RE: Question concerning Exchange 2003 and the Global Catalog
- From: "Chad Roush" <croush@xxxxxxxxxxx>
- To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
- Date: Thu, 2 Oct 2003 16:44:15 -0500
John,
Thanks for your input, can you elaborate on some of the downfalls of a
2nd GC?
During the failure because I had a 2nd DC running, but no GC on that
server my users were still able to log onto the network and carry out
their work with the exeception of not being able to log onto the
Exchange server. As far as my network is concerned, I don't am lacking
the machines and licences to setup additional servers so it would seem
that what I have done would be a sound configuration as it would be a
bad practice to only have 1 DC on my network. If Exchange truly only
uses the copy of the GC that resides on itself, at least if the other DC
goes down I still have access to my Exchange Server. My guess is that
if the GC on the Exchange is down the whole server would be down anyway.
At least now I can maybe eliminate the domino effect.
I do remember seeing docs that suggested NOT running the GC on an
Exchange 2000 server, but I haven't been able to locate anything on
Exchange 2003. My question about that is how are all the SBS servers
running their GC? I have also found notes indicating that in a singe
domain enviroment that it is possible to run without a GC at all,
although I'm sure that is not the case if you are running an Exchange
2000/2003 Server.
From what you are saying about Windows Server 2003, that would at least
allow me to remove the 2nd copy of the GC that is running on the
Exchange Server. I do look forward to rolling out this upgrade too.
Thanks,
Chad
-----Original Message-----
From: John Tolmachoff (Lists) [mailto:johnlist@xxxxxxxxxxxxxxxxxxx]
Sent: Thursday, October 02, 2003 4:07 PM
To: [ExchangeList]
Subject: [exchangelist] RE: Question concerning Exchange 2003 and the
Global Catalog
http://www.MSExchange.org/
Problem: Exchange on a DC. Exchange will only use that DC. (This is true
for E2K, not sure if it is changed for E2K3.)
Problem: More than one GC in a domain in the same location. While you
experienced the one benefit to having more than one GC per
domain/location, there are a number of downfalls.
Problem: User can not access if no GC available. Windows 2003 Server AD
helps this, that once a user logs on the first time, the other DC will
cache the group credentials, and if during a log on can not contact the
GC, will use the cache. (I think I explained that correctly.)
Did that help, or make it more confusing?
John Tolmachoff MCSE CSSA
Engineer/Consultant
eServices For You
www.eservicesforyou.com
> -----Original Message-----
> From: Chad Roush [mailto:croush@xxxxxxxxxxx]
> Sent: Thursday, October 02, 2003 1:54 PM
> To: [ExchangeList]
> Subject: [exchangelist] Question concerning Exchange 2003 and the
> Global Catalog
>
> http://www.MSExchange.org/
>
> I would like some advice, I am wrapping up my Exchange 5.5 to Exchange
> 2003 upgrade at this time.
>
> Here is my current configuration
>
> Server1 - W2K DC running DNS, DHCP, Wins currently the operations
> master server GC, PDC emulator, etc.
>
> Server2 - W2K DC running DNS, WINS, Exchange 2003
>
> Server3 - W2K server running ISA server
>
> While moving my mailboxes we had a problem with Server1 and were down
> for a few hours waiting for parts to arrive. Since server1 was running
> the global catalog the users who were moved to the Exchange 2003
> server were unable to access the new Exchange server. Now that we have
> repaired server1 I want to make sure that one server being down does
> not shut down access to the other servers. To help resolve the Global
> Catalog issue, I have enabled the global catalog on server2 also.
> Now in theory if server1 is down, my Exchange clients should be able
to
> fail over to the second GC.
>
> Am I thinking correctly? Any other suggestions to help make these
> systems more fault tollerent?
>
> Thanks,
>
> Chad
>
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