Piranha clusters and VMware clock synch -- SOLUTION

[Kit Gerrits]

Hello all,

A few notes w.r.t. section 48.4 of the LVS HOWTO (VMware problems with
NTP/time)
It -IS- possible to keep several hosts in sync time-wise in VMware, even on
a simple laptop.

I am currently running an LVS cluster and 2 webservers on my laptop with
VMWare Server 1.0.7 and 1GB RAM.
There have been no spontaneous cluster failovers (yet) today.


For GSX / VMware Server:
Pass the following options to the kernel via grub.conf:
  clock=pit nosmp noapic nolapic

For RHEL5/CentOS5, you should use the following:
  clocksource=pit nosmp noapic nolapic

Because this will disable all of Linux' intelligent clock tricks, you'll
need to run NTPd to keep your clock in sync.
More info at:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1420


For ESX servers,  the solution is 'simpler':
You need to lower the minimum time between clok requests:
  Configuration --> Software --> Advanced Settings --> Misc -->
Misc.TimerMinHardPeriod
  Lower this value (it is in microseconds)
More info at:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2219
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