| Author | Messages | |
bartvdw
Posts:20
 | | 06/21/2010 10:38 AM |
| Gents,
We're having a discussion at work ongoing regarding time synchronization.
For Windows there are 2 groups: sync PDC-E with external NTP source and
configure it as authorative source internal; or use Meinberg NTP software.
What do you guys prefer/use for accurate time synchronization?
Thanks in advance
-Bart
| | | |
| RobSilver
Posts:0
| | 06/21/2010 10:48 AM |
| Hi Bart
There are many different vendors for time synchronization, both HW and SW. Naturally, the lower the Stratum, the better the results.
How accurate do the clocks need to be? If you require less than 3 seconds, Microsoft will not support this and you need to look at for a Stratum 1 HW clock. However, this is very rare unless you are working on the Stock Market or another highly sensitive time industry.
I think the following may be of benefit to you and reflects how to configure time in the forest in a step-by-step manner including many different vendors (SW and HW) to support this:
http://robsilver.org/ad/demystifying-time-in-a-forest/
Regards,
Rob
From: activedir-owner@mail.activedir.org [mailto:activedir-owner@mail.activedir.org] On Behalf Of Bart Van den Wyngaert
Sent: 21 June 2010 10:34 AM
To: activedir@activedir.org
Subject: [ActiveDir] Time synchronization
Gents,
We're having a discussion at work ongoing regarding time synchronization.
For Windows there are 2 groups: sync PDC-E with external NTP source and configure it as authorative source internal; or use Meinberg NTP software.
What do you guys prefer/use for accurate time synchronization?
Thanks in advance
-Bart
| | | |
| bartvdw
Posts:20
| | 06/21/2010 12:34 PM |
| Hi Rob,
Nice wrap up! However this doesn't really bring in new arguments in the
discussion to use legacy configuration (as you describe: configure PDC-E as
authorative time source and so on) vs. NTP software like Meinberg. I'm
looking for arguments in that discussion, both ways.
Additionally if using tools like Meinberg, do you sync with multiple sources
or a single one? (ex. different sources from x.yy.pool.ntp.org)
Thanks
-Bart
On Mon, Jun 21, 2010 at 11:46 AM, [Infraspec] Rob Silver
<rob@infraspec.net>wrote:
> *Hi Bart*
>
> * *
>
> There are many different vendors for time synchronization, both HW and SW.
> Naturally, the lower the Stratum, the better the results.
>
>
>
> How accurate do the clocks need to be? If you require less than 3 seconds,
> Microsoft will not support this and you need to look at for a Stratum 1 HW
> clock. However, this is very rare unless you are working on the Stock
> Market or another highly sensitive time industry.
>
>
>
> I think the following may be of benefit to you and reflects how to
> configure time in the forest in a step-by-step manner including many
> different vendors (SW and HW) to support this:
>
>
>
> http://robsilver.org/ad/demystifying-time-in-a-forest/
>
>
>
> *Regards, *
>
> * *
>
> *Rob*
>
>
>
> *From:* activedir-owner@mail.activedir.org [mailto:
> activedir-owner@mail.activedir.org] *On Behalf Of *Bart Van den Wyngaert
> *Sent:* 21 June 2010 10:34 AM
> *To:* activedir@activedir.org
> *Subject:* [ActiveDir] Time synchronization
>
>
>
> Gents,
>
> We're having a discussion at work ongoing regarding time synchronization.
> For Windows there are 2 groups: sync PDC-E with external NTP source and
> configure it as authorative source internal; or use Meinberg NTP software.
>
> What do you guys prefer/use for accurate time synchronization?
>
> Thanks in advance
> -Bart
>
| | | |
| cmuncy
Posts:13
| | 06/21/2010 2:05 PM |
| I sync my dc with time.microsoft.com for at least the past 5 years and have
never had an issue. Meinberg's software NTP will perform the same function
so 6 of 1, half dozen of the other.
Are you needing an ultraprecise time standard? or just discussing the 2
options.
Chris
On Mon, Jun 21, 2010 at 6:32 AM, Bart Van den Wyngaert <
bartvdw.lists@gmail.com> wrote:
> Hi Rob,
>
> Nice wrap up! However this doesn't really bring in new arguments in the
> discussion to use legacy configuration (as you describe: configure PDC-E as
> authorative time source and so on) vs. NTP software like Meinberg. I'm
> looking for arguments in that discussion, both ways.
>
> Additionally if using tools like Meinberg, do you sync with multiple
> sources or a single one? (ex. different sources from x.yy.pool.ntp.org)
>
> Thanks
> -Bart
>
>
> On Mon, Jun 21, 2010 at 11:46 AM, [Infraspec] Rob Silver <
> rob@infraspec.net> wrote:
>
>> *Hi Bart*
>>
>> * *
>>
>> There are many different vendors for time synchronization, both HW and SW.
>> Naturally, the lower the Stratum, the better the results.
>>
>>
>>
>> How accurate do the clocks need to be? If you require less than 3
>> seconds, Microsoft will not support this and you need to look at for a
>> Stratum 1 HW clock. However, this is very rare unless you are working on
>> the Stock Market or another highly sensitive time industry.
>>
>>
>>
>> I think the following may be of benefit to you and reflects how to
>> configure time in the forest in a step-by-step manner including many
>> different vendors (SW and HW) to support this:
>>
>>
>>
>> http://robsilver.org/ad/demystifying-time-in-a-forest/
>>
>>
>>
>> *Regards, *
>>
>> * *
>>
>> *Rob*
>>
>>
>>
>> *From:* activedir-owner@mail.activedir.org [mailto:
>> activedir-owner@mail.activedir.org] *On Behalf Of *Bart Van den Wyngaert
>> *Sent:* 21 June 2010 10:34 AM
>> *To:* activedir@activedir.org
>> *Subject:* [ActiveDir] Time synchronization
>>
>>
>>
>> Gents,
>>
>> We're having a discussion at work ongoing regarding time synchronization.
>> For Windows there are 2 groups: sync PDC-E with external NTP source and
>> configure it as authorative source internal; or use Meinberg NTP software.
>>
>> What do you guys prefer/use for accurate time synchronization?
>>
>> Thanks in advance
>> -Bart
>>
>
>
| | | |
| bartvdw
Posts:20
| | 06/21/2010 4:00 PM |
| Discussing the 2 options and choose a prefer method of working.
Environments: no particular time precise environments, however it's nice to
have an accurate time sync.
Also other components (ex. ESX) should be linked ofcourse.
That's why I'm asking the opinion here, as some of you manage quiet large
infra's and that could be interesting material to take into account!
Cheers
-Bart
On Mon, Jun 21, 2010 at 3:03 PM, Chris <cmuncy@gmail.com> wrote:
> I sync my dc with time.microsoft.com for at least the past 5 years and
> have never had an issue. Meinberg's software NTP will perform the same
> function so 6 of 1, half dozen of the other.
>
> Are you needing an ultraprecise time standard? or just discussing the 2
> options.
>
> Chris
>
>
>
> On Mon, Jun 21, 2010 at 6:32 AM, Bart Van den Wyngaert <
> bartvdw.lists@gmail.com> wrote:
>
>> Hi Rob,
>>
>> Nice wrap up! However this doesn't really bring in new arguments in the
>> discussion to use legacy configuration (as you describe: configure PDC-E as
>> authorative time source and so on) vs. NTP software like Meinberg. I'm
>> looking for arguments in that discussion, both ways.
>>
>> Additionally if using tools like Meinberg, do you sync with multiple
>> sources or a single one? (ex. different sources from x.yy.pool.ntp.org)
>>
>> Thanks
>> -Bart
>>
>>
>> On Mon, Jun 21, 2010 at 11:46 AM, [Infraspec] Rob Silver <
>> rob@infraspec.net> wrote:
>>
>>> *Hi Bart*
>>>
>>> * *
>>>
>>> There are many different vendors for time synchronization, both HW and
>>> SW. Naturally, the lower the Stratum, the better the results.
>>>
>>>
>>>
>>> How accurate do the clocks need to be? If you require less than 3
>>> seconds, Microsoft will not support this and you need to look at for a
>>> Stratum 1 HW clock. However, this is very rare unless you are working on
>>> the Stock Market or another highly sensitive time industry.
>>>
>>>
>>>
>>> I think the following may be of benefit to you and reflects how to
>>> configure time in the forest in a step-by-step manner including many
>>> different vendors (SW and HW) to support this:
>>>
>>>
>>>
>>> http://robsilver.org/ad/demystifying-time-in-a-forest/
>>>
>>>
>>>
>>> *Regards, *
>>>
>>> * *
>>>
>>> *Rob*
>>>
>>>
>>>
>>> *From:* activedir-owner@mail.activedir.org [mailto:
>>> activedir-owner@mail.activedir.org] *On Behalf Of *Bart Van den Wyngaert
>>> *Sent:* 21 June 2010 10:34 AM
>>> *To:* activedir@activedir.org
>>> *Subject:* [ActiveDir] Time synchronization
>>>
>>>
>>>
>>> Gents,
>>>
>>> We're having a discussion at work ongoing regarding time synchronization.
>>> For Windows there are 2 groups: sync PDC-E with external NTP source and
>>> configure it as authorative source internal; or use Meinberg NTP software.
>>>
>>> What do you guys prefer/use for accurate time synchronization?
>>>
>>> Thanks in advance
>>> -Bart
>>>
>>
>>
>
| | | |
| febrero
Posts:9
| | 06/21/2010 8:34 PM |
| Root PDC-E with trusted NTP, all the rest of DCs in the forest using NT5DS ( DOMHIER ).
________________________________
From: activedir-owner@mail.activedir.org [activedir-owner@mail.activedir.org] on behalf of Bart Van den Wyngaert [bartvdw.lists@gmail.com]
Sent: Monday, June 21, 2010 4:36 AM
To: activedir@activedir.org
Subject: [ActiveDir] Time synchronization
Gents,
We're having a discussion at work ongoing regarding time synchronization.
For Windows there are 2 groups: sync PDC-E with external NTP source and configure it as authorative source internal; or use Meinberg NTP software.
What do you guys prefer/use for accurate time synchronization?
Thanks in advance
-Bart
| | | |
| robertsingers
Posts:571
| | 06/22/2010 11:04 PM |
| If you have a large environment then GPS time sources are probably within your budget. Just google it, you'll find plenty out there. Generally the most difficult bit is cabling the aerial.
From: activedir-owner@mail.activedir.org [mailto:activedir-owner@mail.activedir.org] On Behalf Of Bart Van den Wyngaert
Sent: Tuesday, 22 June 2010 3:00 a.m.
To: activedir@mail.activedir.org
Subject: Re: [ActiveDir] Time synchronization
Discussing the 2 options and choose a prefer method of working.
Environments: no particular time precise environments, however it's nice to have an accurate time sync.
Also other components (ex. ESX) should be linked ofcourse.
That's why I'm asking the opinion here, as some of you manage quiet large infra's and that could be interesting material to take into account!
Cheers
-Bart
On Mon, Jun 21, 2010 at 3:03 PM, Chris <cmuncy@gmail.com<mailto:cmuncy@gmail.com>> wrote:
I sync my dc with time.microsoft.com<http://time.microsoft.com> for at least the past 5 years and have never had an issue. Meinberg's software NTP will perform the same function so 6 of 1, half dozen of the other.
Are you needing an ultraprecise time standard? or just discussing the 2 options.
Chris
On Mon, Jun 21, 2010 at 6:32 AM, Bart Van den Wyngaert <bartvdw.lists@gmail.com<mailto:bartvdw.lists@gmail.com>> wrote:
Hi Rob,
Nice wrap up! However this doesn't really bring in new arguments in the discussion to use legacy configuration (as you describe: configure PDC-E as authorative time source and so on) vs. NTP software like Meinberg. I'm looking for arguments in that discussion, both ways.
Additionally if using tools like Meinberg, do you sync with multiple sources or a single one? (ex. different sources from x.yy.pool.ntp.org<http://x.yy.pool.ntp.org>
Thanks
-Bart
On Mon, Jun 21, 2010 at 11:46 AM, [Infraspec] Rob Silver <rob@infraspec.net<mailto:rob@infraspec.net>> wrote:
Hi Bart
There are many different vendors for time synchronization, both HW and SW. Naturally, the lower the Stratum, the better the results.
How accurate do the clocks need to be? If you require less than 3 seconds, Microsoft will not support this and you need to look at for a Stratum 1 HW clock. However, this is very rare unless you are working on the Stock Market or another highly sensitive time industry.
I think the following may be of benefit to you and reflects how to configure time in the forest in a step-by-step manner including many different vendors (SW and HW) to support this:
http://robsilver.org/ad/demystifying-time-in-a-forest/
Regards,
Rob
From: activedir-owner@mail.activedir.org<mailto:activedir-owner@mail.activedir.org> [mailto:activedir-owner@mail.activedir.org<mailto:activedir-owner@mail.activedir.org>] On Behalf Of Bart Van den Wyngaert
Sent: 21 June 2010 10:34 AM
To: activedir@activedir.org<mailto:activedir@activedir.org>
Subject: [ActiveDir] Time synchronization
Gents,
We're having a discussion at work ongoing regarding time synchronization.
For Windows there are 2 groups: sync PDC-E with external NTP source and configure it as authorative source internal; or use Meinberg NTP software.
What do you guys prefer/use for accurate time synchronization?
Thanks in advance
-Bart
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