Re: How many Global Catalog Servers are needed?
- From: "Miha Pihler [MVP]" <mihap-news@xxxxxxxxxxx>
- Date: Sun, 30 Jul 2006 21:46:38 +0200
Hi,
You should have at least two Global Catalogs (GC) in any production domain.
There is usually no downside to making all your Domain Controllers (DCs)
also a GC. As you figured out, if there are no GCs available users won't be
able to logon to their computers.
On another note naming your domain with .local extension is not recommended.
I hope this helps. Feel free to post back with any additional questions you
might have.
--
Mike
Microsoft MVP - Windows Security
"SEgerton" <SEgerton@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:9ADD66F4-1718-443C-9F59-7A8669ED675B@xxxxxxxxxxxxxxxx
I'm new to Active Directory; and I just started testing a new domain I've
been working on. On one particular test, I started having issues that I
believe are related to Global Catalogs. Let me first give an overview of
the
structure of the domain, and the test that I was trying to perform. Then I
will give the errors that I came across.
I have two offices. Office 1 is our production office. Office 2 is for our
Disaster Recovery. In office 1 we have 3 servers. 2 servers are Active
Directory Domain Controllers, and the third server is a member server used
as
a File Server. Both Domain Controllers are both Active Directory
Integrated
DNS Servers. There is a T1 line that connects both Office1 and Office2. In
Office 2, I have the same setup. I joined the first two servers to the
same
domain in Office 1 as Active Directory Domain Controllers. These two
servers
are also Active Directory Integrated DNS servers. The third server in
Office
2 is also a member server used as a File Server. The File Server in Office
2
is only used at the moment for replication of the File Server in Office 1.
For this we are using a third party replication software. This setup was
put
together this way in the event of a disaster and office 1 goes down, users
can go to Office 2 and work.
Here is the test I tried. I turned off both server 1 and server 2 in
Office
1, hoping that Active Directory would still work because of Server 1 and
Server 2 in Office 2. The redundancy is there for the Domain Controllers
and
for DNS. But after the server were down. I tried logging into the domain
on a
pc as a user, and the logon took a long time. At the same time, he got
into
his profile, but I don't think his Group Policies were in affect. Then I
got
an error. I forget what I was doing to generate it, but here it is.
"A Global Catalog cannot be located to retrieve the icons for the
member list. Some icons may not be shown."
Then in Office 2, I went into Users and Computers on Server 1 and tried to
open a Group Policy Object and got this error.
"Domain controller not found for domain.local" The Domain Controller for
Group Policy operations is not available. You may cancel this operation
for
this session or retry using one of the following Domain Controller
choices.
Here are the choices:
-The one with the Operations Master token for the PDC emulator.
-The one used by the Active Directory Snap-ins.
-Use any available Domain Controller.
OK or Cancel.
I Canceled.
Due to these messages, I believe the problem is due to a Redundancy of
Global Catalog Servers. I don't fully understand them. But my
understanding
is that by default, Global Catalog is installed on the first Domain
Controller of a domain. Therefore I didn't install any additional and only
have one. How many should I have for redundancy?
Thanks in advance.
Shannon
.
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