| Author | Messages | |
Parzival
Posts:107
 | | 07/14/2010 2:18 PM |
| Hi everyone,
My customer wants to run all domain controller virtual on a Vmware platform. The platform consists of multiple vSphere hosts in a cluster. For time sync, they already have for all their VM's configured to not follow domain hierarchy but sync with the vmware hosts. They wish to do the same with the domain controllers. The Vmware host's get their time information from an external source. They only want to be sure that the time will not change due to incorrect timezone configuration on the Vmware hosts during vmotion.
Therefore they want to set the max en min phase correction for domain controllers to 59 minutes (less than 1 timezone). However, what will happen during summer/wintertime changes? Is the maxPhase en MinPhase based on the UTC time or time offset? if it was UTC only, time would change normally as it is not the time that changes, only the UTC offset if it calculates based on the time+timezone.. I suspect it will not be changed..
_R
| | | |
| bdesmond
Posts:977
| | 07/14/2010 2:36 PM |
| What your customer wants to do is a bad idea and is documented as such: http://technet.microsoft.com/en-us/library/dd348449(WS.10).aspx. Use the in-box time sync mechanism.
Thanks,
Brian Desmond
brian@briandesmond.com
c - 312.731.3132
From: activedir-owner@mail.activedir.org [mailto:activedir-owner@mail.activedir.org] On Behalf Of Roelf Zomerman
Sent: Wednesday, July 14, 2010 8:18 AM
To: activedir@mail.activedir.org
Subject: [ActiveDir] MaxPhase en MinPhase correction & Virtualization
Hi everyone,
My customer wants to run all domain controller virtual on a Vmware platform. The platform consists of multiple vSphere hosts in a cluster. For time sync, they already have for all their VM's configured to not follow domain hierarchy but sync with the vmware hosts. They wish to do the same with the domain controllers. The Vmware host's get their time information from an external source. They only want to be sure that the time will not change due to incorrect timezone configuration on the Vmware hosts during vmotion.
Therefore they want to set the max en min phase correction for domain controllers to 59 minutes (less than 1 timezone). However, what will happen during summer/wintertime changes? Is the maxPhase en MinPhase based on the UTC time or time offset? if it was UTC only, time would change normally as it is not the time that changes, only the UTC offset if it calculates based on the time+timezone.. I suspect it will not be changed..
_R
| | | |
| skradel
Posts:177
| | 07/14/2010 3:09 PM |
| Also, I would note that a change in the local observed time
(timezones, daylight savings, etc.) is not a change in the system /
NTP time at all.
--Steve
On Wed, Jul 14, 2010 at 9:33 AM, Brian Desmond <brian@briandesmond.com> wrote:
> What your customer wants to do is a bad idea and is documented as such:
> http://technet.microsoft.com/en-us/library/dd348449(WS.10).aspx. Use the
> in-box time sync mechanism.
>
> Thanks,
>
> Brian Desmond
>
> brian@briandesmond.com
>
> c – 312.731.3132
>
>
>
> From: activedir-owner@mail.activedir.org
> [mailto:activedir-owner@mail.activedir.org] On Behalf Of Roelf Zomerman
> Sent: Wednesday, July 14, 2010 8:18 AM
>
> To: activedir@mail.activedir.org
> Subject: [ActiveDir] MaxPhase en MinPhase correction & Virtualization
>
>
>
> Hi everyone,
>
>
>
> My customer wants to run all domain controller virtual on a Vmware platform.
> The platform consists of multiple vSphere hosts in a cluster. For time sync,
> they already have for all their VM’s configured to not follow domain
> hierarchy but sync with the vmware hosts. They wish to do the same with the
> domain controllers. The Vmware host’s get their time information from an
> external source. They only want to be sure that the time will not change due
> to incorrect timezone configuration on the Vmware hosts during vmotion.
>
>
>
> Therefore they want to set the max en min phase correction for domain
> controllers to 59 minutes (less than 1 timezone). However, what will happen
> during summer/wintertime changes? Is the maxPhase en MinPhase based on the
> UTC time or time offset? if it was UTC only, time would change normally as
> it is not the time that changes, only the UTC offset if it calculates based
> on the time+timezone.. I suspect it will not be changed..
>
>
>
>
>
> _R
| | | |
| bdesmond
Posts:977
| | 07/14/2010 3:11 PM |
| Agreed and also while I'm thinking about it, this isn't going to be affected at all by those reg keys (I think that's what you're saying too Steve).
Thanks,
Brian Desmond
brian@briandesmond.com
c - 312.731.3132
-----Original Message-----
From: activedir-owner@mail.activedir.org [mailto:activedir-owner@mail.activedir.org] On Behalf Of Steve Kradel
Sent: Wednesday, July 14, 2010 9:08 AM
To: activedir@mail.activedir.org
Subject: Re: [ActiveDir] MaxPhase en MinPhase correction & Virtualization
Also, I would note that a change in the local observed time (timezones, daylight savings, etc.) is not a change in the system / NTP time at all.
--Steve
On Wed, Jul 14, 2010 at 9:33 AM, Brian Desmond <brian@briandesmond.com> wrote:
> What your customer wants to do is a bad idea and is documented as such:
> http://technet.microsoft.com/en-us/library/dd348449(WS.10).aspx. Use
> the in-box time sync mechanism.
>
> Thanks,
>
> Brian Desmond
>
> brian@briandesmond.com
>
> c - 312.731.3132
>
>
>
> From: activedir-owner@mail.activedir.org
> [mailto:activedir-owner@mail.activedir.org] On Behalf Of Roelf
> Zomerman
> Sent: Wednesday, July 14, 2010 8:18 AM
>
> To: activedir@mail.activedir.org
> Subject: [ActiveDir] MaxPhase en MinPhase correction & Virtualization
>
>
>
> Hi everyone,
>
>
>
> My customer wants to run all domain controller virtual on a Vmware platform.
> The platform consists of multiple vSphere hosts in a cluster. For time
> sync, they already have for all their VM's configured to not follow
> domain hierarchy but sync with the vmware hosts. They wish to do the
> same with the domain controllers. The Vmware host's get their time
> information from an external source. They only want to be sure that
> the time will not change due to incorrect timezone configuration on the Vmware hosts during vmotion.
>
>
>
> Therefore they want to set the max en min phase correction for domain
> controllers to 59 minutes (less than 1 timezone). However, what will
> happen during summer/wintertime changes? Is the maxPhase en MinPhase
> based on the UTC time or time offset? if it was UTC only, time would
> change normally as it is not the time that changes, only the UTC
> offset if it calculates based on the time+timezone.. I suspect it will not be changed..
>
>
>
>
>
> _R
| | | |
| RobSilver
Posts:0
| | 07/14/2010 8:15 PM |
| Agreed to these sentiments. Additionally, I would always recommend having a single DC on a physical (inexpensive) box if you are serious about DR.
The time is however based on UTC so time zone changes have zero affect on the actual time. I recall working on ships before W32tm which crossed multiple time zones per week which was interesting.
Regards,
Rob Silver<http://robsilver.org/>
Agreed and also while I'm thinking about it, this isn't going to be affected at all by those reg keys (I think that's what you're saying too Steve).
Thanks,
Brian Desmond
brian@briandesmond.com<mailto:brian@briandesmond.com>
c - 312.731.3132
-----Original Message-----
From: activedir-owner@mail.activedir.org [mailto:activedir-owner@mail.activedir.org] On Behalf Of Steve Kradel
Sent: Wednesday, July 14, 2010 9:08 AM
To: activedir@mail.activedir.org
Subject: Re: [ActiveDir] MaxPhase en MinPhase correction & Virtualization
Also, I would note that a change in the local observed time (timezones, daylight savings, etc.) is not a change in the system / NTP time at all.
--Steve
On Wed, Jul 14, 2010 at 9:33 AM, Brian Desmond <brian@briandesmond.com<mailto:brian@briandesmond.com>> wrote:
> What your customer wants to do is a bad idea and is documented as such:
> http://technet.microsoft.com/en-us/library/dd348449(WS.10).aspx. Use
> the in-box time sync mechanism.
>
> Thanks,
>
> Brian Desmond
>
> brian@briandesmond.com<mailto:brian@briandesmond.com>
>
> c - 312.731.3132
>
>
>
> From: activedir-owner@mail.activedir.org
> [mailto:activedir-owner@mail.activedir.org] On Behalf Of Roelf
> Zomerman
> Sent: Wednesday, July 14, 2010 8:18 AM
>
> To: activedir@mail.activedir.org<mailto:activedir@mail.activedir.org>
> Subject: [ActiveDir] MaxPhase en MinPhase correction & Virtualization
>
>
>
> Hi everyone,
>
>
>
> My customer wants to run all domain controller virtual on a Vmware platform.
> The platform consists of multiple vSphere hosts in a cluster. For time
> sync, they already have for all their VM's configured to not follow
> domain hierarchy but sync with the vmware hosts. They wish to do the
> same with the domain controllers. The Vmware host's get their time
> information from an external source. They only want to be sure that
> the time will not change due to incorrect timezone configuration on the Vmware hosts during vmotion.
>
>
>
> Therefore they want to set the max en min phase correction for domain
> controllers to 59 minutes (less than 1 timezone). However, what will
> happen during summer/wintertime changes? Is the maxPhase en MinPhase
> based on the UTC time or time offset? if it was UTC only, time would
> change normally as it is not the time that changes, only the UTC
> offset if it calculates based on the time+timezone.. I suspect it will not be changed..
>
>
>
>
>
> _R
| | | |
| deji
Posts:262
| | 07/18/2010 8:35 AM |
| VMware recommends that you let domain-joined computers respect the domain time heirarchy. VMware does not recommend that you synch to the ESX host IF you are in a domain environment. There may have been contrary suggestions in time past, but that is no longer the case.
Synch your hosts to the same time source you will synch your PDCE to. Then follow the standard AD time synch practice.
Sincerely,
_____
(, / | /) /) /)
/---| (/_ ______ ___// _ // _
) / |_/(__(_) // (_(_)(/_(_(_/(__(/_
(_/ /)
(/
www.akomolafe.name<http://www.akomolafe.name/> - we know IT
-5.75, -3.23
Do you now realize that Today is the Tomorrow you were worried about Yesterday? -anon
________________________________
From: activedir-owner@mail.activedir.org [activedir-owner@mail.activedir.org] on behalf of Roelf Zomerman [roelf.zomerman@avanade.com]
Sent: Wednesday, July 14, 2010 6:17 AM
To: activedir@mail.activedir.org
Subject: [ActiveDir] MaxPhase en MinPhase correction & Virtualization
Hi everyone,
My customer wants to run all domain controller virtual on a Vmware platform. The platform consists of multiple vSphere hosts in a cluster. For time sync, they already have for all their VM’s configured to not follow domain hierarchy but sync with the vmware hosts. They wish to do the same with the domain controllers. The Vmware host’s get their time information from an external source. They only want to be sure that the time will not change due to incorrect timezone configuration on the Vmware hosts during vmotion.
Therefore they want to set the max en min phase correction for domain controllers to 59 minutes (less than 1 timezone). However, what will happen during summer/wintertime changes? Is the maxPhase en MinPhase based on the UTC time or time offset? if it was UTC only, time would change normally as it is not the time that changes, only the UTC offset if it calculates based on the time+timezone.. I suspect it will not be changed..
_R
________________________________
Akomolafe, Deji
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