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?). 
> 
>