Red Hat Bugzilla – Bug 956741
When RHEL VMs are powered off/on time is off by as much as 3 hrs when system comes back up
Last modified: 2014-05-29 04:01:34 EDT
Description of problem: When RHEL VMs are powered off/on time is off by as much as 3 hrs when system comes back up Version-Release number of selected component (if applicable): 3.1 How reproducible: haven't managed to reproduce it locally Steps to Reproduce: 1. Stop VM 2. Restart VM 3. Check time in guest Actual results: Time is off by exactly 1 or 3 hours, depending on VM Expected results: Time in VM should be correct
I also did not manage to reproduce the issue. Could you please submit as well qemu and libvirt logs from the hypervisor to make post-mortem analisys? It is needed to review qemu startup command line. I suspect, the issue can be caused not by RHEV at all, but by the guest.
The fix was proposed.
we need our side then, libvirt is just updating doc
we need a solution for upgrade as well. At least a process how to reset it to correct value. After discussion with Andy we rather should not allow Linux OSes to configure TZ as they all assume UTC by default anyway and there's no point in setting anything else as a HW clock base. And for Windows we should perhaps re-use the TZ setting from Initial Run tab to be actually applied all the time (or use Guest Agent for monitoring the current one in the guest) and supply it for every power up operation instead of tracking and storing rtc updates. For time drift difference it may also be preferable to actually correct the time instead of carrying over the wrong drift.
Note for a complete fix bug 1062615 would need to get in as well. Without it the TZ is not changeable
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2014-0384.html