Re: LdapSrvWeight in Exchange and DR Sites?
- From: rick.kingslan@xxxxxxxxxxxxx
- Date: Sat, 26 Nov 2005 10:49:59 -0800
km,
I'll echo a great deal of what Ace says - a smarter guy on this topic you're not likely to find.
I do agree with your creation of a site for isolating GCs for use by Exchange. So, in that regrard, the priority or the weighting doesn't really play much of a part. By that I mean if you create the site to contain the GCs for lookups and prevening added traffic to those DCs (such as authentication), it will make it easier to track performance of the Exchange architecture, query against the GCs, and to make decisions on when to upgrade. As you well know, capacity planning in an Exchange environment is hugely important to sustained health.
---
Rick [msft]
This posting is provided "AS IS" with no warranties, and confers no rights.
-----Original Message-----
From: km
Posted At: Thursday, November 24, 2005 3:46 PM
Posted To: microsoft.public.windows.server.dns
Conversation: LdapSrvWeight in Exchange and DR Sites?
Subject: Re: LdapSrvWeight in Exchange and DR Sites?
I am referring to an Exchange site in AD...The creation of an Exchange site was recommended by Microsoft during our yearly "Exchange health check."
If the weight is not considered- why was it mentioned in the technet document I linked above?
I was confused about the necessity as well...
The concepts of sites in AD works- but it does not isolate traffic to/from particular DCs. We have DCs in a DR site with a priority of 2- and clients still authenticate against them.
THat being the case, we would like to remove any client traffic to/from the DCS in 1) Exchange AD site and 2) our DR site. OUr users should only authenticate with the DCs in the datacenter. Exchange should only use the DC/GCs in the AD Exchange site for Directory Access.
"Ace Fekay [MVP]" wrote:
> In news:D0EEDBEE-BE76-48C6-BDDB-A954DBFCD8D6@xxxxxxxxxxxxx,
> km <km@xxxxxxxxxxxxxxxxxxxxxxxxx> made this post, which I then
> commented about below:
> > So if I understand this correctly, my topology should be as follows:
> >
> > two sites- Datacenter and Exchange
> > two DCs/GCs in each site
> > Datacenter site has DCs with priority of 0 and weight of 50 Exchange
> > site has DCs with priority of 1 and weight of 100
> >
> > This will cause clients to ignore Exchange sites to authentication,
> > and Exchange to send DA requests to the DCs in it's own site at a
> > 2:1 ratio compared to the Datacenter site?
>
> First, there is no "Exchange Sites", unless you are using Exchange 55,
> but that isn't the case here. Exchang uses Routing Groups (formerly
> Exchange 55
> sites) and are just used to control how mail flows thru an
> organization, or in a design consideration when attempting to control
> who can access Public Folders, etc.
>
> Honestly if you have Active Directory Sites setup properly in AD Sites
> and Services with the correct subnet objects created and associated
> with the AD SItes you created, there is really no need to do this.
> This is more for controlling traffic to where they are going to go
> between specific DCs in one AD Site. If you have ALL of your DCs in
> one site with weights set to 50, then they will equally be used by
> Exchange at any given time, just as if you were to have left it alone in it's default configuration.
>
> Exchange is fully AD Site aware and will utilize that when choosing
> which Site in selecting which DC/GC to use. Make sense?
>
> Otherwise, maybe you may want to elaborate a bit more as to what you
> are trying to accomplish that simply creating an AD Site will not take
> care of by default?
>
> Ace
>
>
>
.
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