Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread unruh
On 2013-09-19, Riccardo Castellani ric.castell...@alice.it wrote: I converted physical machine to virtual one, where there is NTPd service. My ESX host is running several guest OS included this NTP server. Can it be this one the problem ? Virtualization ? I'd like to know if ntpd adjusts

Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread David Woolley
On 19/09/13 06:41, Riccardo Castellani wrote: one the problem ? Virtualization ? I'd like to know if ntpd adjusts only OS time or it adjust hardware clock too. ntpd only adjusts the software clock, however, the guest OS may well try to update the hardware clock. Normal VM hosts will

Re: [ntp:questions] which servers should be peers?

2013-09-19 Thread David Taylor
On 18/09/2013 23:09, unruh wrote: [] Well, there is a problem. You said that you had seen all of your S1 servers suddenly declare that the time was 1982 and presumably that the times were very close (to less than a second). They would then form a group of servers which could well outvote the

[ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread Riccardo Castellani
David Woolley wrote: The basic problems with running ntpd on VMs are that simulated real time can run at variable rates, compared with true real time, and there can be large scheduling delays, which compromise the accuracy of offset measurement. What means simulated real time can run at

[ntp:questions] tnp server on linux guest machine (vmware)

2013-09-19 Thread Riccardo Castellani
Do you think it's good idea install time server into guest Linux machine ? I read something time and I think to use physical machine, it's right ? ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions

Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread Rob
Riccardo Castellani ric.castell...@alice.it wrote: I converted physical machine to virtual one, where there is NTPd service. My ESX host is running several guest OS included this NTP server. Can it be this one the problem ? Virtualization ? I'd like to know if ntpd adjusts only OS time or

Re: [ntp:questions] which servers should be peers?

2013-09-19 Thread Maria Iano
Well, there is a problem. You said that you had seen all of your S1 servers suddenly declare that the time was 1982 and presumably that the times were very close (to less than a second). They would then form a group of servers which could well outvote the S2s that are delivering the

Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread Horvath Bob-BHORVAT1
-Original Message- From: questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org [mailto:questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org] On Behalf Of Rob Sent: Thursday, September 19, 2013 4:27 AM To: questions@lists.ntp.org Subject: Re:

Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread Rob
Horvath Bob-BHORVAT1 bob.horv...@motorolasolutions.com wrote: Please read the knowledge base article on the VMware site for a full explanation of how it works and what you can configure. I think the confusing aspect to many is that the recommendations from VMware are to run NTP on the guests

Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread Horvath Bob-BHORVAT1
-Original Message- From: questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org [mailto:questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org] On Behalf Of Rob Sent: Thursday, September 19, 2013 11:20 AM To: questions@lists.ntp.org Subject: Re:

Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread Rob
Horvath Bob-BHORVAT1 bob.horv...@motorolasolutions.com wrote: -Original Message- From: questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org [mailto:questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org] On Behalf Of Rob Sent: Thursday, September 19, 2013

Re: [ntp:questions] which servers should be peers?

2013-09-19 Thread Steve Kostecke
On 2013-09-19, Maria Iano ma...@iano.org wrote: Thank you all for your responses, this has been very helpful. I have an additional question now, which is once I have this all set up with the S1 and S2 servers, should I then point the clients to only the S2 servers? Currently they point to our

Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread Rob
unruh un...@invalid.ca wrote: On 2013-09-19, Horvath Bob-BHORVAT1 bob.horv...@motorolasolutions.com wrote: -Original Message- From: questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org [mailto:questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org] On

Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread unruh
On 2013-09-19, Horvath Bob-BHORVAT1 bob.horv...@motorolasolutions.com wrote: -Original Message- From: questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org [mailto:questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org] On Behalf Of Rob Sent: Thursday,

Re: [ntp:questions] which servers should be peers?

2013-09-19 Thread Maria Iano
Thank you all for your time and expertise. I feel confident about the design now. This list has been really helpful. Maria ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions

Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread David Woolley
What means simulated real time can run at variable rates ?! This is explained in one of the early VMWare white papers on timing (at the time they were recommending using VMWare Tools to control the guest time and synchronising the host. There seem to have been changes since, but I

Re: [ntp:questions] R: Re: debugging strange ntp in virtual environment

2013-09-19 Thread unruh
On 2013-09-19, Rob nom...@example.com wrote: unruh un...@invalid.ca wrote: On 2013-09-19, Horvath Bob-BHORVAT1 bob.horv...@motorolasolutions.com wrote: -Original Message- From: questions-bounces+bob.horvath=motorolasolutions@lists.ntp.org

Re: [ntp:questions] R: Re: debugging strange ntpin virtual environment

2013-09-19 Thread Riccardo Castellani
unruh un...@invalid.ca ha scritto nel messaggio news:xzI_t.106385$_q4.85...@fx01.iad... vers is the same. It seems to now, and then that machine becomes loaded, with one of the other virtual machine taking up loads of time, and suddenly your time has gone to hell. This is how you want a