NTPD works perfectly on VMs Regards, Miguel. El mar, 31-05-2011 a las 09:36 +0200, Werf, C.G. van der (Carel) escribió: > In my opinion you should NEVER use NTPD in a virtual machine….. > > Check out how NTPD works… it tries to adjust “software cycles”to > “hardware cycles”. > > “Hardware cycles” are a bit undefined in a virtual machine. > > > > Best way, in my opinion, is: > > - Adjust clock of host using NTPD. > > - Adjust clock of virtual machine to clock of host using the > appropriate Vritual tools. > (Vmware Tools etc). > > > > Regards, > > Carel > > > > From: [log in to unmask] > [mailto:[log in to unmask]] On Behalf Of > Zack Yovel > Sent: maandag 30 mei 2011 20:57 > To: Alain Péan > Cc: Orion Poplawski; Jaroslaw Polok; > [log in to unmask] > Subject: Re: clock drift under Hyper-V > > > > > > > 2011/5/30 Alain Péan <[log in to unmask]> > > Le 27/05/2011 18:17, Orion Poplawski a écrit : > > > > On 05/27/2011 12:14 AM, Jaroslaw Polok wrote: > > Hello > > On 05/26/2011 10:28 PM, Orion Poplawski wrote: > > On 05/26/2011 07:29 AM, Zack Yovel wrote: > > > 1. Hyper-V does not support RHEL. The only linux distro it > supports is SUSE. > > > I'm running a couple of CentOS 5.6 instances under Hyper-V. > Horrible clock drift > issues, but otherwise okay. > > > You may want to add: > > divider=10 clocksource=acpi_pm > > to kernel arguments in /etc/grub.conf > > to correct the clock drift problem. > > > Doesn't help me. Thanks though. I would have thought that > the Hyper-V timesync integration driver would help too, but > not for me. > > > > > > Hyper-V does support RHEL, at least 5 (not yet 6 perhaps). See : > http://www.redhat.com/promo/svvp/ > > But if you have clock drift, why don't you setup an NTP server inside > your VM ? > > Alain > > -- > ========================================================== > Alain Péan - LPP/CNRS > Administrateur Système/Réseau > Laboratoire de Physique des Plasmas - UMR 7648 > Observatoire de Saint-Maur > 4, av de Neptune, Bat. A > 94100 Saint-Maur des Fossés > Tel : 01-45-11-42-39 - Fax : 01-48-89-44-33 > ========================================================== > > > As I noted in a different mail, I was wrong and Hyper-V does support > RHEL, up to 5.5 (not 5.6, at least according to Microsoft.. > http://www.microsoft.com/windowsserver2008/en/us/hyperv-supported-guest-os.aspx perhaps a small difference in 5.6 could cause the problem?). > >