Intra-Site replication in Windows 2003

Hi,

Anybody can tell me the default intra-site replication for Windows 2003?. I've being looking on Internet and it's not very clear for me,  I don't know if it's 5 minutes, 15 seconds or 1 hour.

Doing some research and takin advantage of repadmin and replmon, I saw that replication of Configuration and Domain pratitions happens every 15 minutes but it goes to an hour for the Schem partition.

However, for inter-site link, the replication frequency is 15 minutes for the three partitions, as I changed that frequency by using Sites and Servicies.

Tahnk you.
JorgeSimarroVillarAsked:
Who is Participating?
 
Glen KnightConnect With a Mentor Commented:
They are more than likely refering to a replication CHECK.  The servers will attempt to replicate, but if there is nothing to replicate then that's as far as it goes.

Remember that when you make a change to a user, group, computer object etc etc then this needs to be replicated.  This IS NOT part of the schema.  The schema, if you like, is mearly a database definition for Active Directory, it defines all the attibutes etc.  Only if you changes the structure of the schema will it get changed.  This can happen when updating Directory Services in preparation for a new version of Windows i.e. upgrading from Windows 2003 Domain Controllers to Windows 2008 Domain Controllers, or when installing Exchange Server as it needs to add additional non standard attributes to the schema.
0
 
Glen KnightCommented:
The frequency is anything from 15 minutes upwards and this is determined by the site links as you have already found.

Urgent changes (password expires, disabled accounts etc) are replicated almost immediately.
0
 
JorgeSimarroVillarAuthor Commented:
And why the Schema partition replication among domain controllers within the same site (intra-site, I guess) is taking exactly one hour to take place?.
0
Simplify Active Directory Administration

Administration of Active Directory does not have to be hard.  Too often what should be a simple task is made more difficult than it needs to be.The solution?  Hyena from SystemTools Software.  With ease-of-use as well as powerful importing and bulk updating capabilities.

 
TheMakCommented:
It is important to keep in mind that the 15 minutes or less for propagation is theoretical. Because the Active Directory is implemented in large distributed environments, the speed of replication and potential problems remain to be seen.

The Active Directory configures all of this on its own by using the information you enter in the Active Directory Sites and Services. You can manually configure the topology by creating additional connection objects or removing connection objects. The KCC does not delete any manually created connection objects. In the event of replication failure, however, the KCC will create new connection objects so that replication can resume.

In intrasite replication, the Active Directory normally does a good job of automatically generating a replication topology. For intersite replication, you need to take a look at your exiting links and the bandwidth available.

Regards,
0
 
JorgeSimarroVillarAuthor Commented:
Hi TheMak,

Thank you for your post, but you really didn't answered my question.

I'd like to know why the shema  partition replicate every hour. I know you can modify the frequency (http://support.microsoft.com/?scid=kb;en-us;214678&x=11&y=7), but this KB says that the defualt replication is triggered every 5 minutes and the schema partition of my domain is replicated every 1 hour. Even more, the Configuration partition and the Domain partition replicate every 15 minutes and not every 5 minutes as the KB says.

Regards.
0
 
Glen KnightCommented:
replication would only occur if changes are made.
0
 
JorgeSimarroVillarAuthor Commented:
Do you mean that schema replication doesn't happen until a change is made?.

Then, our schem partition hasn't being replciated for months since the last change. It's hard to believe.
0
 
Glen KnightConnect With a Mentor Commented:
Active Directory Replication of ALL partitions only happens if there are changes.
It doesn't replicate nothing.

When do you make schema changes? When you update it for a different version of the schema, for Exchange or different versions of Active Directory Services.
0
 
TheMakCommented:
When an update occurs on a domain controller, the replication engine waits for a configurable interval, which is 5 minutes by default. It then sends a notification message to the first replication partner, informing it of the change. Each additional direct partner is notified after a configurable delay, which is 30 seconds by default. Items that are security-sensitive are immediately replicated and partners are notified immediately. If no changes occur during a configuration period, which is 1 hour by default, a domain controller initiates replication with its replication partners to ensure that no changes from the originating domain controller were missed.

Inter-site Replication

Replication traffic is compressed to save bandwidth.
Replication partners do not notify each other when changes need to be replicated, to save bandwidth.
Replication partners poll each other for changes on a specified polling interval, during scheduled periods only.
Replication uses the TCP/IP or SMTP transport.
Replication connections are only created between bridgehead servers (servers that handles all inter-site replication for that domain). Connections between bridgehead servers using the lowest cost route, according to site link cost. Connections will only be created over higher cost routes if all of the domain controllers in lower cost routes are unreachable.

Regards,
0
 
JorgeSimarroVillarAuthor Commented:
As Microsoft says in the AdPrep documentation:

http://technet.microsoft.com/en-us/library/dd464018(WS.10).aspx

Run the following Repadmin.exe command to ensure that replication is working throughout the forest:

repadmin /replsum /bysrc /bydest /sort:delta

All domain controllers should show 0 in the Fails column, and the largest deltas (which indicate the time that has elapsed since the last successful replication) should be less than or roughly equal to the replication frequency of the site link that the domain controller uses for replication. The default replication frequency is 180 minutes.

This information conflicts with yours.

0
 
Glen KnightCommented:
You are look at an article that is talking about updating the schema, so of course the replication will happen.
Replication does not replicate anything if there is nothing to replicate, it checks for updates but that's as far as it goes, if there are none then it doesn't do anything.

It would be a pointless excercise to replicate the whole partition just for the sake of it.
0
 
TheMakCommented:
Author: And why the Schema partition replication among domain controllers within the same site (intra-site, I guess) is taking exactly one hour to take place?.

Ans: When an update occurs on a domain controller, the replication engine waits for a configurable interval, which is 5 minutes by default. It then sends a notification message to the first replication partner, informing it of the change. Each additional direct partner is notified after a configurable delay, which is 30 seconds by default. Items that are security-sensitive are immediately replicated and partners are notified immediately.

If no changes occur during a configuration period, which is 1 hour by default, a domain controller initiates replication with its replication partners to ensure that no changes from the originating domain controller were missed.
Do you think its not clear?

Regrads,
0
 
JorgeSimarroVillarAuthor Commented:
But the articles ask you for running that command before the schema update.

I'm totally agree with you when saying that it's a pointless exercise, but tools the likes of replmon and repadmin give contradictory information as they say that replication has took place.
0
 
TheMakCommented:
posting the source link below on request,

http://www.networkworld.com/community/node/27680

This was the Author Question: And why the Schema partition replication among domain controllers within the same site (intra-site, I guess) is taking exactly one hour to take place?.

And this is my Answer to the Author Question: If no changes occur during a configuration period, which is 1 hour by default, a domain controller initiates replication with its replication partners to ensure that no changes from the originating domain controller were missed.

I just wanted to know is it clear or not for everyone. Just give me Yes or No.

Regards,
0
 
pubeheedCommented:
Hi,

Are you having problems at present with replication or is this just a query to understand why this happens?

Gareth
0
 
JorgeSimarroVillarAuthor Commented:
That sounds more credible.

In that case, why intra-site schema partition replication is happening every 1 hour and inter-site checking is every fifteen minutes?.

I understand that inter-site schema partition check occurs every 15 minutes as I set that interval in Sites and Services console, but I haven't defined that interval for intra-site. Besides, Why configuration and domain partition check are made every 15 minutes and schema partition is checked every hour?.

Thank you.
0
 
JorgeSimarroVillarAuthor Commented:
No errors at the moment, just want to understand how it works in the case I have problems in the future.
0
 
Glen KnightCommented:
>>Why configuration and domain partition check are made every 15 minutes and schema partition is checked every hour?.
Because the schema partition is changed less.

I think you are reading too much in to these 1 hour and 15 minute values.  Inter-site and intra-site replication is very different.

All you are seeing is CHECKS no replication occurs unless something has changed.
0
 
TheMakCommented:
If no changes occur during a configuration period,  which is 1 hour by default,  After 1 hour a domain controller initiates replication with its replication partners to ensure that no changes from the originating domain controller were missed.

Just have a look to this below article for detail info on intersite replication,

http://www.networkworld.com/community/node/27680

Regards,
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.