Re: VMware and mirror/multimaster

[Howard Chu <hyc@symas.com>]

Martin Simovic wrote:
> yes, there are issues with a clock in vmware virtual hosts. ntpd is not
> a solution, the right way is to run ntpd on physical machine and set up
> virtual machines to sync clock with the physical one (using vmware
> tools)

Even that is insufficient; the clock synchronization is neither continuous nor 
deterministic so there are long periods of time where the virtual clocks drift 
before they're corrected by the next sync.

> M.
>
> On Tue, 2008-07-29 at 18:21 -0700, Howard Chu wrote:
> > Dave Horsfall wrote:
> > > Has anyone tried mirroring or multimaster under VMware i.e. are the
> > > virtual clocks stable enough?  We're starting to use VMware to cut down on
> > > the number of physical hosts, but I'd like to use the latest 2.4 features
> > > as well.
> > I don't have any long-term experience with that setup, just use VMware for
> > short-duration tests. My suspicion is that the clock stability isn't very
> > good, and ntpd can't correct for it...

--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
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