate /dev/rtc but it does not solve the problem. Maybe this problem was discussed before on this list but i was unable to find any search tools on fedora/redhat website and manually search against the subject for the 6 last month did not return me any good answer. So, maybe a quick solution about this veeeerrrryyyy long boot time exist. Thanks for your help. -- Guillaume