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Got it, thanks. Hey Don, has this discussion helped
at all???
Marc Zukerman
Senior Network Engineer
Greenwich Technology Partners
----- Original Message -----
Sent: Wednesday, March 26, 2003 12:31
PM
Subject: RE: [ActiveDir] AD
synchronization
Because the Global Catalog data is already present in the .DIT file for
the domain for which the server is a DC. Its in effect single instance storage
- its not going to duplicate the data that's already
there.
--------------------------------------------------------------
Roger D. Seielstad
- MCSE
Sr. Systems Administrator
Inovis Inc.
OK, that makes sense and is consistent with
everything else. That actually goes back to another conversation a few weeks
ago when someone was asking about the true advantages/disadvantages of a
dedicated forest root vs. single domain. The single domain would have a
smaller GC (only one to manage).
One thing it doesn't answer is why the size of
the dit file doesn't change if a system is not a GC. In one case, a system
was temporarily made a GC and then "demoted" again to just a DC. However
there are other DCs that were never GCs at any time. Every one of them is
approximately 250MB (within 2 MB in either direction depending on the
DC).
Marc Zukerman
Senior Network Engineer
Greenwich Technology Partners
----- Original Message -----
Sent: Wednesday, March 26, 2003 10:17
AM
Subject: RE: [ActiveDir] AD
synchronization
Since you are one
domain the sizes should be the same. The GC contains the partial attribute
set from all domains in the forest. Since you only have one domain you
don't have anything additional added. Also, yes the GC is a subset of all
attributes for the domains which the DC is not a member. So again, since
you are a single domain nothing is added. Also the NTDS.dit contains all
naming contexts, Domain, Configuration, Schema... so within the dit for
the DC there will be domain naming contexts for all domains in the forest.
Other than the domain which the DC is representing the DC only have
partial information for all objects in the other
domains.
Even though only
some of the users are on Exchange 2000, the definition of the user objects
come from the schema which define exchange attributes. There are no values
for the attributes but the user objects have those attributes present
(Speaking of mail enabled users).
In a multiple
domain forest the GCs will be larger because they have all of their own
info as well as some info from all other domains...
Hth,
Kevin
Sullivan
Sales
Engineer
Aelita
Software
-----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.
Greenwich
Technology Partners
----- Original
Message -----
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:
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 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.
Greenwich
Technology Partners
-----
Original Message -----
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.
Greenwich Technology
Partners
-----
Original Message -----
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.
Greenwich
Technology Partners
----- Original
Message -----
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?
Don
L. Murawski
Sr.
Network Administrator
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WorldTravel
BTI
Phone:
(404) 923-9468
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(404) 949-6710
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(678) 549-1264
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