[ntp:questions] R: Re: debugging strange ntp in virtual environment
Riccardo Castellani
ric.castellani at alice.it
Thu Sep 19 05:50:23 UTC 2013
>> This NTP server is a virtual machine (by P2V) but few months ago it was >
working fine.
>Time control on a virtual machine is in general terrible. You
should be
>having the underlying OS running ntp and having your virtual OS
getting
>the time from that underlying OS.
So ntpd service, which gives time
to clients, should be on physical machine ?
I ask myself if ntpd sets hardware
clock too and in virtual environment if it changes hardware clock of ESX host.
>Remember that virtual servers have little control over the hardware, and
>get
time at the whim of the underlying OS. Thus their system clocks need
>not be
running at all regularly and they could have drift rates that are
>way outside
of ntpd's range (500PPM) in which case ntpd will just give
>up.
how can I test
my drift rate of virtual machine ?
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