RE: [ActiveDir] AD synchronization

[Linton Smith (WBTQ)]

Title: Message

Hi Marc,   I think you have it backwards.  A GC will have a larger DIT because a GC is also a DC.  The DC will have all objects in the domain.  The GC (because it is also a DC) will also have all objects in the domain, plus a subset of objects and attributes from other domains.  If you are seeing the same size on every DC/GC, it's likely because all your DCs are also GCs, or there are no other domains in your forest.   HTH,   Linton -----Original Message----- From: Marc Zukerman [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 26, 2003 9:58 AM To: [EMAIL PROTECTED] Subject: Re: [ActiveDir] AD synchronization Now that's interesting Roger. I never thought to check it, but at my current client, the ntds.dit file does NOT change between GCs and DCs. For a directory of roughly 8500 objects we are at 250MB for all domain controllers, whether or not they are a DC. This environment is a single domain with Exchange 2000 (although only a very small subset of the users have Exchange - that's the project we're doing).   Also, I've always assumed that the GC was smaller than the DC because it is merely a subset. A large one, but a subset nonetheless.   Anyone with comments?   Marc Zukerman Senior Network Engineer Greenwich Technology Partners ----- Original Message ----- From: Roger Seielstad To: '[EMAIL PROTECTED]' Sent: Wednesday, March 26, 2003 7:30 AM Subject: RE: [ActiveDir] AD synchronization That's a tough one. Its going to depend on the number of domains and the number of objects in each domain.   We're using an empty root with a single 'production' domain below it, probably 2500 objects in the production domain.   Looking at two root DCs, one which is and one which isn't a GC, the sizes of NTDS.DIT are significantly different: With GC: 79MB Without: 27MB   So, roughly speaking, that's about 50MB for a GC replication of around 2500 objects. Of course, your mileage will vary quite a bit.  So, in my case, a full GC replication is going to be about 50MB to 12 servers, which my WAN can handle without issue - most WAN's could probably handle that.   Roger -------------------------------------------------------------- Roger D. Seielstad - MCSE Sr. Systems Administrator Inovis Inc. -----Original Message----- From: Don Murawski (Lenox) [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 26, 2003 7:02 AM To: '[EMAIL PROTECTED]' Subject: RE: [ActiveDir] AD synchronization How "big" is the GC synch compared to the full AD synch? -----Original Message----- From: Marc Zukerman [mailto:[EMAIL PROTECTED] Sent: Tuesday, March 25, 2003 2:29 PM To: [EMAIL PROTECTED] Subject: Re: [ActiveDir] AD synchronization Yes. Any schema modification requires a full directory synchronization. Since the schema is forest-wide, this means it affects all whether there is a dedicated forest root or not. In addition, the first Exchange 2000 system forces a global catalog full synchronization. When I questioned the Microsoft developer at MEC '99 why it was necessary to replicate the GC completely, I didn't get a satisfactory answer as to why. If anyone out there can tell me, I'd love to know why. We all determined it would be best to handle the forestprep and initial server installation off hours and from the Schema FSMO for any environment that was sizeable.   Marc Zukerman Senior Network Engineer Greenwich Technology Partners ----- Original Message ----- From: Don Murawski (Lenox) To: '[EMAIL PROTECTED]' Sent: Tuesday, March 25, 2003 2:09 PM Subject: RE: [ActiveDir] AD synchronization Does Forest prep cause a full synchronization? We have an empty root domain that contains the schema master.   -----Original Message----- From: Marc Zukerman [mailto:[EMAIL PROTECTED] Sent: Tuesday, March 25, 2003 12:22 PM To: [EMAIL PROTECTED] Subject: Re: [ActiveDir] AD synchronization Even so, I wouldn't chance it. If you have any corruptions to the schema when it gets updated, it is much more difficult to deal with that at 2:00pm on a Wednesday. I'd shoot for Friday night to be safe.   Marc Zukerman Senior Network Engineer Greenwich Technology Partners ----- Original Message ----- From: Kevin Miller To: [EMAIL PROTECTED] Sent: Tuesday, March 25, 2003 11:57 AM Subject: RE: [ActiveDir] AD synchronization How big is the AD implementation and how big are the pipes? I ran forest prep here in the middle of that day with 30 DC's and 10,000 AD objects not a problem at all. 768 CIR lines between servers.   -- Kevinm WLKMMAS, Exchange MVP From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Marc Zukerman Sent: Tuesday, March 25, 2003 8:42 AM To: [EMAIL PROTECTED]   If you have not run forestprep yet, it will update the schema. This will force a full synchronication of the directory and global catalog. This may be a concern.   Marc Zukerman Senior Network Engineer Greenwich Technology Partners ----- Original Message ----- From: Don Murawski (Lenox) To: [EMAIL PROTECTED] Sent: Tuesday, March 25, 2003 10:42 AM Subject: [ActiveDir] AD synchronization   We are bring up one E2k server  this weekend,  the exchange group is concerned the AD synchronization will impact Active Directory to a point that service is crippled. What are the major impacts?   Thanks,   Don L. Murawski Sr. Network Administrator WorldTravel BTI Phone: (404) 923-9468 Fax:     (404) 949-6710 Cell:     (678) 549-1264

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