| Author | Messages | |
TG
Posts:253
 | | 06/05/2009 5:44 PM |
| Return Receipt
Your [ActiveDir] [OT]Alternate time service
document:
was Tony.Gordon@hewitt.com
received
by:
at: 06/05/2009 11:40:42 AM
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| bdesmond
Posts:813
| | 06/06/2009 12:26 AM |
| Look at what the GPS Clock PCI Card people bundle?
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 Darren Mar-Elia
Sent: Friday, June 05, 2009 11:39 AM
To: activedir@mail.activedir.org
Subject: [ActiveDir] [OT]Alternate time service
All-
MS states that W32time should not be used in scenarios where you need super-tight time tolerances. Is anyone using another time service successfully in these kind of scenarios on Windows and if so, which one?
Thanks,
Darren
****
Darren Mar-Elia
CTO & Founder
SDM Software, Inc.
"The Group Policy Experts"
www.sdmsoftware.com
Spot and report on GPO inconsistencies quickly with GPO Compare http://www.sdmsoftware.com/group_policy_compare
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| michael1
Posts:374
| | 06/07/2009 7:20 PM |
| Well, I guess the major thing to keep in mind is that the Windows OS is not a real-time operating system.
That being said, there are several Windows ports of the NTP reference implementation available:
http://support.ntp.org/bin/view/Main/ExternalTimeRelatedLinks
-----Original Message-----
From: activedir-owner@mail.activedir.org [mailto:activedir-owner@mail.activedir.org] On Behalf Of Tomasz Onyszko
Sent: Friday, June 05, 2009 7:17 PM
To: activedir@mail.activedir.org
Subject: Re: [ActiveDir] [OT]Alternate time service
Darren Mar-Elia wrote:
> All-
> MS states that W32time should not be used in scenarios where you need super-tight time tolerances. Is anyone using another time service successfully in these kind of scenarios on Windows and if so, which one?
I know customers who are using external devices which are synchronized
with atomic clocks. So this is hardware + software solution. Not exactly
answer to your question but somehow related.
--
Tomasz Onyszko
http://www.w2k.pl/ - (PL)
http://blogs.dirteam.com/blogs/tomek/ - (EN)
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| kbatkbslpcom
Posts:144
| | 06/08/2009 2:13 PM |
| We use NTP along with an external time source (connected via serial
port). So our internal time servers (3 of them with external time
gathering devices) are considered "stratum 1" time sources for the rest
of the environment.
We went with serial (way back when - as opposed to a slot based solution
- PCI or other) as virtually every OS & NTP solution has the ability to
communicate with a serial port - and you may want to move the time
sources to an OS other than Windows (so then you have to be concerned
with drivers talking to your PCI card). The external device we use
costs around $1K US each.
We are currently using the Meinberg NTP code - but there are other
sources.
If you do have a need for accurate time - make sure you use physical
hardware to run your OS (i.e. do not run the time software on a machine
that has been virtualized). Also, if you run it on Windows - make sure
you stop/disable the win32time service on the box running NTP (I know
that sounds like a "DUH" - but it happened to us when we rebuilt a box).
-----Original Message-----
From: activedir-owner@mail.activedir.org
[mailto:activedir-owner@mail.activedir.org] On Behalf Of Darren Mar-Elia
Sent: Friday, June 05, 2009 12:39 PM
To: activedir@mail.activedir.org
Subject: [ActiveDir] [OT]Alternate time service
All-
MS states that W32time should not be used in scenarios where you need
super-tight time tolerances. Is anyone using another time service
successfully in these kind of scenarios on Windows and if so, which one?
Thanks,
Darren
****
Darren Mar-Elia
CTO & Founder
SDM Software, Inc.
"The Group Policy Experts"
www.sdmsoftware.com
Spot and report on GPO inconsistencies quickly with GPO Compare
http://www.sdmsoftware.com/group_policy_compare
| | | |
| RandomXs
Posts:1
| | 06/08/2009 7:42 PM |
| Symmetricom has a lot of useful info on their website about microsecond time
stamp accuracy using NTP for clock control and GPS receivers for precise
time.
(I have no connection w/Symmetricom and I don't use any extraordinary
network timing protocols in our environment.)
Regards,
Randy
W. R. "Randy" Benson
W. R. Benson & Associates
Surveying-Mapping-GPS
-----Original Message-----
From: activedir-owner@mail.activedir.org
[mailto:activedir-owner@mail.activedir.org] On Behalf Of Darren Mar-Elia
Sent: Friday, June 05, 2009 9:39 AM
To: activedir@mail.activedir.org
Subject: [ActiveDir] [OT]Alternate time service
All-
MS states that W32time should not be used in scenarios where you need
super-tight time tolerances. Is anyone using another time service
successfully in these kind of scenarios on Windows and if so, which one?
Thanks,
Darren
****
Darren Mar-Elia
CTO & Founder
SDM Software, Inc.
"The Group Policy Experts"
www.sdmsoftware.com
Spot and report on GPO inconsistencies quickly with GPO Compare
http://www.sdmsoftware.com/group_policy_compare
| | | |
| darren
Posts:325
| | 06/08/2009 8:03 PM |
| Thanks Randy and others who responded to this. Lots of good info here.
Darren
-----Original Message-----
From: activedir-owner@mail.activedir.org
[mailto:activedir-owner@mail.activedir.org] On Behalf Of Randy Benson
Sent: Monday, June 08, 2009 11:40 AM
To: activedir@mail.activedir.org
Subject: RE: [ActiveDir] [OT]Alternate time service
Symmetricom has a lot of useful info on their website about microsecond time
stamp accuracy using NTP for clock control and GPS receivers for precise
time.
(I have no connection w/Symmetricom and I don't use any extraordinary
network timing protocols in our environment.)
Regards,
Randy
W. R. "Randy" Benson
W. R. Benson & Associates
Surveying-Mapping-GPS
-----Original Message-----
From: activedir-owner@mail.activedir.org
[mailto:activedir-owner@mail.activedir.org] On Behalf Of Darren Mar-Elia
Sent: Friday, June 05, 2009 9:39 AM
To: activedir@mail.activedir.org
Subject: [ActiveDir] [OT]Alternate time service
All-
MS states that W32time should not be used in scenarios where you need
super-tight time tolerances. Is anyone using another time service
successfully in these kind of scenarios on Windows and if so, which one?
Thanks,
Darren
****
Darren Mar-Elia
CTO & Founder
SDM Software, Inc.
"The Group Policy Experts"
www.sdmsoftware.com
Spot and report on GPO inconsistencies quickly with GPO Compare
http://www.sdmsoftware.com/group_policy_compare
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